Reason: Left posterior thigh soft tissue sarcoma, r/o recurrence History: above Metallic susceptibility artifact from the patient's right total hip arthroplasty and bilateral total knee arthroplasties limits evaluation of the surrounding soft tissues, particularly on the large field of view images. Again seen are postsurgical changes along the posteromedial aspect of the left thigh. The previously described elongated fluid collection along the posterior aspect of the thigh measures approximately 10 mm in diameter, previously 15 mm, likely representing a postoperative seroma. There is additional elongated fluid signal intensity extending superomedially to the level of the medial aspect of the upper thigh, appearing similar to the prior study, also likely representing seroma formation. There is a small amount of peritrochanteric inflammation which may be of no clinical significance.There is irregular curvilinear enhancing increased signal abnormality along the lateral aspect of the long head of the biceps femoris muscle at the level of the myotendinous junction which appears slightly more pronounced on today's examination when compared to the prior study (images 35 through 37; series 1201). There is no involvement of the underlying bone. While this may represent granulation tissue related to postsurgical change, the possibility of residual or recurrent tumor cannot be completely excluded. There is increased signal abnormality within the adductor musculature which is nonspecific. No bone marrow signal abnormality is identified.
Slight interval increase in the irregular curvilinear enhancing signal abnormality along the posterolateral aspect of the long head of the biceps femoris muscle at the level of the myotendinous junction. While this may represent granulation tissue related to prior surgery, close interval follow-up examination is recommended to exclude the possibility of residual or recurrent tumor.