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[Tumor of the omentum in 2 patients with a large, mobile mass in the upper abdomen].

A mobile mass in the right upper abdomen was felt in an 81-year-old woman with nausea and a 45-year-old man with exertional dyspnoea. Radiological investigations did not reveal sufficient information, whereupon laparotomies were carried out. In both cases, a tumour was found at the exit of the greater omentum. Following resection, the tumour recurred in the woman five months later, and she died as a result; the man made a rapid recovery and remained tumour-free two years later. Tumours originating in the omentum majus are rare. The presentation of these tumours is late, due to late presentation of complaints. These tumours are usually only detected once they reach a diameter of more than 10 centimetres. In general, it is difficult to establish whether the tumour is benign or malignant either pre- or peri-operatively. Surgery is the only curative option. A wide resection is preferable, with resection of any (parts of) organs which may be involved.