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Neurological Surgeon, Surgical Specialist
6 years of experience

Education ?

Medical School Score
Upstate Medical University Physical Medicine and Rehabilitation (2004)
  • Currently 2 of 4 apples

Awards & Distinctions ?

Associations
Congress of Neurological Surgeons

Publications & Research

Dr. Owen has contributed to 34 publications.
Title Characterization of Tissue Biomechanics and Mechanical Signaling in Uterine Leiomyoma.
Date May 2012
Journal Matrix Biology : Journal of the International Society for Matrix Biology
Excerpt

Leiomyoma are common tumors arising within the uterus that feature excessive deposition of a stiff, disordered extracellular matrix (ECM). Mechanical stress is a critical determinant of excessive ECM deposition and increased mechanical stress has been shown to be involved in tumorigenesis. Here we tested the viscoelastic properties of leiomyoma and characterized dynamic and static mechanical signaling in leiomyoma cells using three approaches, including measurement of active RhoA. We found that the peak strain and pseudo-dynamic modulus of leiomyoma tissue was significantly increased relative to matched myometrium. In addition, leiomyoma cells demonstrated an attenuated response to applied cyclic uniaxial strain and to variation in substrate stiffness, relative to myometrial cells. However, on a flexible pronectin-coated silicone substrate, basal levels and lysophosphatidic acid-stimulated levels of activated RhoA were similar between leiomyoma and myometrial cells. In contrast, leiomyoma cells plated on a rigid polystyrene substrate had elevated levels of active RhoA, compared to myometrial cells. The results indicate that viscoelastic properties of the ECM of leiomyoma contribute significantly to the tumor's inherent stiffness and that leiomyoma cells have an attenuated sensitivity to mechanical cues. The findings suggest there may be a fundamental alteration in the communication between the external mechanical environment (extracellular forces) and reorganization of the actin cytoskeleton mediated by RhoA in leiomyoma cells. Additional research will be needed to elucidate the mechanism(s) responsible for the attenuated mechanical signaling in leiomyoma cells.

Title Early Optical Detection of Cerebral Edema in Vivo.
Date March 2011
Journal Journal of Neurosurgery
Excerpt

Cerebral edema is a significant cause of morbidity and mortality in diverse disease states. Currently, the means to detect progressive cerebral edema in vivo includes the use of intracranial pressure (ICP) monitors and/or serial radiological studies. However, ICP measurements exhibit a high degree of variability, and ICP monitors detect edema only after it becomes sufficient to significantly raise ICP. The authors report the development of 2 distinct minimally invasive fiberoptic near-infrared (NIR) techniques able to directly detect early cerebral edema.

Title Cocaine-induced Midline Destructive Lesion.
Date March 2010
Journal Clinical and Experimental Dermatology
Title Hippocampus Minor, Calcar Avis, and the Huxley-owen Debate.
Date February 2010
Journal Neurosurgery
Excerpt

On the bicentennial of Darwin's birth, we describe the origin of the calcar avis and summarize the debate around this structure, which played a central role in the evolution debate in the mid-19th century. We performed a comprehensive review of relevant neuroanatomic literature, bibliographic sources, and 19th century primary sources. Once known as the hippocampus minor, the structure now known as the calcar avis is an involution of the ventricular wall produced by the calcarine fissure. A heated debate raged between 2 prominent scientific theorists, Sir Richard Owen and Thomas Henry Huxley, over the presence of the hippocampus minor in apes versus humans. Owen put forward the lack of an identifiable hippocampus minor in humans as part of an attempt to debunk evolution. A bitter personal and academic rivalry ensued, as Huxley conducted his own dissections to refute Owen's claims. Huxley ultimately dismantled Owen's premises, securing the epithet "Darwin's bulldog" for his defense of the theory of evolution. Thus, this relatively obscure neuroanatomic landmark served as a pivotal point of contention in the most popularized and acrimonious evolutionary debate of the 19th century.

