Macroscopic basis of an early stage was a large cavity of destruction with insufficient spontaneous draining, indistinctly separated from surrounding lung tissue and filled with purulent exudate and sequesters. On bioplasm nls image it was comparable with a large abscess of heterogeneous structure due to diffuse distribution of lesser achromogenic air signals against the background of prevailing moderately chromogenic content with coarse suspended matter and possible hypochromogenic sequesters. Irregular shape and uneven contours of a nidus, indistinct in spots inflammatory infiltration of surrounding lung were typical. Destruction cavity is limited by pulmobary tissue without chromogenic walls.