Presentation of Case A 70-year-old woman was admitted to the hospital because of obtundation, aphasia, and a right hemiparesis. She had a five-year history of treated hypertension. Four months before admission a lumpectomy was performed because of breast carcinoma, with normal findings on examination of axillary lymph nodes, and radiation therapy was begun. Forty-six days before admission the patient entered another hospital because of the onset of atrial fibrillation, and treatment with warfarin and quinidine was initiated. Four weeks before admission a complete blood count was normal except that the platelet count was 130,000 per cubic millimeter. The patient felt.
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