Title Imprinting Disorders and Assisted Reproductive Technology.
Date October 2009
Journal Seminars in Reproductive Medicine
Excerpt

Worldwide use of assisted reproductive technology (ART) accounts for an estimated 1 to 3% of births. Since 2002, a series of reports have suggested an increased risk of imprinting disorders (Beckwith-Wiedemann syndrome and Angelman syndrome) in children conceived by ART. Definitive conclusions are difficult to substantiate due to the rarity of imprinting disorders and the variability in ART protocols. Despite these limitations, there is biological plausibility for alteration in nongenomic inheritance caused by ART. Animal studies have shown that ART procedures can alter normal imprinting, specifically DNA methylation patterns. Collectively, studies suggest an association between ART and loss of maternal methylation. More recent reports examined a possible association between ART and global hypomethylation of DNA. Three other imprinting disorders (Silver-Russell syndrome, maternal hypomethylation syndrome, and retinoblastoma) have also been implicated, but there is insufficient evidence to establish an association of these syndromes with ART. Based on current evidence, the absolute risk of imprinting disorders after ART remains small and does not warrant routine screening. Large prospective studies are needed to better understand the risks associated with imprinting disorders, imprinting defects, and ART.

Title Isolated Amygdala Neurocysticercosis in a Patient Presenting with Déjà Vu and Olfactory Auras. Case Report.
Date July 2009
Journal Journal of Neurosurgery. Pediatrics
Excerpt

Neurocysticercosis is the most common parasitic infection in the CNS and a leading cause of epilepsy. Since it is a circumscribed lesional cause of epilepsy, specific locations of neurocysticercal lesions may lead to specific clinical presentations. The authors describe a 17-year-old Hispanic boy who had a single enhancing bilobar mass in the right amygdala. Initially, the patient presented with secondarily generalized tonic-clonic seizures, which resolved with antiepilepsy drug therapy. On further investigation, he was found to have persistent olfactory and déjà vu auras. A right amygdalectomy without hippocampectomy was performed, and both the seizures and auras immediately resolved. Pathological analysis revealed neurocysticercosis. To the authors' knowledge, this case is the first reported instance of 2 distinct mesial temporal aura semiologies associated with localized neurocysticercosis in the amygdala and successfully treated with resection. Uniquely, the case demonstrates that both olfactory and déjà vu auras can emanate from the amygdala.

Title Frame-based Stereotaxy in a Frameless Era: Current Capabilities, Relative Role, and the Positive- and Negative Predictive Values of Blood Through the Needle.
Date July 2009
Journal Journal of Neuro-oncology
Excerpt

In the modern era of frameless stereotaxis (FL), the role of frame-based (FB) stereotactic needle biopsy is evolving.

Title The Madness of Dionysus: a Neurosurgical Perspective on Friedrich Nietzsche.
Date November 2007
Journal Neurosurgery
Excerpt

OBJECTIVE: To examine the possibility that an intracranial mass may have been the etiology of the headaches and neurological findings of the philosopher Friedrich Nietzsche (1844-1900) and the cause of his ultimate mental collapse in 1889. METHODS: The authors conducted a comprehensive English and German language literature search on the topic of Nietzsche's health and illness, examining Nietzsche's own writings, medical notes from his physicians, contemporary medical literature, biographical texts, and past attempts at pathography. We also examined archived portraits and engravings of the philosopher from 1864 onward. An English language search in the modern literature on the topic of psychiatric presentations of intracranial mass lesions was also conducted. RESULTS: From his late 20s onward, Nietzsche experienced severe, generally right-sided headaches. He concurrently suffered a progressive loss of vision in his right eye and developed cranial nerve findings that were documented on neurological examinations in addition to a disconjugate gaze evident in photographs. His neurological findings are consistent with a right-sided frontotemporal mass. In 1889, Nietzsche also developed a new-onset mania which was followed by a dense abulia, also consistent with a large frontal tumor. CONCLUSION: A close examination of Nietzsche's symptomatic progression and neurological signs reveals a clinical course consistent with a large, slow growing, right-sided cranial base lesion, such as a medial sphenoid wing meningioma. Aspects of his presentation seem to directly contradict the diagnosis of syphilis, which has been the standard explanation of Nietzsche's madness. The meningioma hypothesis is difficult, though not impossible, to prove; imaging studies of Nietzsche's remains could reveal the bony sequelae of such a lesion.

