嗜鉻細胞瘤(pheochromocytoma) 以及副神經節瘤(paraganglioma) 是分泌兒茶酚胺 (cathecolamine) 的罕見神經性腫瘤。一位71 歲的男性病患，因腹痛、心悸、頭暈、頭痛就 醫，急診檢查發現一個5 公分大的後腹腔腫瘤而住院。該病患住院中喪失意識，經心肺復甦 急救後轉入加護病房，診斷為副神經節瘤引起的心肌炎所導致。嗜鉻細胞瘤及副神經節瘤可 能會以許多危及生命的心血管疾病做為表現，例如：急性心肌炎、心肌梗塞、以及高血壓危 症等。在後腹腔腫瘤的鑑別診斷當中，切不可輕忽。

Pheochromocytoma and paraganglioma are rarely seen cathecolamine-secreting neuroendocrine tumors. We reported a retroperitoneal tumor with a diameter of 5 cm in a 71 years old man. After admission, he was found loss of consciousness suddenly. Myocarditis related to pheochromocytoma was the most possible reason of sudden collapse. The diagnosis of paraganglioma was made later in ICU (intensive care unit). Pheochromocytoma or paraganglioma may present with life-threatening cardiovascular manifestations, such as acute myocarditis, myocardial infarction, and hypertensive emergency. It should never been neglected in the differential diagnosis of retroperitoneal mass lesions.