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| Empyema | |
|---|---|
| Specialty | Pulmonology, infectious disease |
An empyema (/ˌɛmpaɪˈiːmə/; from Ancient Greek ἐμπύημα (empúēma) 'abscess') is a collection or gathering of pus within a naturally existing anatomical cavity. The term is most commonly used to refer to pleural empyema,[1] which is empyema of the pleural cavity. It is similar or the same in meaning as an abscess, but the context of use may sometimes be different. For instance, appendicular abscess is also formed within a natural cavity as the definition of empyema.
Empyema most commonly occurs as a complication of pneumonia but can also result from other infections or conditions that lead to the collection of infected fluid in a body cavity.[2]
Empyema occurs in:
Chest X-rays or computed tomography (CT) scans can reveal the presence of fluid within the pleural space and help assess its characteristics. Once a fluid-filled cavity has been identified, it is often partially or fully drained with a needle, so that the fluid may be analyzed. This helps determine whether the fluid is infected and allows for the identification of the causative microorganisms. Blood tests may also be performed, which can identify both an elevated neutrophil count, which is indicative of an infection, or bacteremia.[2]
In addition to CT, suspected cases of empyema in and around the brain are often subjected to more rigorous neuroimaging techniques, including MRI. In these cases, fluid samples are obtained via stereotactic needles rather than lumbar puncture, because unlike most cases of meningitis, a lumbar puncture will most often not reveal anything about the causative microorganisms.[3]
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