Bacillus Calmette-Guerins vaccination at birth causing tuberculous granulomatous lymphadenitis.

A rare but severe complication of Bacillus Calmette-Guerin (BCG) vaccination is the development of BCG disease, which can result in necrotizing granulomatous lymphadenitis. Symptoms can present as late as several months following the BCG vaccination. The key finding in BCG disease is the formation of caseating granulomas in draining lymph nodes; detection of BCG organisms from tissue samples are evident.