Primary tumour resection in stage IV CRC increases the risk of postoperative complications. In the given setting, however, it results in an increased 2-year survival rate but it may not influence the 5-year survival rate. In patients with bi-lobar liver metastases resection of the primary tumour does not prolong survival time.

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Crohn's disease is a chronic bowel condition, which can present as a number of different clinical and pathological presentations, depending on localization and activity of the inflammatory process. The aethiology of the disease has not been explained. In each case the treatment should be individually tailored depending on the type of the changes. The indications for surgical intervention are continuous bleedings, recurrent ileus, perforation of the intestine, abscesses, fistulas, failure of pharmacological treatment, resistance to steroids and steroid dependence. In case of the mild type of the disease with few symptoms pharmacological treatment is the right choice In case of the mild type of the disease with few symptoms pharmacological treatment is the right choice process. In malign form of Crohn's disease lack of improvement after 7-10 days of intensive treatment is generally accepted indication for surgical treatment. Fulminant form of the disease is still a clear-cut indication for immediate surgical intervention. Decision on surgical intervention is more difficult and controversial when patient presents with series of subileus recurrences subsiding after conservative treatment. Patients with stenotic form of Crohn's disease usually require multiple operations most of which are bowel resections. Patients with stenotic form of Crohn's disease usually require multiple operations most of which are bowel resections therapy. External and internal asymptomatic fistulas should be treated conservatively. The timing of surgical treatment is essential in Crohn's disease however the prevention from recurrences is also fundamental. It is well proved that preventive administration of 5-ASA (especially mesalazine) and metronidazol can reduce the risk of early recurrences after surgery.

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