Visual examination of the sigmoid colon is performed in which department?

The visual examination of the sigmoid colon is performed in the endoscopy department because this area specializes in procedures that involve the direct visualization of internal organs using an endoscope. A sigmoidoscopy, for example, is a specific type of endoscopic procedure that allows for the examination of the sigmoid colon and part of the rectum. This procedure requires specialized equipment and trained personnel to ensure both the accuracy of the examination and the safety of the patient.

Other departments listed, such as radiology and laboratory, do not focus on direct visualization through an endoscope. Radiology typically involves imaging techniques like X-rays, MRIs, or CT scans, which do not allow for direct observation and intervention. The laboratory deals with the analysis of biological samples rather than visual examinations of internal organs. Cardiology focuses on the heart and its related conditions, making it unrelated to procedures involving the sigmoid colon. Thus, endoscopy is the appropriate department for this type of examination.