Reason: Ewings' sarcoma, off therapy for 2.5 years History: none Again seen is the reference pelvic mass situated between the bladder and rectosigmoid colon measuring approximately 6.2 x 5.5 cm, previously 6.2 x 5.5 cm (image 30; series 12), not significantly changed. There is no enhancement on postcontrast images. There is a peripheral rim of low signal intensity on T1 and T2-weighted images. While this is nonspecific, this may represent postsurgical change/chronic hematoma formation. No additional enhancing mass lesions are identified. There is heterogeneous bone marrow signal abnormality within the lumbar spine which may represent residual islands of red marrow. Again seen is a small nonenhancing focus of T2 signal abnormality on T1-weighted images within the left iliac bone, unchanged, which may represent a treated metastases. Again seen is an enhancing focus of signal abnormality within the anterior aspect of the left sacral wing which appears slightly decreased in size when compared to the prior study and likely represents a small focus of bone infarct.
No significant interval change in post treatment changes of pelvic Ewing's sarcoma. No findings to suggest disease progression.