The increasing detection of asymptomatic gallstones leads to difficult decisions for the surgeon and patient about whether the stones should be managed expectantly or surgically. This review examines the evidence currently available upon which such decisions must be based. Gallstones may present as biliary pain, acute cholecystitis, biliary obstruction or pancreatitis, but it is not clear who will develop symptoms and what are the commonest initial symptoms. Studies of the natural history of silent gallstones suggest that a large majority of patients with such stones will remain asymptomatic. However, diabetics are at increased risk, as are patients whose stones are detected initially at laparotomy. Incidental cholecystectomy is usually safe, and preoperative detection by ultrasonic screening is an advantage in planning the operation. Prophylactic cholecystectomy is not indicated to prevent gallbladder carcinoma (except in cases of porcelain gallbladder) and there is conflicting evidence about whether cholecystectomy predisposes to colorectal carcinoma.

Ileosigmoid knotting carries a significant risk of mortality, and sigmoid resection should be considered for all patients with this unusual condition.

Typhoid perforation of the bowel carries a high risk of mortality and is a common surgical problem in many developing countries. This review examines the pathogenesis, and discusses diagnosis and management.

No abstract

The spread of drug-resistant organisms and increased international travel makes malaria a disorder of ever-increasing importance. This report reviews those aspects of malaria of surgical relevance. The importance of the spleen in host defence against malaria and other infections makes splenic preservation desirable whenever possible after rupture of the spleen. Tropical splenomegaly is caused by an abnormal immune response to malaria and is best managed medically. Careful selection of blood donors is essential to prevent transfusion malaria, and routine antimalarial prophylaxis is indicated for blood recipients in many endemic areas. The risk of postoperative malaria may justify chemoprophylaxis in certain patients.