A 1-year-old boy had acute gastric outlet obstruction, the cause of wh
ich was a prepyloric submucosal mass. The mass and the ulcerated overl
ying mucosa were excised. The histological diagnosis was leiomyoblasto
ma with parenchymatous hemorrhage. Apparently, he is the youngest pati
ent reported to have this disease. Copyright (C) 1994 by W.B. Saunders
Company