External carotid artery pseudoaneurysm in an immunocompromised patient.

arteries are rare and are generally atherosclerotic in nature. In adults, infected or mycotic aneurysms are unusual and are most often due to systemic sepsis and bacteremia. The commonest infecting organisms are Staphylococcus, Streptococcus, Klebsiella, Escherichia and Salmonella. In children, tonsillitis and pharyngeal abscesses are more common and can cause vascular complications including thrombophlebitis of the internal jugular vein (Lemierre’s syndrome) and extracranial carotid pseudoaneurysms. We report a soft tissue infection of the neck in an immunocompromised adult secondary to a rare complication of dermatitis herpetiformis treated with diamino-diphenyl sulphone (dapsone).