Fibrotic pleura with extensively ulcerated mesothelium and replacement by fibrinous deposits, capillary proliferation, interstitial hemorrhage and marked infiltration by lymphocytes, plasma cells and many neutrophils, cell debris with and related dense fibrosis. No evidence of granulomatous inflammation. No evidence of malignancy.
Empyema.
Soft tissue fragments collectively measured 5.5x5x1 cm, totally embedded.
Pleural, biopsy: