Surgical management of recurrent malignant schwannoma of the scalp.

Localization of malignant schwannoma in the head and neck region is rare. Malignant schwannoma is a highly aggressive, slowly growing, encapsulated tumor of nerve sheath origin. The most common presentation of this tumor is a subcutaneous progressively enlarging mass with or without neurologic symptoms.

Hemangiopericytoma of the pineal region.

We report a unique case of a 37-year-old female suffering from hemangiopericytoma of the pineal region, successfully excised by surgery. Hemangiopericytomas are rare malignant vascular tumors arising from mesenchymal cells with pericytic differentiation. These tumors usually develop in the limbs, pelvis, head, neck, and mostly in the muscle tissue.

Effects of computer monitor-emitted radiation on oxidant/antioxidant balance in cornea and lens from rats.

Purpose: This study aims to investigate the possible effects of computer monitor-emitted radiation on the oxidant/antioxidant balance in corneal and lens tissues and to observe any protective effects of vitamin C (vit C).

Methods: Four groups (PC monitor, PC monitor plus vitamin C, vitamin C, and control) each consisting of ten Wistar rats were studied. The study lasted for three weeks.