Clinical History: 2-year old boy with an asymptomatic mass in his left buttock

Diagnosis: Intramuscular hemangioma

MR Technique:

Imaging of the pelvis was performed on a 3T MR system (Skyra, Siemens). (A) Coronal T2-weighted TIRM (TR/TE 4000/78ms), (B) axial T1-weighted TSE (TR/TE 450/18ms), (C) axial FS T2-weighted TSE (TR/TE 2500/84ms), and (D) T2-weighted TIRM (TR/TE 4000/70ms) were initially acquired. After intravenous administration of contrast agent (MultiHance, 0.1mmol/kg BW), (E) coronal and (F) axial FS T1-weighted imaging was also performed using a VIBE sequence.

Imaging Findings:

The hemangioma within the left gluteus maximus of demonstrates a lobulated, well-defined appearance without features of local invasion. On T1WI, the lesion exhibits intermediate to slightly low signal relative to the skeletal muscle. On T2WI, the lesion is generally of high signal intensity with nodular and linear areas of low signal corresponding to phleboliths and flow voids. After injection of contrast agent, the lesion avidly enhances.