Papillary endolymphatic sac tumors: Imaging findings

S. K. Mukhrrji, M. Castillo, W. W. Lo, W. Nemek, J. S. Lewin, P. Pate

Research output: Contribution to journalArticlepeer-review


Purpose: To present (he CT, MR imaging, and angiographie findings in 20 paliems with papillary endolymphatic sac tumors (PELST). Materials and Methods: The clinical and imaging studies in 20 patients with a histological diagnosis of PELST were retrospectively reviewed. All patients underwent a combination of CT ( 18/20). MR imaging ( 15/20) and angiography ( 12/20). CT studies were evaluated for bone erosion, and central and peripheral calcification. MR imaging was evaluated for Tl W and T2W signal intensity, enhancement patterns, and presence of flow voids. Review of the angiographie studies determined blood supply to the tumors. Results: CT showed all tumors to be destructive and to contain intratumoral calcifications centered in the retrolabynnthine region. MR imaging appearance varied with the size of the lesion. 12/15 (80%) tumors demonstrated increased T1W signals. The location of this high signal was circumferential in small lesions (mean diameter < 3 cm) and scattered throughout the lesion in advanced tumors. Flow voids were only seen in tumors with mean diameters > 2 cm. The blood supply arose predominantly from the external carotid artery (ascending pharyngeal artery [ 12/12|. and stylomastoid artery 112/12]). Large tumors had additional supply from the internal carotid and posterior circulation. Conclusions: PELST are destructive hypervascular lesions that arise from the retrolabyrinthine region of the temporal bone. Increased Tl W signals on nonenhanced MR imaging are commonly present and may help distinguish these lesions from other more common aggressive tumors that involve the temporal bone.

Original languageEnglish (US)
Number of pages1
JournalSkull Base Surgery
Issue numberSUPPL. 1
StatePublished - Dec 1 1997

ASJC Scopus subject areas

  • Clinical Neurology


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