PMC9294257_01
Left Knee MRI: Joint effusion illustrating a 6 x 4 x 5 cm inflammatory mass identified within Hoffa's fat pad. Moderate to severe cartilage loss also observed with necrotic bone in the tibial plateau.
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Fig. 1, suggested infectious arthritis. Fungal cultures of his blood and cerebral spinal fluid were negative although serum Cryptococcal antigen was positive.
Intraoperative picture of his left knee: Fistula noted on the medial aspect of the patellar tendon communicating with the anterior medial tibial plateau rim. Granuloma tissue can also be seen infiltrating the prepatellar bursa.
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Fig. 2 shows an intraoperative picture.