[Lipoma of corpus callosum with callosal agenesis (author's transl)]

Intracranial lipoma is rare. The case reported here was a woman aged 60. She came to our hospital with complaint of headache. Neurological examination was negative. Plain craniogram showed abnormal calcification in the callosal region. A-P view of right carotid angiogram revealed winding sinous course of bilateral anterior cerebral arteries around the calcific deposit. Lateral view showed vertical stretching of ascending portion of the anterior cerebral artery. In the frontal projection of the pneumogram, the lateral ventricles were separated and concave medially with hornlike superior angles. The third ventricle extended upward between the lateral ventricles. The plain CT scan revealed an abnormal low density area (Hounsfield's number-90- -50) in the callosal region. The calcific deposit was seen within a low density area. At operation, the callosal tumor was partially removed. Histologically, lipomatous tissue was demonstrated. In reference to literature, we discussed the roentgenographic findings, especially computed tomography of callosal lipoma.