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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 27:931-933, April 2006
© 2006 American Society of Neuroradiology

Case Report
HEAD AND NECK

Kaposiform Hemangioendothelioma Arising from the Internal Auditory Canal

J.M. Chang^a, B.J. Kwon^a, M.H. Han^a,b, H.S. Kang^a and K.H. Chang^a,b,c

^a Department of Radiology, Seoul National University College of Medicine, Seoul, Korea
^b Clinical Research Institute, Seoul National University Hospital, Seoul, Korea
^c Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Korea

Address correspondence to: Bae Ju Kwon, MD, Department of Diagnostic Radiology, Seoul National University Hospital, 28 Yongon-dong, Chongno-gu, Seoul 110–744, Korea

SUMMARY: Kaposiform hemangioendothelioma is a rare vascular tumor and locally aggressive endothelial-derived spindle cell neoplasm, which occurs almost exclusively in infants and adolescents. Radiologically, hemangioendothelioma, including Kaposiform hemangioendothelioma, is seen as a highly vascularized well-enhancing tumor, but no characteristic findings differentiate Kaposiform hemangioendothelioma from other soft-tissue tumors, particularly when the tumor is too small to have any locally aggressive features or identifiable large vessels. We present a case of Kaposiform hemangioendothelioma in the internal auditory canal that had no differential features on initial MR images and rapidly grew into a huge mass in a few months.