Because they are frequently malignant, swellings of the chest wall during infancy are alarming lesions. Sternal osteomyelitis is a rare condition that may present with a chest wall mass locating in the parasternal region. A parasternal mass of granulomatous osteomyelitic origin is an extremely rare cause with only few case being reported to date. Herein, the authors report on 2 infants presenting with parasternal masses of sternal granulomatous osteomyelitic origin and discuss the possible etiologic role of the bacillus Calmette-Guerin vaccine. J Pediatr Surg 34:1534-1536. Copyright (C) 1999 by W.B. Saunders Company.