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Sagittal magnetic resonance images of the knee. (A, B) Sequential T1-weighted images of a cystic lesion with low signal intensity inferior to patella within the Hoffa's fat pad. (C, D) Sequential T2-weighted images, at the same level, of a well-demarcated, multilobular cystic mass with high signal intensity. Note the extrasynovial intra-articular location of the lesion.
