An intracerebral space occupying lesion was found in a 20-year-old woman with acute myelogenous leukemia (AML) when she was in complete hematological remission. Computerized tomography of the brain demonstrated the tumor in the roof of the third ventricle and its subsequent resolution after cranial irradiation and intraventricular cytosine-arabinoside. This form of central nervous system complication in AML has not been previously reported.
It is generally accepted from postmortem and experimental study that the lesion responsible for hemiballismus is localized in the contralateral subthalamic nucleus IS, 31.T h e following report indicates that the C T scan provides similar information.A 65-year-old woman with longstanding hypertension and ischemic heart disease was admitted 24 hours after the sudden onset of involuntary movements involving the left upper limb. Examination showed rapid, uncontrollable, large-amplitude flinging movements involving the left upper extremity and to a lesser extent the left lower one. T h e hemiballistic movements were accentuated by any attempt to move. decreased when the patient was relaxed, and disappeared during sleep.O n the day of admission, a CT scan using the EM1 scanner showed, both with and without enhancement, a small, wt.ll-defined density compatible with a hemorrhage in the region corresponding to the right subthalamic nucleus (Figure). T h e lesion was visible only o n the lower of the
Angiographic and pathologic findings are presented and correlated in a case of renal cavernous hemangioma, and considered in relation to 3 other cases published previously. A normal angiogram does not exclude a cavernous hemangioma. Those tumors with a large arterial component may be demonstrated in the arterial phase of the angiogram. A discrete tumor may show an area of hypovascularity by displacing normal renal tissue but a diffuse cavernous hemangioma is likely to yield a normal angiogram.
S U M MARY Measurement of the regional cerebral blood flow (rCBF) by the 133xenon inhalation method and computerised tomography were performed in 25 patients with presenile and senile deni6ntia. Reduction of rCBF and various degrees of ventricular enlargement and cortical sulcal widening were demonstrated in the majority of demented subjects. However, there was no correlation between rCBF values and the severity of ventricular dilatation or cortical atrophy. These findings suggest that loss of brain substance is not an important factor in the reduction of rCBF in dementia.
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