Fig. 16

Ependymoma in a 54-year-old man causing headaches, nausea, vomiting, and hydrocephalus. Sagittal T1-weighted image (a) shows a large lesion involving the pineal gland (arrow), which contains areas of low and intermediate signal. Axial T2-weighted image (b) demonstrates cystic areas within the tumour (*) that have high signal and solid portions (arrow) with mixed intermediate and high signal. Solid portions of the tumour (arrow) show contrast enhancement on coronal T1-weighted image (c). The tumour causes hydrocephalus from compression of the midbrain and cerebral aqueduct, pons and cerebellum