Why These were Missed?

I've seen a few cases over the last week and I really have some thoughts to share:Case 1A 70 year-old man complained of progressive abdominal distension and went to a hospital. He was told to have "angin" in the abdomen and was discharged with Syr MMT (antacid).Case 2A 8 year-old boy complained of "abdominal discomfort". He was told to have "gastritis" and was discharged with Syr MMT, too.Case 3A