pattern (pat´ern)

1. A design. 2. In dentistry, a form used in making a mold, as for an inlay or partial denture framework.
airspace-filling p. alveolar p
airway p. chest radiographic appearance of thickened bronchial walls, bronchiectasis, bronchiolitis, or acinar consolidation.
alveolar p. cloudy to dense opacities, obscuring vascular markings, on chest radiographs.airspace-filling p;
ballerina-foot p. a vigorous posteromedial contraction of the left ventricle coupled with convexity anteriorly sometimes resulting from poor contraction of the opposing anterior wall; it is the most frequent dyssynergy observed in the prolapsed mitral valve leaflet syndrome (even with a normal anterior wall) and produces a configuration of angiographic dye in the right anterior oblique projection resembling a ballerina's foot; sometimes called dancer's foot malformation.
butterfly p. bilateral, symmetric, pulmonary alveolar opacities sparing the periphery, on chest radiographs; usually caused by pulmonary edema.
ground-glass p. radiographic or CT appearance of hazy opacity which fails to obscure pulmonary vascular markings.
honeycomb p. dense, slightly irregular circular shadows, most common next to the pleura at the lung base, on chest radiographs or CT; caused by chronic interstitial fibrosis of diverse causes.
hourglass p. a vigorous ringlike contraction observed angiographically in the left ventricular angiogram in the right anterior oblique projection, resembling an hourglass; it is seen in the prolapsed mitral valve leaflet syndrome.
interstitial p. one of several chest radiographic patterns associated with interstitial infiltration or thickening, including honeycomb p., miliary p., reticulonodular p., or septal lines.
juvenile p. a precordial T-wave inversion, sometimes with J-ST elevations in an electrocardiogram, resembling that seen in normal children, which occurs as a normal variant in some adults, especially blacks, and especially in leads V1, V2, and V3.
miliary p. a chest radiographic pattern of fine, rounded opacities, typical of hematogenous dissemination of tuberculosis; size has some relationship to that of a millet seed.
mosaic p. on high-resolution CT scans of the lungs, a p. of brighter and darker regions corresponding to differences in perfusion or aeration; found in some cases of chronic thromboembolism or of bronchiolitis obliterans. Cf. oligemia.
occlusal p. occlusal form
reticulonodular p. (re-tik´yu-lo-nod´yu-lar) a somewhat net-like chest radiographic p., with nodular thickening at the intersections of the lines; a nonspecific interstitial p.
wax p. a p. of wax that, when invested and burned out or otherwise eliminated, will produce a mold in which a casting may be made.wax form;


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