T1 sagittal pre gad T1 axial post gad T2 axial

Diagnosis: Renal cell metastasis

Metastatic disease to the CNS most commonly involves the brain parenchyma. Leptomeningeal and calvarial metastases are more common than dural lesions. Breast, lung, and renal cell carcinoma are the most common neoplasms which metastasize to the calvarium. Hemangiopericytoma is a mesenchymal neoplasm which can mimic a calvarial metastasis. They are highly vascular tumors which arise from pericytes surrounding capillaries. Slightly more men are affected than woman and the age of presentation is in the 40s. They are aggressive neoplasms which invade and metastasize. On CT and MR they may involve the calvarium or subcutaneous tissues of the scalp. Intense enhancement, with necrosis and prominent flow voids are characteristic. T1 signal is isointense with gray matter while T2 signal is heterogeneous. Plasmacytoma is another consideration in the differential of a solitary calvarial mass, although it is less likely here due to the fact that flow voids are present. Related Cases

Tuberculosis Breast cancer mets Renal cell mets