A patient with a facial thermogram indicative of poor circulation in the carotid tree had normal appearing extracranial arteries at the time of angiography. Retinal arterial microemboli were present, suggesting that microembolic episodes may have been responsible for the positive thermogram and for certain "false-positive" thermograms in prior reports.
Capistrant TD, Gumnit RJ. Thermography Following a Carotid Transient Ischemic Episode. JAMA. 1970;211(4):656–657. doi:10.1001/jama.1970.03170040060016
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