Intramuscular hemangiomas are rare vascular anomalies, currently (at the time of writing in 2022) in the "Provisionally unclassified vascular anomalies" of the ISSVA classification of vascular anomalies. They should not be confused with infantile hemangiomas which are much more common and stain GLUT-1 positive, nor with intramuscular venous malformations which are sometimes referred to inappropriately as "hemangiomas".

Growth is generally proportional to somatic growth, or very slowly progressive over time. Some cases can mimic arteriovenous malformations (AVMs) on Doppler because of large arterialized vessels, but resistive index is generally high and there is usually no significant arteriovenous shunting, in addition to there always being a discrete mass which should not be seen in AVMs.

Case courtesy of Pr Laurent Guibaud.