Simon focus
Encyclopedia
A Simon focus is a tuberculosis
(TB) nodule that can form in the apex of the lung
when a primary TB infection elsewhere in the body spreads to the lung apex via the bloodstream. Simon focus nodules are often calcified.
Tuberculosis
Tuberculosis, MTB, or TB is a common, and in many cases lethal, infectious disease caused by various strains of mycobacteria, usually Mycobacterium tuberculosis. Tuberculosis usually attacks the lungs but can also affect other parts of the body...
(TB) nodule that can form in the apex of the lung
Lung
The lung is the essential respiration organ in many air-breathing animals, including most tetrapods, a few fish and a few snails. In mammals and the more complex life forms, the two lungs are located near the backbone on either side of the heart...
when a primary TB infection elsewhere in the body spreads to the lung apex via the bloodstream. Simon focus nodules are often calcified.