Refractory tenosynovitis with ‘rice bodies’ in the hand due to Mycobacterium intracellulare

A 76-year-old man presented with a 2-month history of swelling and tenderness of the left thumb and thenar. The patient had type 2 diabetes mellitus. He had been bitten by a dog on the left hand 1 year previously, and the wound had healed without treatment. He was initially diagnosed with non-infectious tenosynovitis and received steroid injections repeatedly (Fig. 1a). Thereafter, open diagnostic-drainage was performed, and the presence of ‘rice bodies’ was visually noted in the hand (Fig. 1b). * Naoki Hasegawa [email protected]