Ewing sarcoma with residual pelvic mass Again noted is the residual pelvic mass situated between the bladder and rectosigmoid colon measuring 6 x 5.5 x 5.5 cm in the greatest transaxial and craniocaudal dimensions. The mass is stable in size and signal intensity compared to the prior examination and there is no evidence of enhancement following contrast administration. There is a peripheral rim of low signal intensity on T1 and T2-weighted images which may represent calcification. 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. A focus of low T1 and low T2 signal intensity is again seen in the left iliac bone which is unchanged. No abnormally enhancing foci are identified within the marrow.
Unchanged size and appearance of residual pelvic mass reflecting known Ewing's sarcoma. No findings to suggest disease progression.