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MY9700691 CT of Pleural Abnormalities MY9700691 CH4-CHEST CT of Pleural Abnormalities which the soft-tissue opacity parietal pleura and innermost intercostal muscle are separated by a layer of low attenuation fat W. Richard Webb 3) In the paravertebral regions, a distinct stripe of Dept of Radiology, University of California of San density, 1 or 2 mm in thickness, indicates the Francisco, San Francisco presence of pleural thickening. The pleural surface of the lung and adjacent chest CT Technique for Examining the Pleura or Pleuro- wall are made up of a number of tissue layers. On CT Pulmonary Disease in normal patients, a 1 to 2 mm thick stripe of soft Usually contiguous 1 cm collimation, or spiral CT tissue density (the "intercostal stripe") is often visible with 7 mm collimation is sufficient for imaging in the anterolateral and posterolateral intercostal pleural abnormalities. Contrast enhancement at an spaces, at the point of contact of lung with chest injection rate of 1-2 ml/sec is essential; following wall.1 This stripe primarily represents the innermost contrast opacification thickened pleura, fluid collec- intercostal muscle. Although the parietal pleura, a tions, and collapsed or consolidated lung can be thin layer of extrapleural fat, and the endothoracic distinguished [4]. This is not always possible without fascia lie internal to the innermost intercostal muscle contrast infusion. and rib segments, they are not normally visible on CT orHRCT. Diagnosis of Pleural Fluid Collections Is it an exudate or a transudate? In the paravertebral regions, the innermost intercostal muscle is anatomically absent. In this location, a very Distinguishing an exudate from a transudate can be thin line (the "paravertebral line") is sometimes vis- important in differential diagnosis and clinical ible on CT at the lung-chest wall interface; this line management. Exudative effusions can have a variety represents the combined thicknesses of the visceral of causes, but often reflect the presence of a pleural and parietal pleura and the endothoracic fascia.1 abnormality associated with increased permeability of pleural capillaries.56 Common causes of an CT Diagnosis of Pleural Thickening exudate include pneumonia, empyema, and neo- plasm. Transudative effusions are unassociated with Asbestos exposure is known to result in thickening of pleural disease, and are usually the result of systemic 1 3 the parietal pleura. ' Thus, patients with asbestos abnormalities which cause an imbalance in the exposure serve as an excellent model of parietal hydrostatic and osmotic forces leading to pleural pleural thickening for the purpose of understanding fluid formation. Common causes of a transudative the CT appearances of pleural disease. In patients effusion include congestive heart failure, cirrhosis, with asbestos exposure, parietal pleural thickening overhydration, and nephrotic syndrome. can result in 3 findings: Most effusions appear to be near water in attenuation on CT. CT numbers cannot be used to reliably predict 1) A stripe of soft tissue density, 1 mm or more in the protein content or specific gravity of the fluid, and thickness, can be seen internal to rib segments. whether it is a transudate or an exudate. Acute or Since parietal pleural thickening is often subacute hemothorax can sometimes appear associated with thickening of the normal inhomogeneous in attenuation with some regions, extrapleural fat layer, the thickened pleura particulary dependent regions, having a CT attenua- may be separated from the rib by several mm. tion value greater than that of water. 2) Thickening of the extrapleural fat layer can also allow the thickened parietal pleura to be The appearance of the parietal pleura on contrast Seen as distinct from the innermost intercostal enhanced CT can be of value in predicting the nature muscle. This results in the "sandwich sign", in of a pleural fluid collection [4]. The presence of 82 thickened parietal pleura on contrast enhanced CT, in Stage 1 (Exudative Stage) association with a pleural effusion, indicates that the An exudative parapneumonic effusion probably results fluid collection is an exudate, with only rare from increased permeability of the visceral pleura. exceptions. Such an effusion should be tapped for Effusions in this stage are commonly exudates, as the diagnosis. The absence of pleural thickening in a name implies, and are typically small, sterile, and patient with pleural effusion indicates that the effusion have normal glucose (> 40 - 60 mg/dL) and pH values is either a transudate or exudate.47 In a study we ha ve 4 (> 7.2). They will usually resolve with appropriate performed, pleural thickening is present in only 61 % antibiotic treatment. Stage 1 effusions may not show of consecutive patients with an