Sellar hemangiopericytoma

Authors report spontaneous necrosis of a sellar hemangiopericytoma, in a 44 year old man, revealed by a right cavernous syndrome. The initial CT scan showed a right sellar and parasellar spontaneous hyperdense process, intens ely and homogenously enhanced by contrast-agent. This process invaded the r ight cavernous sinus and extended to the sphenoid sinus. Magnetic resonance imaging showed a lesion in isointense on T1-weighted sequence and slightly , hyperintense on 72-weighted sequence, with an intense and homogenous enha ncement. The follow-zip CT scan performed 6 months later, showed a total ne crosis of the lesion. Angiography showed a slightly, vascularised process, with mass effect on the carotid and sylvian vessels. The sellar and parasel lar localization of hemangiopericytoma is rare. The spontaneous necrosis is exceptionnal, but it enabled us to distinguish it from meningioma.