Criteria of the Silhouette Sign

Longuet, Roy; Phelan, James M.; Tanous, Helene; Bushong, Stewart C.

doi:10.1148/122.3.581

Cited by 12 publications

(3 citation statements)

References 3 publications

(4 reference statements)

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“…These structures are visible because they are intimately surrounded by the mediastinal pleura and contrast with the surrounding lung. All of the other mediastinal structures blend together and are not individually identifiable radiographically, i.e., the silhouette sign principle (2) (Fig. 1A).…”

mentioning

confidence: 99%

Radiography Review: The Mediastinum

Myer

1978

Veterinary Radiology

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mentioning

confidence: 99%

Radiography Review: The Mediastinum

Myer

1978

Veterinary Radiology

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“…The boundary of soft-tissue structures such as mediastinum, hilum, and one side of the diaphragm can be clearly seen on chest X-ray because of the adjacent pneumatic lung tissue. When a consolidated lung (or soft-tissue mass) is connected to one of these structures, its boundary disappears or is not clearly visible, which is called silhouette sign [43]. Silhouette signs are used to diagnose the presence of pulmonary abnormalities (such as consolidation, atelectasis, mass) and to locate them in a specific lobe or region of the lung.…”

Section: Discussionmentioning

confidence: 99%

Chest

Jiang

Zhang

et al. 2020

Classic Imaging Signs

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Contents 4.1 Multinodule Accumulation Sign 4.2 Lobulation Sign 4.3 Spinous Protuberant Sign 4.4 Vacuole Sign 4.5 Coarse Spicules Sign 4.6 Pleural Indentation Sign 4.7 Beaded Septum Sign 4.8 Honeycomb Sign 4.9 Withered Tree Sign 4.10 CT Angiogram Sign 4.11 Air Bronchiologram Sign 4.12 Air Bronchogram 4.13 Positive Bronchus Sign 4.14 Mucous Bronchogram 4.15 Gloved Finger Sign 4.16 Feeding Vessel Sign 4.17 Vascular Convergence Sign 4.18 Silhouette Sign 4.19 Luftsichel Sign

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“…The paraffin model employed an abrupt change in subject thickness to increase the likelihood ofdetecting the margins of the small block radiographically. 2 The block was easily seen when surrounded by air. When it was surrounded by mineral oil, a substance of nearly equal opacity, even this abrupt vith mineral oil and radiographsofthese configurations.…”

Section: Discussionmentioning

confidence: 99%

Effect of Dependency Versus Nondependency on Lung Lesion Visualization

Pechman

1987

Veterinary Radiology

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Paraffin blocks and mineral oil were used as a model to determine the effect of dependency versus nondependency on radiographic visualization of lung lesions in lateral thoracic radiographs. It was concluded that the increased opacity of the material surrounding the lesion, not contact between the heart and the lesion, was responsible for the inability to detect lung disease in the dependent lung. The results were tested in dogs with pneumonia in the right middle lung lobe. When the dog was in right lateral recumbency, the dependent right lung was increased in opacity and decreased in volume and the pulmonary lesion was difficult to detect. When the dog was in left lateral recumbency, the nondependent right lung was increased in volume and decreased in opacity and the pulmonary disease was clearly visible. A single recumbent lateral radiograph must not be used to assess a dog with suspected lung disease because lesions in the dependent lung lobes may not be detected.

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Criteria of the Silhouette Sign

Cited by 12 publications

References 3 publications

Radiography Review: The Mediastinum

Radiography Review: The Mediastinum

Chest

Effect of Dependency Versus Nondependency on Lung Lesion Visualization

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