How a CT scan caused a body-wide rash and fever: case 

The elderly man had acute liver and renal injury, as well as lesions covering most of his body

Doctors have stressed the importance of intradermal testing to identify uncommon causes of drug reactions, after a CT scan resulted in a patient developing fever and itchy lesions across his body. 

Their 84-year-old patient had previously tolerated iodinated contrast media (ICM) and had no history of drug allergies or underlying medical conditions other than prostate cancer.

Yet a week after the scan, he returned to doctors showing signs of a severe non-immediate allergic reaction to ICM ioversol.

He was subsequently diagnosed with drug reaction with eosinophilia and systemic symptoms, or DRESS syndrome.