Purpose : To correlate the pathologic and MR findings of distal femoral cortical irregularity(DFCI) in adult. Materials and Methods : We retrospectively reviewed knee MR images of 120 adult patients(25-62 years old) without infection, tumor, or fracture. Five femoral specimens of adult cadaver were used to correlate patho-logic and MR findings. A ‘double cortical line ’on MR images was interpreted as DFCI, and MR findings were analyzed to determine the thickness, internal signal intensity, location of the DFCI, shape of the external cor-tex, and clarity of the inner cortex. The outer cortex was classified as either convex or flat, and the inner cortex was classified according to its thickness and continuity as one of three types. Results : One hundred and sixteen patients(97%) had DFCI, which in all cases was observed at the attach-ment site of the medial head of the gastrocnemius muscle. Mean thickness was 3.7mm and DFCI was thicker in men than in women(p