Title Postinflammatory Hyperpigmentation in an Asian Patient: a Dramatic Response to Oral Isotretinoin (13-cis-retinoic Acid).
Date June 2005
Journal The British Journal of Dermatology
Title Streptococcal Infection May Make Psoriasis Worse but Do Antibiotics Help?
Date October 2004
Journal The British Journal of Dermatology
Title Genital Lichen Sclerosus Associated with Incontinence.
Date April 2003
Journal Journal of Obstetrics and Gynaecology : the Journal of the Institute of Obstetrics and Gynaecology
Title Development of a Continuous Respiration Olfactometer for Odorant Delivery Synchronous with Natural Respiration During Recordings of Brain Electrical Activity.
Date September 2002
Journal Ieee Transactions on Bio-medical Engineering
Excerpt

The continuous respiration olfactometer (CRO) was designed as a respiration-synchronous method for delivering odorants during recordings of brain electrical activity, providing control and monitoring of the timing of the delivery as well as the quantities of odorant involved. The CRO incorporates a purpose-built electronic system designed with very specific temporal and quantitative characteristics, and is composed of four main parts: the respiratory monitoring apparatus, the odorant/air delivery system, the serial interface device and the respiratory monitoring software. Tests were undertaken to determine the performance of the system with reference to the accuracy and precision of timing and control of odorant delivery. Tests were also undertaken to determine the effects of variations in natural respiration between subjects on the capability of the respiratory monitoring system, using a group of 50 subjects, to test the success of a variable gain control to optimize the range of the digitized respiratory output. The delivery system was able to provide information concerning quantities of air or odorant delivered, and the stimulus timing information required for integration with neurophysiological recording techniques.

Title Cutaneous T-cell Lymphoma Developing in a Patient on Cyclosporin Therapy.
Date August 2002
Journal Journal of the American Academy of Dermatology
Excerpt

The use of cyclosporin in the transplant setting is associated with a small but significantly increased risk of the development of lymphoproliferative disorders. These are predominantly but not always related to Epstein-Barr virus (EBV) infection. We report a cutaneous CD30(+) T-cell lymphoma in a patient with atopic eczema during low-dose cyclosporin monotherapy. There was no evidence of EBV DNA transcripts in the tumor tissue as assessed by in situ hybridization. The tumors resolved when cyclosporin therapy was stopped and have not recurred. There are a few reports of primary cutaneous lymphoma in transplant patients. This is the first report to our knowledge of cutaneous lymphoma in a patient treated with low-dose cyclosporin monotherapy. Although this finding may be coincidental, we believe this case highlights the small lymphoproliferative risk associated with cyclosporin.

Title A Systematic Review of Antistreptococcal Interventions for Guttate and Chronic Plaque Psoriasis.
Date March 2002
Journal The British Journal of Dermatology
Excerpt

BACKGROUND: Guttate psoriasis is closely associated with preceding or concurrent streptococcal infection. Some authorities have claimed that chronic plaque psoriasis may also be made worse by infection. In view of this many dermatologists have recommended using antibiotics for psoriasis, particularly guttate type. Some dermatologists have also recommended tonsillectomy for psoriasis in patients with recurrent streptococcal pharyngitis. OBJECTIVES: This review aims to assess the evidence for the effectiveness of antistreptococcal interventions, including antibiotics and tonsillectomy in the management of acute guttate and chronic plaque psoriasis. METHODS: Studies were identified by searching the Cochrane Clinical Trials Register (Cochrane Library, Issue 3, 1999), Medline (1966-September 1999), Embase (1988-September 1999), the Salford Database of Psoriasis Trials (to November 1999) and the European Dermato-Epidemiology Network (EDEN) Psoriasis Trials Database (to November 1999) for terms (STREPTOCOCC* or ANTIBIOTIC* or TONSIL*) and PSORIASIS using the Cochrane Skin Group search strategy. RESULTS: Only one trial met the selection criteria. This compared the use of two oral antibiotic schedules in 20 psoriasis patients, predominantly of guttate type, who had evidence of beta-haemolytic streptococcal colonization. Either rifampicin or placebo was added to the end of a standard course of phenoxymethylpenicillin or erythromycin. No patient in either arm of the study improved during the observation period. No randomized trials of tonsillectomy for psoriasis were identified. CONCLUSIONS: Although both antibiotics and tonsillectomy have frequently been advocated both for patients with guttate psoriasis and for selected patients with chronic plaque psoriasis, there is to date no good evidence that either intervention is beneficial.

