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Findings, case of 48 y/o man, left toe mass

Imaging Findings

Bone scan
Radiographs
Magnetic resonance imaging
Resection specimen - third toe of left foot
Microscopy

Planar images show contamination in the area of the left sacrum. There is increased activity in a left toe. Spot views of the feet confirm the focally increased activity, most likely in the third or fourth toe on the left. Correlative plain films show an expansile, lytic lesion involving the proximal phalanx of the third toe. The overlying cortex appears to be intact. There is no clear matrix, obvious soft tissue mass, or periosteal reaction.

A T1-weighted MR image demonstrates nearly complete replacement of the marrow fat in the proximal phalanx. It is difficult to see if the overlying cortex is intact throughout. A fat-saturated image shows peripheral enhancement. The STIR image shows diffuse T2 hyperintensity that does extend beyond the contour of the bone.

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