Point-of-care ultrasound diagnosis of flexor tenosynovitis caused by an unusual pathogen

Skin and soft tissue infections are commonly encountered in the emergency department and are typically caused by common gram-positive bacteria. In the immunocompromised patient, however, infections from unusual pathogens should also be considered. We describe the case of a 66-year-old male with a history of renal transplant who was diagnosed with flexor tenosynovitis by point-of-care ultrasound. Although initial wound cultures were negative, subsequent microbiological testing led to the underlying cause, a nontuberculous mycobacterial infection.