BACKGROUND: Although cases of tenosynovitis associated with foreign bodies are documented in the literature, there is no reported instance of the treatment of foreign body-associated tenosynovitis with ultrasound (US)-guided steroid injection. The use of corticosteroid injection under US guidance for flexor tenosynovitis associated with foreign bodies is a noteworthy subject.

CASE REPORT: In this case report, we present the contribution of US-guided targeted steroid injection to the treatment of flexor tenosynovitis of the third finger of the left hand associated with a foreign body.

DISCUSSION: The popularity of injections guided by US has increased in recent years. The success of injections performed under US guidance, including in small structures such as flexor tendons of the hand, cannot be overlooked. The functional use of US, including in small structures, presents a significant advantage for clinicians.

KEYWORDS: Ultrasound, hand pain, steroid injection, tenosynovitis, traumatic tenosynovitis