內臟真動脈瘤及偽動脈瘤是不常見的疾病，有報導其盛行率約為百分之0.1到0.2，最常發生在脾或肝動脈，大部分的內臟動脈瘤並無明顯症狀，常見的症狀為疲倦、腹痛、噁心或嘔吐。非特異性的臨床表現常會導致延遲診斷。在懷疑的病人身上，需安排超音波及橫斷式腹部血管掃描幫助診斷。本病例報告介紹了一個以急性持續性腹痛為臨床表現的巨大脾動脈瘤個案。

Visceral artery true aneurysm (VAA) and visceral artery pseudoaneurysm(VAPA) are rare with a reported incidence of 0.1 to 0.2 percent. The most commonly involved arteries were splenic artery and hepatic artery. Most VAAs and VAPAs are asymptomatic. The most common symptoms are malaise, vague abdominal pain, and nausea or vomiting. Their nonspecific symptoms and signs may cause a delay in diagnosis. Ultrasonography and cross-sectional abdominal vascular image is required for patient in whom the diagnosis is suspected. This report presents a case of giant splenic artery true aneurysm with presentation of acute onset of persistent severe abdominal pain.