Semimembranosus-MCL bursitis:
Anatomy
Present with medial knee pain (c.f. pain and tenderness in pes anserinus bursitis is more superior and posterior
MR: fluid collection around semimembmanosus. Differentials include perimeniscal cyst, ganglion cyst, popliteal cyst, dissected joint fluid, pes anserinus bursitis.
References:
Rothstein CP et al.Semimembranosus-tibial collateral ligament bursitis: MR imaging findings. AJR Am J Roentgenol 1996; 166:875–877