Title A Systematic Review of Treatments for Guttate Psoriasis.
Date March 2002
Journal The British Journal of Dermatology
Excerpt

BACKGROUND: Many different therapies are available for treating guttate psoriasis; however, there appears to be little objective evidence for their efficacy OBJECTIVES: This review aims to assess the evidence for the effectiveness of treatments for guttate psoriasis. Antistreptococcal interventions for guttate psoriasis are addressed in a separate review. METHODS: Studies were identified by searching the Cochrane Clinical Trials Register (Cochrane Library, Issue 3, 1999), Medline (1966-September 1999), Embase (1988-September 1999), Salford Database of Psoriasis Trials (to November 1999) and the European Dermato-Epidemiology Network (EDEN) Psoriasis Trials Database (to November 1999) for terms GUTTATE and PSORIASIS. We also searched 100 unselected randomized controlled trials of psoriasis therapy and all 112 randomized controlled trials of phototherapy for psoriasis in the Salford Database of Psoriasis Trials for separate stratification of guttate psoriasis. RESULTS: No published report could be found to support or to challenge current commonly used methods of management. Only one trial that met the selection criteria was identified. In this small study of 21 hospitalized patients with guttate psoriasis, intravenous infusion of an n-3 fatty acid rich lipid emulsion was compared with placebo emulsion containing n-6 fatty acids. The n-3 preparation appeared to be of some benefit for patients with guttate psoriasis. CONCLUSION: There is currently no firm evidence on which to base treatment of acute guttate psoriasis. Studies comparing standard treatment modalities, including phototherapy and topical regimens, are required to enable informed decisions on treatment choices to be made.

Title Occupational Allergic Contact Dermatitis from Phenol-formaldehyde Resins.
Date December 2001
Journal Contact Dermatitis
Title Tissue-engineered Dermal Skin Grafting in the Treatment of Ulcerated Necrobiosis Lipoidica.
Date May 2001
Journal Clinical and Experimental Dermatology
Excerpt

Necrobiosis lipoidica is a well recognized but comparatively rare cutaneous complication of diabetes mellitus. The aetiology is probably multifactorial with microangiopathy, immune complex formation, abnormal collagen synthesis and breakdown, and altered haemostasis all thought to play a part. Necrobiosis lipoidica often proves very resistant to treatment. We report a case of a 44-year-old woman with ulcerated necrobiosis lipoidica that healed following grafting with a tissue-engineered living dermal tissue.

Title Contact Allergy to Oak Moss Resin in a Soluble Oil.
Date January 2001
Journal Contact Dermatitis
Title Multicenter Investigation of 1,036 Subjects Using a Standardized Method for the Assessment of Olfactory Function Combining Tests of Odor Identification, Odor Discrimination, and Olfactory Thresholds.
Date October 2000
Journal European Archives of Oto-rhino-laryngology : Official Journal of the European Federation of Oto-rhino-laryngological Societies (eufos) : Affiliated with the German Society for Oto-rhino-laryngology - Head and Neck Surgery
Excerpt

"Sniffin' Sticks" is a test of nasal chemosensory performance that is based on penlike odor-dispensing devices. It is comprised of three tests of olfactory function: tests for odor threshold, discrimination and identification. Previous work has already established its test-retest reliability and validity in comparison to established measures of olfactory sensitivity. The results of this test are presented as a composite TDI score--i.e., the sum of results obtained for threshold, discrimination and identification measures. The present multicenter investigation aimed at providing normative values in relation to different age groups. To this end, 966 patients were investigated in 11 centers. An additional study tried to establish values for the identification of anosmic patients, with 70 anosmics investigated in five specialized centers where the presence of anosmia was confirmed by means of olfactory evoked potentials. For healthy subjects, the TDI score at the 10th percentile was 24.5 in subjects younger than 15 years, 30.3 for ages from 16 to 35 years, 28.8 for ages from 36 to 55 years and 27.5 for subjects older than 55 years. While these data can be used to estimate individual olfactory abilities in relation to a subject's age, hyposmia was defined as the 10th percentile score of 16- to 35-year-old subjects. Our latter study revealed that none of 70 anosmics reached a TDI score higher than 15. This score of 15 is regarded as the cut-off value for functional anosmia. These results provide the basis for the routine clinical evaluation of patients with olfactory disorders using "Sniffin' Sticks."

