Papulonecrotic tuberculid secondary to Mycobacterium bovis.
A patient with papulonecrotic tuberculid had a pruritic papular eruption associated with constitutional symptoms. The eruption flared whenever the patient received low doses of prednisone to control symptoms of temporal arteritis. A cervical lymph node biopsy specimen demonstrated acid-fast bacilli, and Mycobacterium bovis grew on the cultures. The eruption cleared completely with antituberculous therapy. This case demonstrated the clinicopathologic findings compatible with a diagnosis of papulonecrotic tuberculid. Skepticism regarding the existence of papulonecrotic tuberculid is probably a result of the current decreased prevalence of untreated tuberculosis, and the subsequently increased rarity of this entity.
D000368:Aged; D001706:Biopsy; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D009163:Mycobacterium bovis / Q000302:isolation & purification; D009336:Necrosis; D012867:Skin / Q000473:pathology; D014382:Tuberculosis, Cutaneous / Q000175:diagnosis* / Q000382:microbiology / Q000473:pathology; D018366:Vasculitis, Leukocytoclastic, Cutaneous / Q000175:diagnosis