Chordoma.

Four cases of intracranial chordomas are reported. Intracranial chordomas initially tend to occur with sixth nerve paresis and subsequently with visual disturbance and optic disc changes. Computed tomography demonstrated an isodense mass in one case, a low-density mass in another case, and both an isodense and a partial high-density in two cases. Histopathologically, isodense areas were coincident with regions of compact tumor cells, low-density areas coincided with abundant mucinous intercellular matrices, and high-density areas were coincident with cartilaginous matrices or calcifications.