Title Interventions for Guttate Psoriasis.
Date July 2000
Journal Cochrane Database of Systematic Reviews (online)
Excerpt

BACKGROUND: Guttate psoriasis is a distinctive acute form of psoriasis which characteristically occurs in children and young adults. Very little specific evidence-based guidance is available in standard texts to help make rational decisions about treatment options. OBJECTIVES: To assess the effectiveness of treatments for guttate psoriasis. SEARCH STRATEGY: We searched the Cochrane Clinical Trials Register (Cochrane Library, Issue 3, 1999), Medline (1966- September 1999), Embase (1988-September 1999), Salford Database of Psoriasis Trials (to November 1999) and European Dermato-Epidemiology Network (EDEN) Psoriasis Trials Database (to November 1999) for terms GUTTATE and PSORIASIS. We also searched 100 unselected RCTs of psoriasis therapy and all 112 RCTs of phototherapy for psoriasis in the Salford Database of Psoriasis Trials for separate stratification for guttate psoriasis. SELECTION CRITERIA: Randomised trials in which patients with acute guttate psoriasis were randomised to different treatments, except those trials examining antistreptococcal interventions which are addressed in a separate Cochrane review. DATA COLLECTION AND ANALYSIS: Two reviewers independently assessed trial eligibility and quality. MAIN RESULTS: No published report could be found to support or to challenge current commonly used methods of management. Only one trial which met the selection criteria was identified. In this small study of 21 hospitalised patients with guttate psoriasis, intravenous infusion of an n-3 fatty acid rich lipid emulsion was compared with placebo emulsion containing n-6 fatty acids. The n-3 preparation appeared to be of some benefit for patients with guttate psoriasis. REVIEWER'S CONCLUSIONS: There is currently no firm evidence on which to base treatment of acute guttate psoriasis. Studies comparing standard treatment modalities, including phototherapy and topical regimens, are required to enable informed decisions on treatment choices to be made.

Title Antistreptococcal Interventions for Guttate and Chronic Plaque Psoriasis.
Date July 2000
Journal Cochrane Database of Systematic Reviews (online)
Excerpt

BACKGROUND: Guttate psoriasis is a distinctive acute form of psoriasis which characteristically occurs in children and young adults. It is closely associated with preceding streptococcal sore throat or tonsillitis. Some authorities have claimed that ordinary (chronic plaque) psoriasis may also be made worse by infection at distant sites. Although many dermatologists have recommended using antibiotics for guttate psoriasis in particular, it is not clear whether they influence the course of either form of psoriasis. Some dermatologists have also recommended tonsillectomy for psoriasis in patients with recurrent streptococcal sore throat. OBJECTIVES: To assess the evidence for effectiveness of antistreptococcal interventions including antibiotics and tonsillectomy in the management of acute guttate and chronic plaque psoriasis. SEARCH STRATEGY: We searched the Cochrane Clinical Trials Register (Cochrane Library, Issue 3, 1999), Medline (1966- September 1999), Embase (1988-September 1999), the Salford Database of Psoriasis Trials (to November 1999) and the European Dermato-Epidemiology Network (EDEN) Psoriasis Trials Database (to November 1999) for terms [STREPTOCOCC* or ANTIBIOTIC* or TONSIL*] and PSORIASIS using the Cochrane Skin Group search strategy. SELECTION CRITERIA: Randomised trials of one or more antistreptococcal interventions in patients with guttate or chronic plaque psoriasis. DATA COLLECTION AND ANALYSIS: Two reviewers independently examined each retrieved trial for eligibility and quality. MAIN RESULTS: The one eligible trial we identified compared the use of two oral antibiotic schedules in 20 psoriasis patients, predominantly of guttate type, who had evidence of beta-haemolytic streptococcal colonisation. Either rifampicin or placebo was added to the end of a standard course of antistreptococcal antibiotic (phenoxymethylpenicillin or erythromycin). No patient in either arm of the study improved during the observation period. No randomised trials of tonsillectomy for psoriasis were identified. REVIEWER'S CONCLUSIONS: Although it is well known that guttate psoriasis may be precipitated by streptococcal infection, there is no firm evidence to support the use of antibiotics either in the management of established guttate psoriasis or in preventing the development of guttate psoriasis following streptococcal sore throat. Although both antibiotics and tonsillectomy have frequently been advocated for patients with recurrent guttate psoriasis or chronic plaque psoriasis, there is to date no good evidence that either intervention is beneficial.

