Final answer:
Pyloromyotomy is the procedure that treats a congenital obstructed lesion found at the distal end of an infant's stomach, addressing the condition known as pyloric stenosis.
Step-by-step explanation:
The procedure that treats a congenital obstructed lesion at the distal end of an infant's stomach is known as pyloromyotomy. This surgical procedure involves cutting the muscles of the pylorus to allow food to pass more freely from the stomach to the small intestine. Pyloromyotomy is a surgical procedure that involves making an incision in the pyloric muscle to relieve the obstruction. This allows for improved passage of food from the stomach to the small intestine. The pylorus is the part of the stomach that connects to the small intestine, and this procedure specifically addresses the condition known as pyloric stenosis, where the muscles of the pylorus are abnormally thickened, preventing normal digestion and passage of stomach contents.