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Christopher O'Donnell

All articles by Christopher O'Donnell

Hospital Medicine

Empyema (Infections of the pleural space)

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Empyema (Infections of the Pleural Space) I. What every physician needs to know. An empyema is a focal infectious collection in the pleural cavity. This infection can be parasitic, fungal, but more likely than not is bacterial. Usually this disease arises when the patient has a pneumonia that spreads. However, it can develop post thoracic…

Hospital Medicine

Dieulafoy lesions and arteriovenous malformations

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Dieulafoy lesions and arteriovenous malformations I. What every physician needs to know. Dieulafoy lesions (Figure 1) are large tortuous arterioles in the stomach that cause between 1 to 5.8% of all upper gastrointestinal bleeds. They were initially discovered in 1898 by the French surgeon Paul Georges Dieulafoy. These lesions bleed briskly and patients can present…

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