Abstract: Fish stab wound granuloma is a granulomatous injury caused by Mycobacterium marinum infection after a fish stab wound. The upper limbs are the most common site of infection. Usually, the reported cases are mostly nodules and erythema on the skin surface. It is rare to involve deep structures such as tendons, bones, and joints. Two cases of tenosynovitis caused by Mycobacterium marinum infection are reported.

Key words: fish stab wound granuloma, tenosynovitis, deep infection