retinoblastoma is a retinal malignant tumor that occurs in early childhood. the annual incidence of retinoblastoma is approximately one per 14 000 live births. 250 to 300 new cases are reported in the united states each year. it develops due to inactivation of both alleles of the retinoblastoma susceptibility (rb1) gene. all hereditary cases (55%) are with bilateral and multifocal lesions, but ...

This study investigates how unilateral and bilateral vestibular deafferentation modifies visual vertical perception in the presence of dynamic and static visual cues. We tested 40 Menière's patients before and after (from 1 week to 1 year) a curative unilateral vestibular neurotomy (UVN), and 4 patients with bilateral vestibular loss. Patients' performances were compared with those of 24 health...

background and objectives:purtscher's retinopathy occurs with sudden loss of vision. in this article, a case of post-partumpurtscher's-like retinopathy was investigated. case report:the patient was an 18-year-old woman who presented with severe bilateral loss of vision, three days after childbirth. no systemic abnormalities were observed except preeclampsia. the results of ophthalmosc...

The pattern-reversal visual evoked response (VER) was recorded in 2 patients during transient monocular visual reduction. In both cases the VER was initially abolished. With recovery of vision there was gradual return of amplitude over a 3- to 8-minute period, while latencies remained unchanged from preattack values. These findings are discussed with regard to current understanding of the origi...

abstract meningeal melanocytoma is a rare tumor of nervous system, which originates from leptomeningeal melanocytes. the locations of melanocytoma in the nervous system are most frequently in the posterior fossa or along the spinal cord, and usually appear as an extra-axial mass. the manifestations of tumor are most often due to its compressing effect on adjacent nervous structures that causes ...