PMC4900987_01
44-year-old man with Hoffa's fat-pad inflamnation. Sagittal T2 fat-suppressed image of the right knee shows high signal in Hoffa's fat pad, prefemoral fat pad, and posterior soft tissues. High signal areas in the distal femoral diaphysis and proximal tibial diaphysis represent bone infarcts.
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T2 signal involving Hoffa's fat pad (Fig. 1) and replacement of normal high fat signal on proton-density-weighted images (Fig. 2). There was no discrete mass lesion or osseous component. A similar but smaller degree of high signal on fluid-sensitive sequences was also present in the prefemoral fat pad and in the posterior soft tissues (Figure 1, Figure 3). Avascular necrosis was seen in both the distal femoral shaft and proximal tibial shaft (Figure 1, Figure 4).
44-year-old man with Hoffa's fat-pad inflamnation. Axial T2 fat-suppressed image of the knee shows high signal involving the posterior soft tissues of the knee joint, subcutaneous fat posteromedially, and suprapatellar fat pad. A small joint effusion is also present.
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A similar but smaller degree of high signal on fluid-sensitive sequences was also present in the prefemoral fat pad and in the posterior soft tissues (Figure 1, Figure 3).
44-year-old man with Hoffa's fat-pad inflamnation. Coronal T2-weighted image of the knee shows serpiginous low-signal-intensity areas involving the distal femoral diaphysis and proximal tibial diaphysis. Findings are consistent with areas of osteonecrosis.
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Avascular necrosis was seen in both the distal femoral shaft and proximal tibial shaft (Figure 1, Figure 4).