2 day old female with left lower extremity hemangioma, evaluate for extent of involvement Multiple conglomerate foci of T2 signal abnormality extend from the retroperitoneum inferior to the left kidney to the pelvis with encasement of the rectum and extension into the peritoneum. There is encasement of the left buttock with less extensive involvement of the right buttock as well as encasement of the proximal left thigh along its lateral, posterior, and medial aspects. Foci of signal abnormality extend along the femur to the level of the knee with involvement of the popliteal fossa and distally along the posterior and medial leg the level of the ankle. The majority of the enhancement is seen on the delayed phases rather than on early arterial phases. No large flow-voids are visualized.The bladder is moderately distended with fluid. High T1 signal within the bowel likely represents meconium.
Vascular malformation involving the abdomen, pelvis, and left lower extremity as described above which may represent a hemangioma or mixed veno/lymphatic lesion. The findings would be atypical for an AVM.