exudate; this finding pleural thickening on CT. As indicated above, about had a specificity of 96% in diagnosing exudate and a 50% of exudative parapneumonic effusions will show positive predictive value of 97%. pleural thickening; these are usually crescentic, with- out evidence of loculation. Pleural thickening on CT is least sensitive (27-48%) in patients with an exudate associated w ith neoplasm. Stage 2 (Fibropurulent or Acute Empyema Stage) On the other hand, CT shows pleural thickening and enhancement in nearly all patients with empyema. In The term "empyema" is generally used when a pleural a study by Waite et al.,7 23 of 24 empyemas demon- effusion is infected, although its true definition strated pleural thickening and enhancement on CT. In necessitates the presence of "pus" in the pleural space. our study, all 10 empyemas showed pleural thicken- Although most empyemas occur in association with ing; pleural thickening was less frequently (56%) pneumonia, approximately 10% are unassociated with seen in association with uninfected parapneumonic obvious lung disease. The term "empyema" is effusions. synonymous with "fibropurulent parapneumonic effusion". Thus, in a patient with symptoms of infection and a pleural effusion, thepresenceof parietal pleural thick- The fibropurulent stage of a parapneumonic effusion ening on CT indicates thepresenceof an exudate, and is characterized by the presence of organisms in the thoracentesis is necessary. If pleural thickening is pleural fluid, increased effusion, increased WBC and absent, empyema or complicated parapneumonic PMN in the fluid, fibrin deposition along the pleural effusion (one needing drainage for treatment) is highly unlikely. In a patient with malignancy, CT does not surfaces, a tendency for loculation, decreased glucose help in assessing the presence or absence of a malig- and pH levels, and increased LDH (>1000 IU/L). nant effusion, and thoracentesis is usually required regardless of what CT shows. In a patient who has a pneumonia, the presence of a localized or loculated pleural effusion strongly Sonography is also useful in diagnosing the presence suggests the presence of an empyema. On plain of an exudate, with an accuracy nearly identical to radiographs, empyemas or loculated fluid collections that of CT. Yang et al8 found that all effusions having will often have a somewhat lenticular configuration, the sonographic appearances of septation, complex appearing much larger in one dimension (i.e. as seen nonseptation, or homogeneous echogenicity were on the PA radiography) than the other (i.e. on the exudative. Anechoic effusions, however could be lateral radiography). Furthermore, because the either transudative or exudative. The sensitivity of collection may have a obtuse angles at the point it sonography in this study was 66%, with a specificity contacts the chest wall, it may appear much more of 100% and a positive predictive value was 100%. sharply defined in oneprojection than the other. In the presence of a bronchopleural fistula (BPF), an Diagnosis of Pleural Fluid Abnormalities in empyema cavity can contain air. Gas within an Patients with Pneumonia empyema is presumptive evidence of a BPF, although Pleural fluid accumulates in approximately 40% of the presence of agas-forming organism is occasionally patients with pneumonia, and the term parapneumonic associated with this finding. effusion is used to describe this occurrence. Parapneumonic effusions are usually classified in 3 With conventional radiographic techniques, an stages (these are also known as the 3 stages of an empyema contain ing air may be difficult or impossible empyema). to differentiate from a peripheral lung abscess abutting the chest wall. This distinction can be an important 83 one to make because empyemas are often treated by thoracentesis, 2) positive gram stain, 3) pH < 7.0, tube thoracostomy in addition to systemic antibiotics, 4) glucose < 40 mg/dL. Although pleural thickening whereas most lung abscesses require antibiotics only. seen on CT is common in an acute empyema, this On CT, empyemas typically have a regular shape and does not constitute a "pleural peel", and surgery is are round, elliptical, or lenticular in cross section, rarely required. Follow tube drainage, the pleural 910 although crescentic collections can also be seen; thickening usually resolves within a period of days or they tend to be sharply demarcated from the adjacent weeks,12 although focal pleural abnormalities can lung. Parietal pleural thickening is almost always remain. Tube thoracostomy is generally avoided in seen on CT, while visceral pleural enhancement is patients with a tuberculous empyema. somewhat less common. With contrast infusion, a "split-pleura" sign is commonly visible, with the Stage 3 (Organization
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