Fig. 3

Typical case 3; A 40-year-old man who smokes one pack per day presented with a neck mass and low-grade fever that had persisted for a month. Upon examination, the patient was found to be neurologically intact. A CTA examination was conducted, which revealed an unruptured aneurysm in the left ECCA (A-B). Further investigation through a cerebral angiogram revealed a large aneurysm (19.0 mm in maximum diameter) on the extracranial internal carotid artery (C). After an incisional neck biopsy and pathological examination, it was determined that the patient had an infected aneurysm (D-E). Anti-infection treatment was then administered, and a CTA re-examination was conducted one month later. The results showed that the aneurysm had disappeared and the parent artery had become thinner (F)