The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Ender Korfali - One of the best experts on this subject based on the ideXlab platform.
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anatomical aspects in the transsphenoidal transethmoidal approach to the Optic Canal an anatomic cadaveric study
Journal of Cranio-maxillofacial Surgery, 2012Co-Authors: Selcuk Yilmazlar, Ozlem Saraydaroglu, Ender KorfaliAbstract:Abstract Background Determining anatomic landmarks during a transsphenoidal–transethmoidal approach to the Optic Canal region is of critical importance. Methods Sella–parasella sphenoid bone blocks were extracted from adult cadavers. Anatomic dissections were performed in the Optic Canal region using a surgical microscope in 30 samples. Quantitative measurements were done using photographic techniques. For histological evaluation, coronal and longitudinal cross-sections were taken from the bilateral Optic Canal in seven decalcified samples. Results Optic protuberance (OP), carotid protuberance (CP), medial Opticocarotid recess (MOCR) and lateral Opticocarotid recess (LOCR) were defined as lateral landmarks determining the width of the opening in the extended transsphenoidal–transethmoidal approach. Among all anatomic markers, LOCR was the most determinant lateral marker with tubercular recess the most prominent central marker. OPs showing the Optic Canal direction and inter-recessal sulci had similar distinguishing rates in the sphenoid sinus base. Inter-recessal sulci formed by OPs and CPs were observed between MOCR and LOCR in most samples. In histologic sections, the dural sheath was thicker inferolaterally to the Optic nerve compared to superiorly and medially; collagen arrangement was dense and irregular. Conclusion Although LOCRs and tubercular recesses are safe and prominent markers in extended transsphenoidal–transethmoidal approaches, other anatomic markers should also be taken into consideration to perform an efficient Optic Canal approach and Optic Canal decompression. Other factors for safe dissection are the length of the Optic Canal, bone thickness, adherence of dural structures and the course of the intradural ophthalmic artery.
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Anatomical aspects in the transsphenoidal–transethmoidal approach to the Optic Canal: An anatomic–cadaveric study
Journal of Cranio-maxillofacial Surgery, 2011Co-Authors: Selcuk Yilmazlar, Ozlem Saraydaroglu, Ender KorfaliAbstract:Abstract Background Determining anatomic landmarks during a transsphenoidal–transethmoidal approach to the Optic Canal region is of critical importance. Methods Sella–parasella sphenoid bone blocks were extracted from adult cadavers. Anatomic dissections were performed in the Optic Canal region using a surgical microscope in 30 samples. Quantitative measurements were done using photographic techniques. For histological evaluation, coronal and longitudinal cross-sections were taken from the bilateral Optic Canal in seven decalcified samples. Results Optic protuberance (OP), carotid protuberance (CP), medial Opticocarotid recess (MOCR) and lateral Opticocarotid recess (LOCR) were defined as lateral landmarks determining the width of the opening in the extended transsphenoidal–transethmoidal approach. Among all anatomic markers, LOCR was the most determinant lateral marker with tubercular recess the most prominent central marker. OPs showing the Optic Canal direction and inter-recessal sulci had similar distinguishing rates in the sphenoid sinus base. Inter-recessal sulci formed by OPs and CPs were observed between MOCR and LOCR in most samples. In histologic sections, the dural sheath was thicker inferolaterally to the Optic nerve compared to superiorly and medially; collagen arrangement was dense and irregular. Conclusion Although LOCRs and tubercular recesses are safe and prominent markers in extended transsphenoidal–transethmoidal approaches, other anatomic markers should also be taken into consideration to perform an efficient Optic Canal approach and Optic Canal decompression. Other factors for safe dissection are the length of the Optic Canal, bone thickness, adherence of dural structures and the course of the intradural ophthalmic artery.
Sue C Kaste - One of the best experts on this subject based on the ideXlab platform.
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reversal of Optic Canal stenosis in osteopetrosis after bone marrow transplant
American Journal of Ophthalmology, 2000Co-Authors: Natalie C Kerr, Winfred C Wang, Yasaman Mohadjer, Barrett G Haik, Sue C KasteAbstract:Abstract PURPOSE: To describe a patient with infantile osteopetrosis and Optic atrophy secondary to Optic Canal stenosis who demonstrated Optic Canal enlargement after bone marrow transplant. METHODS: Case report. A 3-month-old infant with infantile “malignant” osteopetrosis underwent ophthalmic examination, including visual evoked potentials, electroretinogram, and computed tomography (CT). Bone marrow transplant was performed at 8 months of age. RESULTS: Examination revealed visual loss and Optic atrophy, left eye greater than right eye, secondary to Optic Canal stenosis. Flash visual evoked potentials revealed a normal waveform in both eyes with increased latency in the left eye. Electroretinogram was normal in both eyes. CT after bone marrow transplant showed enlargement of the Optic Canals. Vision remains stable 43 months after bone marrow transplant. CONCLUSIONS: Bone marrow transplant in infantile osteopetrosis may be followed by reversal of Optic Canal stenosis and preservation of vision.
