Pathology Education Instructional Resource

File:IPLab1Tuberculosis3.jpg

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This gross photograph shows hilar lymph nodes from another patient with disseminated tuberculosis. The white, cheesy-appearing nodules (arrows) in the lymph nodes give rise to the descriptive terminology of caseous necrosis. The black pigment in the lymph nodes is anthracotic pigment that has drained from the lungs.

Disseminated tuberculosis refers to the hematogenous spread of tuberculous lesions throughout the body. It is also known as miliary tuberculosis (which is so-called because the lesions resemble millet).

Caseous means cheesy.

Anthracotic pigment is coal dust deposited in the lungs--it is seen in coal miners, city-dwellers, and smokers.

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