Single-digit flexor tenosynovitis

Flexor tenosynovitis may present with an isolated swollen and inflamed digit that resembles dactylitis (‘sausage digit’). Always consider infection in anyone who presents with a single-digit dactylitis, particularly in the setting of a preceding skin breach, puncture or bite wound to the hand. Refer urgently to a hand surgeon if infection is suspected. Differential diagnoses for a single-digit dactylitis (‘sausage digit’) lists the differential diagnoses for a single-digit dactylitis. It is important to recognise this presentation as a potential closed-space infection that can lead to tendon disruption. In subacute presentations, consider chronic infection, such as mycobacterial infection.