pattern

1. A design; often refers to chest radiographic findings. 2. In dentistry, a form used in making a mold, as for an inlay or partial denture framework.

- airspace-filling p. SYN: 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. SYN: 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 that 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 black persons, and especially in leads V₁, V₂, and V₃.

- miliary p. a chest radiographic p. 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. SYN: occlusal form.

- reticulonodular p. (re-tik′u-lo-nod′u-lar) a somewhat netlike 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. SYN: wax form.

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pat·tern 'pat-ərn n

1) a model for making a mold used to form a casting

2) a reliable sample of traits, acts, tendencies, or other observable characteristics of a person, group, or institution <\patterns of behavior>

3) an established mode of behavior or cluster of mental attitudes, beliefs, and values that are held in common by members of a group

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pat·tern (patґərn) 1. a design to be followed or a device to be used in the construction or fabrication of something. 2. the particular design or arrangement of figures. 3. a characteristic set of traits or actions, as behavior patterns.