Lee A Zimmer - One of the best experts on this subject based on the ideXlab platform.
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Computed Tomography Anatomy of the Optic Canal
Otolaryngology–Head and Neck Surgery, 2020Co-Authors: Catherine K Hart, Lee A ZimmerAbstract:Objective (1) Analyze the radiographic anatomy of the Optic Canal in relationship to the sphenoid sinus. (2) Understand the role variation in Optic Canal anatomy may have in the variability of outcomes in Optic nerve decompression. Methods Fine cut computed tomography images of the sinuses were obtained with an IRB waiver. Optic Canal dimensions were measured on sinus computed tomography images of 96 patients. 191 Optic Canals were analyzed (111 females, 80 males). Student T-test calculations were performed for statistical analysis on computer software. Results The average medial Canal wall length was 1.48 centimeters (range 0.7–2.3). The length in males was 1.61 centimeters (1.1–2.3) as compared to 1.39 centimeters (0.7–2.0) in females (p=8.0–7). The average degree of exposure of the Optic Canal exposed to the sphenoid sinus was 101.3 degrees (56–176). The degree of exposure was 105.6 in males versus 98.2 in females (p=.01). The potential area of Canal exposed to the sphenoid sinus was 0.66 centimeters squared or 28% of the total surface area. The potential area exposed to the sphenoid sinus in males was 0.76cm2 (28%) and 0.58 centimeters squared (27%) in females. Conclusions A wide range in medial Canal wall length and exposure of the bony Optic Canal to the sphenoid sinus exists on CT images. The variation in medial Canal wall length and in Optic Canal exposure to the sphenoid sinus may contribute to the variability in success rates of endoscopic Optic nerve decompression for Optic neuropathy.
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anatomy of the Optic Canal a computed tomography study of endoscopic nerve decompression
Annals of Otology Rhinology and Laryngology, 2009Co-Authors: Catherine K Hart, Phillip V Theodosopoulos, Lee A ZimmerAbstract:Objectives:Endoscopic Optic nerve decompression has variable success rates. Our goal was to further delineate the radiographic anatomy of the Optic Canal to determine whether the variable success can be explained on anatomic principles.Methods:The Optic Canal dimensions and the degree of Optic Canal exposure to the sphenoid sinus were measured on sinus computed tomography images of 96 patients.Results:A total of 191 Optic Canals were analyzed (111 female subjects and 80 male subjects). The average medial Canal wall length was 1.48 cm (range, 0.7 to 2.3 cm). The length in male subjects was 1.61 cm (range, 1.1 to 2.3 cm), as compared to 1.39 cm (range, 0.7 to 2.0 cm) in female subjects (p < 0.001). Onodi cells and pneumatized anterior clinoid processes were present on 14 and 16 images, respectively. The average degree of exposure of the Optic Canal to the sphenoid sinus in Optic Canals without Onodi cells or clinoid pneumatization was 99.3°, and in Optic Canals with both Onodi cells and clinoid pneumatizati...
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computed tomography anatomy of the Optic Canal
Otolaryngology-Head and Neck Surgery, 2008Co-Authors: Catherine K Hart, Lee A ZimmerAbstract:Objective(1) Analyze the radiographic anatomy of the Optic Canal in relationship to the sphenoid sinus. (2) Understand the role variation in Optic Canal anatomy may have in the variability of outcomes in Optic nerve decompression.MethodsFine cut computed tomography images of the sinuses were obtained with an IRB waiver. Optic Canal dimensions were measured on sinus computed tomography images of 96 patients. 191 Optic Canals were analyzed (111 females, 80 males). Student T-test calculations were performed for statistical analysis on computer software.ResultsThe average medial Canal wall length was 1.48 centimeters (range 0.7–2.3). The length in males was 1.61 centimeters (1.1–2.3) as compared to 1.39 centimeters (0.7–2.0) in females (p=8.0–7). The average degree of exposure of the Optic Canal exposed to the sphenoid sinus was 101.3 degrees (56–176). The degree of exposure was 105.6 in males versus 98.2 in females (p=.01). The potential area of Canal exposed to the sphenoid sinus was 0.66 centimeters square...
Selcuk Yilmazlar - One of the best experts on this subject based on the ideXlab platform.
