A large lobulated lesion, now clearly seen to be lying in the enlarged redundant popliteal recess of knee joint, splaying the medial head of gastrocnemius and semimembranosus. The internal matrix is heterogenous predominantly mottled hyperintense signal on T2 weighted and hypointense signal on T1 weighted sequences, margins are well defined, and there's no intraosseous or intramuscular extension suggesting a benign calcified mass.
The radiological diagnosis was solitary giant intrasynovial loose body of popliteal recess of knee.