Juxtacortical chondroma

Discussion:

MRI of right thumb showed well-defined PDW hyperintense juxtacortical lesion along the medial surface of proximal phalanx with thinned-out and intact underlying cortex. CT sections of the lesion showed faint peripheral wall calcifications. Mild surrounding inflammatory soft tissue edema was seen. These features were suggestive of juxtacortical chondroma. 

The patient underwent surgical excision of the lesion. Histopathology showed a benign lesion comprised of lobules of mature chondroid areas surrounded by sparse spindle cells and mature bony trabeculae. Histopathological features were consistent with juxtacortical (periosteal) chondroma,

Juxtacortical chondromas are benign cartilaginous tumors arising within the periosteum. It is commonly seen in young patients.

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