LYMPHADENITIS
,• Commonest form of extrapulmonary TB
• Organism:Mycobacterium tuberculosis
• SITES:
Common in neck lymphnodes-80%
Upper deep cervical-54%
Bilateral -20%
, PATHOGENESIS
• Mode of infection:Tonsils(jugulodigastric),adenoids(posterior
triangle)
• Infection reach subcapsular sinus-lymphnode cortex
containing lymph follicles
• Matting due to periadenitis involving subcapsular sinus
• May be associated with pulmonary or renal TB.Through blood
reaches medulla of lymphnode
• Rarely:Sibsons fascia to supraclavicular lymphnodes