Miliary tuberculosis of the lungs
- Peribronchial are found unevenly scattered granulomas the size of the millet grain (milium).
- In some of them dominate a central caseous necrosis area, and in others the necrosis is scant and surrounded by cells with bean shaped, vesicular nuclei. Because of their resemblance with the covering epithelium, these macrophages are called epitheloid cells.
- Between them are found giant Langhans cells , with lots of nuclei, arranged as a ‘horseshoe’, open to the area with necrosis.
- Peripheral rim of single lymphocytes (L) with no capillaries around.