prolapse of mitral leaflets二尖瓣瓣叶脱垂 progressive multifocal leukodystrophy进行性多病灶脑功能障碍,进行性多灶性脑白质营养不良 peripheral mononuclear leukocyte外周单核白细胞 polymorphonuclear leucocytes多形核白细胞 pulmonary microlithiasis肺小结石病