Biomedical subjects

Jeong-Taik Kwon

Publications and source records attributed to Jeong-Taik Kwon.

2 recordsLinked to original sources

PubMed2006

Wilbrand's knee: does it exist?

OBJECTIVE: In 1904, Hermann Wilbrand reported that nasal ON fibers form a loop into the contralateral ON, subsequently referred to as Wilbrand's knee. He had further theorized that a lesion affecting Wilbrand's knee would develop a distinct visual field defect characterized by an ipsilateral central scotoma with a contralateral superotemporal visual field defect. We present clinical evidence that disputes the existence of Wilbrand's knee. METHODS: A retrospective analysis of 3 patients whose ONs were divided at the ON-chiasm junction is presented. Two patients had an ONS meningioma and the other patient had sarcoidosis of the ON. Resection of the lesion and the ON up to the nerve-chiasm junction was done to prevent the disease from extending into the OC and the contralateral ON. The patients had detailed neuro-ophthalmologic evaluations preoperatively and postoperatively. RESULTS: After the resection of the ON at the ON-chiasm junction in the 3 patients, junctional scotoma could not be detected by visual perimetry. CONCLUSION: No clinical perimetric evidence was found to support the existence of Wilbrand's knee in the anterior visual pathway.

Adult↗

PubMed2004

Surgical procedure "simplified retrosigmoid approach" for C-P angle lesions.

Previously, we reported surgical results of the simplified retrosigmoid approach for vestibular nerve sectioning in the cases with intractable vertigo. Here, we introduce in details surgical procedures of the simplified retrosigmoid (also called "subasterional" here for simplification) approach developed by one of the authors (J.H.L.). This approach is to operate cerebello-pontine (C-P) angle lesions through a small upper lateral window below the transverse-sigmoid junction. The retroauricular 4-5 cm skin incision, triangular craniectomy 2 cm in width, dural opening and closure, special considerations, and reconstruction of the skull defect were outlined. The bony landmarks for triangle craniectomy below asterion were described in detail. The C-P angle was appropriately approached for microvascular decompression, removal of C-P angle tumors, and vestibular nerve resection. This subasterional approach was characterized by short operation time of 1-3 h and less postoperative discomforts compared to the conventional retrosigmoid approach.

Cerebellar Diseases↗