focus

[fo´kus] (pl. fo´ci) (L.)

1. the point of convergence of light rays or sound waves.

2. the chief center of a morbid process.

Ghon focus the primary parenchymal lesion of primary pulmonary tuberculosis in children; when associated with a corresponding lymph node focus, it is known as the primary or Ghon complex. Called also Ghon tubercle.

grid focus in radiology, a determination made by drawing an imaginary line from the outside of the width of the grid to where it intersects with a centering point. Called also grid radius.

Ghon tu·ber·cle

(gon),

calcification seen in pulmonary parenchyma (usually midlung) resulting from earlier, usually childhood, infection with tuberculosis; sometimes confused with a combination of parenchymal lesion and calcified lymph node, which is properly termed a Ranke complex.

Synonym(s): Ghon complex, Ghon focus, Ghon primary lesion

Farlex Partner Medical Dictionary © Farlex 2012

Ghon tu·ber·cle

, Ghon complex , Ghon focus (gon tū'bĕr-kĕl, kompleks, fōkŭs)

Calcification seen in pulmonary parenchyma (usually midlung) resulting from earlier, usually childhood, infection with tuberculosis; sometimes confused with a combination of parenchymal lesion and calcified lymph node, which is properly termed a Ranke complex.

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

Ghon,

Anton, Czech pathologist, 1866-1936.

Ghon complex - Synonym(s): Ghon tubercle

Ghon focus - Synonym(s): Ghon tubercle

Ghon lesion

Ghon node

Ghon primary lesion - Synonym(s): Ghon tubercle

Ghon tubercle - calcification seen in pulmonary parenchyma and hilar nodes resulting from earlier infection with tuberculosis. Synonym(s): Ghon complex; Ghon focus; Ghon primary lesion

Ghon-Sachs bacillus - Synonym(s): Sachs bacillus