SAIO implies incomplete obstruction. It is one of the important causes of morbidity and mortality in the surgical practice. The latter is true in patients presenting as sub-acute intestinal obstruction (SAIO) with atypical features that cause delay in diagnosis. Diagnosis is difficult, and in about 50% of cases it is made intra-operatively. Delayed diagnosis, co-morbidities and advanced age are the causes of the high related mortality rate (7.5-15%).
Fistula, Gall stones, Sub-acute intestinal obstruction, Vomiting