General pathology - inflamation

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purulent exudate, pericardial cavity ,gross

Here is a purulent exudate in which the exuded fluid also contains a large number of acute inflammatory cells. Thus, the yellowish fluid in this opened pericardial cavity is a purulent exudate.

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Purulent exudate, acute meningitis,gross

A purulent exudate is seen beneath the meninges in the brain of this patient with acute meningitis from Streptococcus pneumoniae infection. The exudate obscures the sulci

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Purulent exudate, acute peritonitis,gross

The abdominal cavity is opened at autopsy here to reveal an extensive purulent peritonitis that resulted from rupture of the colon. A thick yellow exudate coats the peritoneal surfaces. A paracentesis yielded fluid with the properties of an exudate: high protein content with many cells (mostly PMN's).

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Acute bronchopneumonia , microscopic

The PMN's seen here are in alveoli, indicative of an acute bronchopneumonia of the lung. The PMN's form an exudate in the alveoli. This patient had a "productive" cough because large amounts of purulent sputum were produced. The source, the neutrophilic alveolar exudate, is seen here

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Acute cholecystitis - Microscopic

The neutrophils are seen infiltrating the mucosa and submucosa of the gallbladder in this patient with acute cholecystitis and right upper quadrant abdominal pain with tenderness on palpation

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Acute bronchopneumonia , microscopic

At medium power magnification, numerous neutrophils fill the alveoli in this case of acute bronchopneumonia in a patient with a high fever. Pseudomonas aeruginosa was cultured from sputum. Note the dilated capillaries in the alveolar walls from vasodilation with the acute inflammatory process.

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ِAbscess formation lung , gross
Extensive acute inflammation may lead to abscess formation, as seen here with rounded abscesses (the purulent material has drained out after sectioning to leave a cavity) in upper lobe and lower lobe.

The white arrows mark areas of abscess formation in the upper lobe of this lung. The liquefactive necrosis of an abscess is apparent, because the purulent contents are draining out to leave a cavity. On a chest radiograph, the liquefied central contents of an abscess can appear as an "air-fluid level".

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Microabscess formation heart gross

Much smaller abscesses are seen here. These could be termed "microabscesses" due to their small size. Abscesses can come in a variety of sizes. Perhaps the most common abscess is the pimple on the face of a teenager.

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Abscess formation myocardium , microscobic

An abscess is a localized collection of PMN's. Here is a microabscess in the myocardium. The irregular dark purple center is a collection of bacteria that are the cause for this abscess.

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Abscessing bronchopneumonia , Gross

This abscessing bronchopneumonia has numerous areas of raised, lighter tan appearance which are the areas containing the extensive neutrophilic infiltrates

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