Radiologic-pathologic correlation. Congenital choroid plexus papillomas.

At 33 weeks of pregnancy, a 29-year-old woman presented with uterine contractions. A transabdominal obstetrical sonogram with Doppler revealed severe hydrocephalus secondary to a large avascular third ventricular mass (Fig 1A). Delivery by cesarean section at 34 weeks revealed marked macrocephaly, widely separated sutures, and tense fontanelles. Contrast-enhanced computed tomography (CT) of the infant’s brain revealed an enhancing slightly corrugated mass in the third ventricle with dilatation of the lateral ventricles, intraventricular hemorrhage (Figs 1B, 2, and 3), and an occipital subgaleal collection, which communicated with the left lateral ventricle consistent with a pseudomeningocele (Figs 2–4A). Surgery was not performed because of the patient’s poor medical condition. At 10 days of life, the occipital pseudomeningocele spontaneously ruptured, causing leakage of cerebrospinal fluid (CSF) onto the scalp, an event that ultimately led to the infant’s death. Autopsy revealed a 2.5 3 2 3 2-cm discrete spherical mass in the posterior third ventricle. The mass was compressing the midbrain and aqueduct, causing severe sec-