In primary T.B. seen -
Primary T.B. includes.


An area of grey-white (size of approx. 1 - 1.50 cm) inflammatory consolidation - called ghon's focus.
Lymph node.
Lymphatics and lymphatic channel.


Cavity and fibrosis is seen in secondary T.B.
Ghon's focus
Pleural effusion
Miliary mottling
Fibrosis