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anatomical aspects in the transsphenoidal transethmoidal approach to the Optic Canal an anatomic cadaveric study
Journal of Cranio-maxillofacial Surgery, 2012Co-Authors: Selcuk Yilmazlar, Ozlem Saraydaroglu, Ender KorfaliAbstract:Abstract Background Determining anatomic landmarks during a transsphenoidal–transethmoidal approach to the Optic Canal region is of critical importance. Methods Sella–parasella sphenoid bone blocks were extracted from adult cadavers. Anatomic dissections were performed in the Optic Canal region using a surgical microscope in 30 samples. Quantitative measurements were done using photographic techniques. For histological evaluation, coronal and longitudinal cross-sections were taken from the bilateral Optic Canal in seven decalcified samples. Results Optic protuberance (OP), carotid protuberance (CP), medial Opticocarotid recess (MOCR) and lateral Opticocarotid recess (LOCR) were defined as lateral landmarks determining the width of the opening in the extended transsphenoidal–transethmoidal approach. Among all anatomic markers, LOCR was the most determinant lateral marker with tubercular recess the most prominent central marker. OPs showing the Optic Canal direction and inter-recessal sulci had similar distinguishing rates in the sphenoid sinus base. Inter-recessal sulci formed by OPs and CPs were observed between MOCR and LOCR in most samples. In histologic sections, the dural sheath was thicker inferolaterally to the Optic nerve compared to superiorly and medially; collagen arrangement was dense and irregular. Conclusion Although LOCRs and tubercular recesses are safe and prominent markers in extended transsphenoidal–transethmoidal approaches, other anatomic markers should also be taken into consideration to perform an efficient Optic Canal approach and Optic Canal decompression. Other factors for safe dissection are the length of the Optic Canal, bone thickness, adherence of dural structures and the course of the intradural ophthalmic artery.
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Anatomical aspects in the transsphenoidal–transethmoidal approach to the Optic Canal: An anatomic–cadaveric study
Journal of Cranio-maxillofacial Surgery, 2011Co-Authors: Selcuk Yilmazlar, Ozlem Saraydaroglu, Ender KorfaliAbstract:Abstract Background Determining anatomic landmarks during a transsphenoidal–transethmoidal approach to the Optic Canal region is of critical importance. Methods Sella–parasella sphenoid bone blocks were extracted from adult cadavers. Anatomic dissections were performed in the Optic Canal region using a surgical microscope in 30 samples. Quantitative measurements were done using photographic techniques. For histological evaluation, coronal and longitudinal cross-sections were taken from the bilateral Optic Canal in seven decalcified samples. Results Optic protuberance (OP), carotid protuberance (CP), medial Opticocarotid recess (MOCR) and lateral Opticocarotid recess (LOCR) were defined as lateral landmarks determining the width of the opening in the extended transsphenoidal–transethmoidal approach. Among all anatomic markers, LOCR was the most determinant lateral marker with tubercular recess the most prominent central marker. OPs showing the Optic Canal direction and inter-recessal sulci had similar distinguishing rates in the sphenoid sinus base. Inter-recessal sulci formed by OPs and CPs were observed between MOCR and LOCR in most samples. In histologic sections, the dural sheath was thicker inferolaterally to the Optic nerve compared to superiorly and medially; collagen arrangement was dense and irregular. Conclusion Although LOCRs and tubercular recesses are safe and prominent markers in extended transsphenoidal–transethmoidal approaches, other anatomic markers should also be taken into consideration to perform an efficient Optic Canal approach and Optic Canal decompression. Other factors for safe dissection are the length of the Optic Canal, bone thickness, adherence of dural structures and the course of the intradural ophthalmic artery.
Jianmin Zhang - One of the best experts on this subject based on the ideXlab platform.
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an evolving perspective of endoscopic transnasal Optic Canal decompression for traumatic Optic neuropathy in clinic
Neurosurgical Review, 2019Co-Authors: Wanglu Hu, Qun Wu, Jianmin ZhangAbstract:: Traumatic Optic neuropathy (TON) is a serious complication of craniofacial trauma, which damages the Optic nerve indirectly and leads to dysfunction of visual acuity. The clinical intervention for a patient with TON includes Optic Canal decompression (with or without steroids), treatment with corticosteroids alone, or observation only. Currently, there is a controversy among clinicians as to which treatment is optimal. An increasing number of retrospective studies have unveiled that patients could experience significant improvement in visual acuity after Optic Canal decompression surgery, particularly endoscopic transnasal/transethmosphenoid Optic Canal decompression (ETOCD), either with or without corticosteroids. In this review, we discuss the evolving perspective on surgical treatment, specifically ETOCD, for the management of patients with TON and focus mainly on the therapeutic efficacy, safety, and resulting prognosis in the clinic.