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The acute abdomen is a life threatening condition, its proper diagnosis and treatment is a great challenge until today in surgery. The authors aim to present the diagnostic difficulties in four cases of acute abdomen caused by large benign ovarian tumors. Vast majority of benign ovarian tumors are recognized accidentally through physical examination, X-ray and ultrasonography of the pelvis, abdominal operation is carried out for other reasons or investigations for acute abdominal pain. The case history, physical examination and radiological procedures do not always lead to the correct diagnosis. The authors diagnosed the disease through laparotomy, and an adequate operation was carried out subsequently. Following the operation, all four patients left the hospital in good condition.

Primary malignancies in the small intestine are relatively rare. There are no specific methods to find these tumours in early stage. The authors report a case of a primary T-cell lymphoma in the small bowel that caused diagnostic challenges. A 66-year-old woman presenting with abdominal pain and and a palpable mass in the left upper quadrant of her abdomen was admitted into the hospital. Blood tests, endoscopic examinations, ultrasonography and CT scan could not reveal a definitive diagnosis. While a small bowel follow through examination demonstrated an entero-enteral fistula, its exact position could not have been determined. Consequently, an exploratory laparotomy was carried out, and a tumour was found involving the small bowel loops. The involved portion of the small intestine (with the fistula) was resected, and a side-to-side small bowel anastomosis was performed. Histological and immunohistochemical analyses revealed a primary T-cell lymphoma of the small bowel. There was no evidence of metastatic disease at the time of surgery. The patient received adjuvant chemotherapy, but three months later multiple lung metastases were detected. Small bowel malignant tumours cause significant diagnostic difficulties. Therefore, diagnosis and adequate treatment are usually delayed for some weeks. In the future, capsule endoscopy could help in the diagnostic work-up. Nevertheless, surgical exploration and resection of the tumour will be necessary for the correct diagnosis and treatment.

The posterior mediastinum is the usual location of enteric cysts. They can be located at any part of the posterior mediastinum adjacent to the oesophagus, but communication with that structure is rare. Approximately 60 percent of the cysts occur in infants less than one year of age, and symptoms of tracheal or oesophageal obstruction are common. The cysts usually contain clear, colorless mucoid fluid. The authors describe here a successfully treated enteric cyst with an unusual, retroperitoneal location, which presented in an adult.