The aim of this study is to determine the impact of surgery on tumor progression and malignant degeneration in hemispheric diffuse astrocytoma WHO grade II. Twenty-eight patients who were operated or underwent stereotactic biopsy for hemispheric diffuse astrocytoma WHO grade II at Marmara University between January 1987 and January 1996, were prospectively reviewed for the presence of recurrenc...

One hundred patients affected by multifocal brain lesions were investigated by serial stereotactic biopsy. Systemic diseases and primary neoplasms elsewhere were previously ruled out. The histological diagnosis obtained in this series comprises malignant gliomas in 37% of patients; primary non-Hodgkin's brain lymphoma in 15%; metastatic brain tumours in 15% (no evidence of the primary tumour at...

BACKGROUND Cerebral lymphoma is a rare non-Hodgkin's lymphoma, which involves the brain primarily or after systemic involvement. Because of its infiltrating nature and its sensitivity to radio- and chemotherapy, surgical removal has a limited role in its treatment and only a stereotactic biopsy is necessary for confirming the diagnosis. METHODS The data from all cases in whom the cerebral lym...

BACKGROUND Structural follow-up magnetic resonance imaging (MRI) after stereotactic radiosurgery (SRS) for brain metastases frequently displays local changes in the area of applied irradiation, which are often difficult to interpret (e.g., local tumor recurrence, radiation-induced changes). The use of stereotactic biopsy for histological assessment of these changes has a high diagnostic accurac...

Submillimetric precision is essential for stereotactic neurosurgical procedures. However, accuracy of standard neuro-surgical procedures such as navigated biopsies and shunts is currently limited due to manual alignment of the biopsy needle or manual placement of the shunt catheter. The aim of this study is to evaluate the feasibility and accuracy of a novel robotic positioning device for stere...

Diagnosis of breast cancer at its earliest stage affords women the best prognosis. The role of the breast imager has evolved from cancer screening and detection to now include diagnosis and management with the widespread adoption of image-guided core biopsy. This article will briefly discuss the current imageguided biopsy techniques for the diagnosis of suspicious breast findings, specifically,...