Figure 4From: Acute fibrinous and organizing pneumonia masquerading as a lower respiratory tract infection: a case report and review of the literature Histopathology of the lung biopsy. Panel A shows multiple organizing “fibrin balls” within alveolar spaces without associated hyaline membrane formation. Variable areas of spindle cells fibroblastic proliferation were also seen with focal type II pnuemocyte hyperplasia, the latter being depicted by the black arrows in panel B.Back to article page