A 26-year-old man presented with sudden onset of severe pain in the legs and inability to move the left leg. On physical examination, he had complete loss of motor function in the left leg. Bedside ultrasonographic examination with color Doppler showed no blood flow in the distal aorta. Computed tomographic angiography of the abdomen revealed a saddle embolus at the aortoiliac junction (left). Emergency aortoiliac embolectomy was performed, and a gelatinous mass was removed. A subsequent transthoracic echocardiogram identified a heterogeneous mass in the left atrium (middle). On hospital day 2, cardiothoracic surgery was performed to remove the left atrial mass, and a villous, friable lesion was excised (right). Histopathology of the cardiac mass showed abundant mucopolysaccharide matrix with scattered nests of lepidic cells. What is the diagnosis?
一名26岁男性患者突发严重的腿部疼痛，并且左腿无法活动。体格检查显示左腿完全丧失运动功能。床旁彩色多普勒超声检查显示远端主动脉无血流。腹部计算机断层血管造影显示主动脉分叉处有骑跨性栓子（左图）。紧急行主动脉 – 髂动脉取栓术，术中取出一胶冻状肿块。随后的经胸超声心动图发现左心房有一不均质肿块（中图）。入院第2天，行心胸外科手术切除左心房肿块，术中切除一绒毛状、质脆的病变（右图）。心脏肿块的病理组织学检查显示有丰富的黏多糖基质，其中散布着呈贴壁生长的细胞巢。诊断是什么？
A. Cardiac myxoma心脏黏液瘤
B. Cardiac sarcoma心脏肉瘤
C. Intracardiac thrombus心内血栓
D. Marantic endocarditis非细菌性血栓性心内膜炎
E. Papillary fibroelastoma乳头状弹力纤维瘤
答案解析：
检查结果与心脏黏液瘤相符。最终诊断为因左心房黏液瘤脱落导致急性腹主动脉闭塞。为排查是否患有与心脏黏液瘤相关的遗传性癌症综合征——卡尼综合征（Carney complex），安排了基因检测，但患者未完成该检测。
正确答案：A
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