Presentation
Left hip pain.
Patient Data
Age: 30 years
Gender: Female
From the case:
Retroperitoneal desmoid tumor
Loading images...
Axial C+ portal venous phase
Very large extraperitoneal left pelvic mass displacing and in places indistinguishable from the iliopsoas and iliacus muscles, anteriorly displacing vasculature.
From the case:
Retroperitoneal desmoid tumor
Loading images...
Axial T2 fat sat
Large enhancing, T2-hyperintense left retroperitoneal mass encases the lumbosacral plexus and sciatic nerves. Displaces and likely invades portions of the iliopsoas and iliacus muscles.
Case Discussion
Ultrasound guided biopsy confirmed desmoid-type fibromatosis. Most cases of desmoid are intraperitoneal or abdominal wall masses, and an extra/retroperitoneal pelvic mass encasing nerves is a less common presentation.