PMC7355715_01
MRI of the right thumb showing osteomyelitis and tenosynovitis before treatment (A, B) and improvement four months after therapy (C, D).
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Subsequently, an MRI of the right hand showed focal cortical destruction along the radial aspect of the proximal right thumb phalanx with extensive edema and enhancement with the bone and adjacent soft tissues without fluid collection (Fig. 1). Follow up MRI of the right thumb four months after completion of penicillin therapy revealed interval improvement in the proximal first phalanx osteomyelitis, with resolution of flexor pollicis longus tenosynovitis (Fig. 1).