We carried out a detailed study of bioplasm picture of gangrenous abscesses in order to optimize treatment tactics and found that along with above mentioned signs, they had certain peculiarities of bioplasm-picture. The most typical symptom were sequesters of necrotic lung tissue. They represented fragments of necrotic lung, rejected due to purulent-destructive process and separately located in a cavity of destruction. At bioplasm image sequesters looked like moderately chromogenic areas of irregular shape, with uneven and sometimes indistinct contours located inside abscess cavity and to related to surrounding lung tissue. They were characterized by moderate chromogeneity and stood out against a background of hyperchromogenic content. Sequesters were sized, as a rule, less than 2cm, but sometimes larger fragments were detected.