Cancer
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The primary curative therapy for colorectal cancer is surgical resection. In addition, surgery is the mainstay for palliative therapy in most patients with more advanced colorectal cancer. ⋯ These medical problems may be secondary to the carcinoma, such as obstruction, perforation with sepsis, or malnutrition, or may be a result of underlying disorders, especially cardiopulmonary diseases. Adequate evaluation and indicated therapeutic intervention before surgical procedures will improve the patient's outcome.