Papillary endolymphatic sac tumors: CT, MR imaging, and angiographic findings in 20 patients.

Abstract

Papillary endolymphatic sac tumors are destructive, hypervascular lesions that arise from the temporal bone retrolabyrinthine region. Increased signal intensity at unenhanced T1-weighted MR imaging is common and may help distinguish these lesions from more common, aggressive temporal bone tumors.