28-year-old female patient status post resection of pelvic schwannoma. Evaluate postsurgical changes. ABDOMEN:LIVER, BILIARY TRACT: The common bile duct is prominent in diameter but smoothly tapers distally without evidence of a distal obstructing lesion, unchanged.SPLEEN: No significant abnormality noted.PANCREAS: No significant abnormality noted.ADRENAL GLANDS: No significant abnormality noted.KIDNEYS, URETERS: Mild bilateral pelvocaliectasis with bilateral ureteral stents noted.RETROPERITONEUM, LYMPH NODES: There are two enhancing nodules within the left retroperitoneum posterior to the left psoas muscle measuring up to 1.3 cm (image 83, series 1103), which are stable.BOWEL, MESENTERY: No significant abnormality noted.BONES, SOFT TISSUES: Susceptibility artifact from lumbosacral orthopedic fixation hardware. Post-surgical changes of the midline abdominopelvic ventral wall. OTHER: There are prominent periaortic lymph nodes within the chest. PELVIS:UTERUS, ADNEXA: No significant abnormality noted.BLADDER: Bilateral ureteral stents. LYMPH NODES: No significant abnormality noted.BOWEL, MESENTERY: No significant abnormality noted.BONES, SOFT TISSUES: Susceptibility artifact from lumbosacral orthopedic hardware limits evaluation of pelvic bony structures. Post-surgical changes in the left hemipelvis with a T2 hyperintense collection with peripheral thick enhancement within the surgical bed measuring 5.5 x 9.2 x 9.7 cm. Foci of susceptibility artifact within this collection are compatible with foci of air as seen on prior CT. Enhancing tissue is present along the inferior margin of the surgical bed and is invading the left sacrum, as seen on prior studies, compatible with residual tumor (image 82, series 1901). OTHER: No significant abnormality noted.
Post-surgical changes in the left hemipelvis with a large thick walled fluid collection within the surgical bed and enhancing soft tissue along the posterior margin compatible with residual tumor; this may represent an evolving post-operative seroma though abscess is not excluded in the appropriate clinical context.