Ossified Intramuscular Hemangioma

Although hemangioma is a common benign soft-tissue tumor, the formation of intratumoral ossification is rare. Ossified intramuscular hemangioma, an infrequent benign tumor, is characterized by a progressively enlarging painless mass in the lower extremity of young female. Herein, we report a case of 27-year-old female suffered from a progressively enlarging painless mass in her left thigh. The mass showed a ”Swiss cheese”-like calcification on plain radiographs. Magnetic resonance images revealed multiple cystic spaces with marked contrast enhancement suggesting vascular nature and intratumoral non-enhanced foci of very low signal intensity. The image finding may prompt the diagnosis of ossified intramuscular hemangioma, which was confirmed by the histologic examination. Our report emphasized that the characteristic imaging features of ossified intramuscular hemangioma might be helpful for the correct diagnosis preoperatively.