Persistent isodense intraventricular hematoma caused by intraventricular saccular aneurysm.

A case of intraventricular hemorrhage secondary to an intraventricular saccular aneurysm is presented in which the hematoma mass gave a false appearance of resolution secondary to its progressive isodense appearance on serial computerized cranial tomograms. Intraventricular saccular aneurysms are unusual lesions and a most uncommon cause of intraventricular hemorrhage. Diagnosis of intraventricular hemorrhage has been greatly facilitated since the advent of cranial computerized tomography though elucidation of the definitive cause of hemorrhage in this case still depended upon cerebral angiography. In addition, the development of isodensity by the hematoma mass on serial computed tomograms has led to this case report.