We have found the Mini-Light Illuminator (Medgeneral, Minneapolis, Minnesota) extremely useful in our neonatal intensive care unit for the early detection of pneumothorax, pneumomediastinum, and developing hydrocephalus; for defining some abdominal masses; and for following the removal of extrapulmonary air. The initial article about the Mini-Light by Kuhns et al. (Pediatrics 56:355, September 1975) suggested the possibility of bacterial contamination. More recent correspondence (Pediatrics 57:975, June 1976) from them further noted a potential thermal hazard.