Presentation
Trivial trauma followed by pain.
Patient Data
An expansile lytic lesion with a narrow zone of transition, endosteal scalloping, and chondroid matrix is seen involving the metadiasphyseal region of the 4th metacarpal.
Associated cortical breach and pathological fracture are seen.
No periosteal reaction is seen.
An expansile lytic lesion with a narrow zone of transition, endosteal scalloping, and chondroid matrix is seen involving the metadiasphyseal region of the 4th metacarpal.
Associated cortical breach and pathological fracture are seen.
No periosteal reaction is seen.
An expansile lesion with endosteal scalloping is seen in the 4th metacarpal. Matrix of the lesion shows calcification. No soft tissue is seen growing outside the bone. Pathological fracture is present.
On post-contrast images there is enhancement is seen along the scalloped margins.
Case Discussion
Findings that favor the diagnosis of enchondroma over low-grade chondrosarcoma are:
young age
involvement of small bones (metacarpal)
the small size of the lesion
endosteal scalloping involves less than 2/3 of cortical thickness
absence of permeative bone destruction
soft tissue does not extend beyond the bone
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