Optimal number of beams for stereotactic body radiotherapy of lung and liver lesions.

Purpose: The aim of this study was to determine the optimal number of coplanar and noncoplanar external beams in the setting of stereotactic body radiotherapy (SBRT).

Methods And Materials: Spherical targets were delineated within 2 separate extracranial sites, the lung and liver, with diameters varying from 2 cm to 7 cm to cover the range of volumes used in SBRT. Treatment plans were created for all target volumes using 5 to 15 geometrically optimized coplanar and noncoplanar conformal beams.

Radiation induced adult medulloblastoma: a case report.

Adult medulloblastoma is a rare intracranial tumor. Our patient is a 61 year old woman treated with cranial irradiation 15 years previously for a low grade astrocytoma in the left posterior temporal lobe that was recently diagnosed with medulloblastoma in the right cerebellum. This is the first reported case of radiation induced adult medulloblastoma.

Atypical teratoid/rhabdoid tumor case report: treatment with surgical excision, radiation therapy, and alternative medicines.

Intracranial atypical teratoid/rhabdoid tumors (AT/RT) are rare with a poor prognosis. We report one case of a 7-year old girl living over 17 months after the diagnosis of AT/RT in the left frontal lobe. Treatment was partial surgical resection and post-operative radiation therapy.