31 year old female with a history of pelvic soft tissue sarcoma status post resection on 8/22/2014 and radiation therapy on 1/9/15. Presents with improving low back pain radiating to the left leg. PELVIS:UTERUS, ADNEXA: No significant abnormality noted.BLADDER: No significant abnormality noted.LYMPH NODES: No evidence of lymphadenopathy.BOWEL, MESENTERY: No significant abnormality noted.BONES, SOFT TISSUES: The left piriformis muscle is uniformly enlarged with associated decreased signal abnormality, appearing less pronounced when compared to the prior study. Additionally, there is a focus of enhancement measuring 12 x 8 mm within the left piriformis muscle appearing similar to the prior study (102; series 1402). No additional foci of abnormal enhancement are identified. OTHER: No significant abnormality noted.
1.Focus of enhancement in the left piriformis muscle, suspicious for residual or recurrent disease. 2.There is enlargement and signal abnormality of the left piriformis muscle, which appears decreased in size when compared to the prior study. This is nonspecific and may represent post operative change although residual disease is not completely excluded and follow up examination is recommended. 