Orbital Sinus Histiocytosis

Abstract

This case report describes the appearance of orbital sinus histiocytosis by magnetic resonance (MR) imaging. Four years after the remission of unilateral cervical adenopathy due to sinus histiocytosis, a 6-year-old girl developed orbital sinus histiocytosis with extension into the middle cranial fossa. Computed tomography demonstrated a homogeneously enhancing lesion; on MR, this tumor was isointense to gray matter on T1-weighted, proton density, and T2-weighted images. Vascular embarrassment was clearly shown by MR.