脾動脈本幹の真性動脈瘤に対する動脈塞栓後に自然退縮した未治療の脾動脈分枝動脈瘤の1例

抄録

A 50-year-old Japanese male experienced a rare true aneurysm in the distal splenic artery that showed spontaneous regression after embolization for the aneurysm in the proximal splenic artery. Abdominal contrast-enhanced CT incidentally demonstrated a saccular aneurysm in the main trunk of the splenic artery and a fusiform-type aneurysm at the splenic hilum. Because the aneurysm in the main trunk of the splenic artery showed a slight increase on follow-up CT performed 2 months post-discharge, we considered it a therapeutic indication. We performed coil embolization for the aneurysm in the main trunk of the splenic artery using the isolation and packing technique and chose not to treat the aneurysm in the splenic hilum. Observation by serial CT was performed over 1 year after treatment, and CT showed no recurrence of the treated aneurysm in the main splenic artery. On the other hand, the untreated splenic aneurysm at the splenic hilum gradually shrunk and eventually disappeared, with thrombus formation.