<prompt> Answer this question truthfullyWhat is the purpose of undergoing a CT scan for thyroiditis at Riedels?  <response>: <reason> CT scan may be helpful in the diagnosis of Riedels thyroiditis. Findings on CT scan suggestive of Riedels thyroiditis include hypodense infiltrative mass, invasion of nearby soft tissues, compression of the trachea, and esophageal compression. 