hemangiosarcoma

[ hĭ-măn′jē-ō-sär-kōmə ]

n.

A rare malignant neoplasm characterized by rapidly proliferating anaplastic cells derived from blood vessels and lining blood-filled spaces.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.