Here is the labelled image with the main pathological focus marked:

The red circle and arrow mark the Caseous Necrosis (Main Focus) - the area of firm, cheese-like (caseous) necrotic lung tissue visible in the upper-central portion of the specimen. This is the hallmark lesion of caseous pneumonia (казеозная пневмония), a severe form of tuberculosis where the lung parenchyma undergoes coagulative necrosis that takes on a dry, crumbly, cheese-like appearance due to the granulomatous inflammatory response to Mycobacterium tuberculosis.

You can also download the file here: