Fetal MRI, evaluate for changes in fetal lymphangioma of pelvis and left thigh PELVIS:UTERUS, ADNEXA: Gravid uterus consistent with 34 week gestation. Posterior thigh T2 hyperintense mass involves the sacrum and left pelvis /retroperitoneum proximally and extends distally to the knee with subtle involvement of the lower leg. Internal heterogeneity may be be due in part to septations or flow voids. The mass measures up to 24 mm in maximal thickness at the buttock. Otherwise, no fetal abnormalities are noted.BLADDER: No significant abnormality noted.LYMPH NODES: No significant abnormality noted.BOWEL, MESENTERY: No significant abnormality noted.BONES, SOFT TISSUES: No significant abnormality noted.OTHER: No significant abnormality noted.
T2 hyperintense mass involving the sacrum, left retroperitoneum / pelvis / buttock, posterior left thigh, and lower leg suggestive of lymphangioma or hemangioma.