Title Successful Treatment of Severe Psoriasis with Basiliximab, an Interleukin-2 Receptor Monoclonal Antibody.
Date July 2000
Journal Clinical and Experimental Dermatology
Excerpt

T-cell mediated inflammation plays an important role in the aetiology of psoriasis. We describe a case of severe recalcitrant psoriasis responding well to combined cyclosporin and basiliximab (Simulect(R) Novartis Pharmaceuticals UK Ltd), an interleukin-2 receptor (IL-2R; CD25) chimeric monoclonal antibody.

Title Two Cases of Primary Hyperparathyroidism Associated with Primary Cutaneous Lymphoma.
Date May 2000
Journal The British Journal of Dermatology
Excerpt

Primary hyperparathyroidism has been described previously in association with malignancy, but to our knowledge has not been reported in association with primary cutaneous lymphoma. We report two cases of parathyroid adenoma with primary cutaneous lymphoma, the first in a 42-year-old woman with CD30-negative cutaneous large cell lymphoma, and the second in a 67-year-old man with mycosis fungoides and CD30-positive anaplastic large cell lymphoma.

Title Occupational Dermatitis in Sheffield: a Preliminary Study.
Date June 1999
Journal Contact Dermatitis
Title Steady State Visual Evoked Potential (ssvep) Changes in Response to Olfactory Stimulation.
Date February 1999
Journal Annals of the New York Academy of Sciences
Excerpt

The location, nature and characteristics of brain activity during detection and identification of odors are of importance if brain function techniques are to be of value to sensory systems. Steady state probe topography (SSPT) has been used in our laboratory to record steady state visual evoked potentials (SSVEP), which have demonstrated cognitive task-related changes in a variety of testing paradigms. The enhanced spatial (when using 64 channels) and temporal resolution (380 ms) of the system enable the brain electrical activity changes occurring before, during and after delivery of an odor to be examined. We have developed a system which can deliver odors during normal respiration and the accurate timing needed for SSVEP recordings. The system is based on the premise that a subject breathing butanol compared with filtered medical air will demonstrate SSVEP topographic changes associated with detection and identification of butanol. During our experiments the subject has either an air sample or an equal volume of butanol injected into the inspiratory airflow. These are randomized, and every breath has the same stimulus system with no known clues as to the differences apart from detection. The results from a panel of 10 female subjects--who all identified the butanol correctly--showed that butanol delivery resulted in sequences of changes in SSVEP topography (amplitude and latencies) which involved parietal, frontal and temporal regions. While consistent with other studies (parietal changes), our results revealed more dynamic temporal changes involving prefrontal and parietal regions at different periods around odor delivery.

Title Too Much Nit-picking?
Date July 1982
Journal Nursing Times
Title How Surrey Implemented the Court Report.
Date July 1982
Journal Nursing Times
Title Child Health Record Booklet.
Date August 1980
Journal Midwife, Health Visitor & Community Nurse
Title Health Surveillance Programme for Children 0-5 Years.
Date May 1980
Journal Health Visitor
Title Bridging the Information Gap.
Date August 1979
Journal Nursing Mirror
Title Intercultural Views on American Consultation in Japanese Occupational Therapy Schools.
Date October 1977
Journal The American Journal of Occupational Therapy. : Official Publication of the American Occupational Therapy Association
Title The Practice of Humanistic Teaching-learning.
Date May 1974
Journal The American Journal of Occupational Therapy. : Official Publication of the American Occupational Therapy Association
Title Looking After the Under-fives--a Course for Child-minders.
Date April 1969
Journal Nursing Times
Title An Analysis of the Philosophy of Occupational Therapy.
Date January 1969
Journal The American Journal of Occupational Therapy. : Official Publication of the American Occupational Therapy Association

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