Fibrinous pleuritis

Severe pleuritis in a horse. Approximately 15 litres of serofibrinous fluid have been removed from the thoracic cavity, which pleural layers are completely covered with a thick coat of fibrin that conceals the heart. The loose fibrin plaques represent adherence points between the pleural layers that were ruptured during the opening of the thoracic cavity. A very small portion of a much congested lung is visible in the right-side image, near the right upper corner. Microbiological analysis revealed the presence of Streptococcus equi.

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