Table 1.

Clinical synopses

Case 1 with soft tissue sarcoma of lower extremity
55-year-old male with 16 cm mass in the posterior aspect of right distal thigh. The core needle biopsy of this lesion demonstrated a high-grade round cell liposarcoma. The clinical stage (AJCC) is III T2bN0M0G3
Description of the diagnostic MRI of right distal thigh: A large well circumscribed heterogeneous, multiloculated mass located within the posterior distal thigh. The tumor measures 14.8 cm in craniocaudad dimension, 7.8 cm in AP dimension, and 11.3 cm in maximal medial-lateral dimension. There is a small loculated component located at its midaspect, anterolaterally, which measures 2.4 × 1.2 cm. There is irregular and discontinuous enhancement lining this mass which appears slightly less intense and less nodular when compared to the prior study. There are multiple thin enhancing septae traversing this mass as well. Overall the enhancing component of this mass is estimated to represent less than 10% of the mass volume. The anterior margin of this mass abuts the posterior margin of the popliteus artery for several centimeters along its course. This mass abuts the posterior tibial and common peroneal nerves which are deviated laterally. This mass has a large area of contact with the semimembranosis muscle and focally abuts the semi tendinosis muscle. There is a distinct fat plane between this mass and the biceps femoris muscles.
There is mild increased signal within the inferior aspect of the vastus medialis muscle and a tiny amount of fluid along its medial margin. These findings have not significantly changed from prior study and are nonspecific. Incidental note is made of degenerative disease involving the patellofemoral joint.
The patient underwent a simulation CT scan in a supine position with right thigh (affected thigh) straight and left thigh (unaffected thigh) in frog leg position, and then MR of right thigh in the same position as for the simulation CT scan.