Acute and chronic brain infarcts on MR imaging in a 20-year-old woman with acute posterior multifocal placoid pigment epitheliopathy.

A 20-year-old woman recently diagnosed with acute posterior multifocal placoid pigment epitheliopathy developed headaches, weakness, and paresthesias. MR imaging of the brain revealed an acute infarct (demonstrated by diffusion-weighted images) in the head of the right caudate nucleus, a chronic infarct with encephalomalacia in the body of the corpus callosum, and multiple foci of abnormal signal intensity in the white matter of the centrum semiovale.

Intraosseous sacral myxopapillary ependymoma and the differential diagnosis of sacral tumors.

Although involvement of other regions of the spinal cord and brain stem is seen, myxopapillary ependymoma is most commonly found at the filum terminale or cauda equina. Less commonly, myxopapillary ependymoma may occur outside the central nervous system from direct metastatic extension of an intrathecal tumor, and rarely it may present as a primary tumor outside the thecal sac. The authors present a case of primary sacral myxopapillary ependymoma, which was first diagnosed as a chordoma. They then discuss the magnetic resonance imaging findings of this and other sacral tumors. Myxopapillary ependymoma should be considered in the differential diagnosis for a primary expansile sacral mass along with other lesions such as chordoma, aneurysmal bone cyst, and giant cell tumor.

Intracranial vasculitis and multiple abscesses in a pregnant woman.

Cerebral vasculitis is an unusual disorder with many causes. Infectious causes of cerebral vasculitis are predominantly bacterial or viral in nature. Purulent bacterial vasculitis is most often a complication of severe bacterial meningitis. The patient is a 25-year-old African American female, 25 weeks pregnant, who presented to the neurology service after a consult and referral from an outside hospital. She had a 1-month history of right sixth nerve palsy. Initial workup included a negative lumber puncture and a noninfused magnetic resonance imaging (MRI). Three days later, the patient developed right-sided migraine headaches and right third nerve palsy. The angiogram revealed diffuse irregularity and narrowing of the petrous, cavernous, and supraclinoid portions of the internal carotid and right middle cerebral arteries. Shortly thereafter, an MRI examination revealed diffuse leptomeningeal enhancement and abscess and a right parietal subdural empyema. Infectious vasculitis secondary to purulent meningitis has a rapidly progressive course and presents with cranial nerve palsy with involvement of the cavernous sinus. Although the association of this disease with pregnancy has not been established, it should be recognized that the early imaging studies may be negative or discordant and follow-up imaging might be necessary.

Transthoracic needle aspiration in patients with severe emphysema. A study of lung transplant candidates.

PURPOSE: To describe the risks of transthoracic needle aspiration (TTNA) in a population of patients with severe lung disease: candidates for lung transplantation. MATERIALS AND METHODS: Eight of 190 patients evaluated for lung transplantation underwent TTNA of nine pulmonary nodules (mean diameter, 14 mm; range, 0.8 to 2.2 cm). We evaluated pneumothorax rate, chest tube rate, duration of placement, and pulmonary function test results. RESULTS: All patients had emphysema; two had alpha 1-antitrypsin deficiency. The mean FEV1 of all patients was 0.64 L (22% of predicted; range, 17 to 28%), indicating severe air-flow obstruction. Six patients required a chest tube (50%); three chest tubes were placed emergently on the CT scanner table. Three patients required a second chest tube for persistent air leak. Tubes were in place for 1 to 22 days (mean, 10 days). One patient had chest tubes for 22 days and required intubation. CONCLUSION: TTNA in patients with marked emphysema is complicated by a high incidence of pneumothorax, rapid development of tension pneumothorax and chest tube placement. Since nodules in lung transplant candidates may represent bronchogenic carcinoma, serial CT scans to demonstrate lesion stability or growth, or thoracoscopic resection should be considered as an alternate approach to TTNA to avoid the significant morbidity of the procedure in these patients.