Arm Epidermoid Cyst on POCUS Ultrasound Patient presents with right arm pain and focal swelling. Diagnosis? Answer: Epidermoid cyst - benign skin lesion with keratin material from thin layer of squamous epithelium. Twinkle artifact is a specific sonographic finding. - MH_EMUltrasound @MH_EMultrasound #Epidermoid #Cyst #POCUS #Ultrasound #clinical #twinkle