✓ A rare case is reported of a solitary abscess of the brain-stem which was suspected clinically, confirmed surgically, and successfully removed. The few reports of similar cases in the literature are reviewed.
Widening of an intervertebral foramen in the cervical spine is a striking radiogical finding and generally denotes a patient with a dumbbell spinal tumor. Other, rare causes can also produce widening, such as expansion, tortuosity or elongation of the vertebral arteries, and congenital absence of a pedicle.
SYNOPSIS An intracerebral Schwannoma giving rise to temporal lobe epilepsy is described. The possible origin of such tumours in the central nervous system in general, and in the temporal lobe in particular, is discussed.
The radiographic appearances of intracranial metastases from primary osteogenic sarcomas in three patients are presented. In two patients, the diagnosis of metastatic disease could be made on conventional roentgenograms of the skull since mineralization of tumor osteoid could be seen within the brain parenchyma. This had a similar appearance to the primary bone tumor. Angiography in two of the three patients revealed the cerebral metastases to be hypervascular with tumor vessels, tumor stain and early draining veins.Cancer 43 were the lungs (95%) and other bones (50%).' Only three patients (1.5%) had ,cerebral involvement which was discovered at autopsy. l'he radiographic appearance of cerebral metastases from osteosarcoma in three additional patients is presented.
CASE REPORTS Case 1A 'LO-year-old woman presented with a two-year history of a progressive painful swellirig of the right thigh. Rocntgenograins of the right femur showed a large turnor with a n extraosseous soft tissue component containing "tumor new bone" diagnostic of an osteogenic sarcoma (Fig. 1). This was confirmed o n biopsy. Skeletal survey demonstrated multiple ossified metastases of the lungs a n d the lumbar spine. Conventional radiographs of the skull revealed ttvo fairly well-circumscribed calcified nodules in thi. right occipital a n d temporril regions.Computerized tomography confirmed these two 16-sions a n d demonstrated other calcified lesions in ihe right temporal a n d one in the left frontal lobe (Fig. 2 ) . 'The absorption coefficients of these lesions were similar to that of the surrounding calvarium. T h e patient is being treated with combination chemotherapy a n d radiotherapy.
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