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There is extensive soft tissue swelling noted at the proximal interphalangeal joint.
There is no opaque foreign body present.
The proximal and distal phalanges are abnormal, there is a lytic process involving the distal portion to the proximal phalanx, the body of the middle phalanx is destroyed, there is sparing of the interphalangeal joints.
The most likely diagnosis is either infiltration with sarcoid or tuberculous dactylitis.
A pyogenic infection is less likely.