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Adverse effects of screening procedure (e.g. stress and anxiety, discomfort, radiation exposure, chemical exposure). Stress and anxiety caused by prolonging knowledge of an illness without any improvement in outcome. This problem is referred to as overdiagnosis (see also below). Stress and anxiety caused by a false positive screening result.
False reassurance from false negative findings, over-diagnosis, short term anxiety or distress, and increased rate of incidental findings are other risks. [10] The currently used low dose CT scan results in a radiation exposure of about 2 millisieverts (equal to roughly 20 two-view chest x-rays). [11]
The radiation used in CT scans can damage body cells, including DNA molecules, which can lead to radiation-induced cancer. [148] The radiation doses received from CT scans is variable. Compared to the lowest dose X-ray techniques, CT scans can have 100 to 1,000 times higher dose than conventional X-rays. [149]
A CT scan revealed intussusception, a rare disorder in which part of the large intestine telescopes into itself, cutting off blood flow. During emergency surgery, doctors discovered a benign tumor ...
An endoscopy can examine the esophagus, stomach and part of the small intestines, and CT scans may be used to check for tumors or structural abnormalities in the head, neck or chest.
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