结核分枝杆菌：抗酸染色 免疫荧光 脾粟粒性肉芽肿性炎（大体） 肠系膜上淋巴结 巨噬细胞内见鸟型分枝杆菌
The lymph nodes in this mesentery, best seen at the left, are enlarged and have cut surfaces that appear yellow-tan. These nodes are filled with sheets of Mycobacterium avium-complex (MAC) organisms, and the immune response is so poor in this AIDS patient that there is no focal granuloma formation.