The lungs are hyperinflated with relatively flat diaphragms - a sign of pulmonary emphysema. There is a dense triangular opacity overlying the cardiac shadow with increased lucency of the left upper zone relative to the right upper zone. This is the "sail sign" of left lower lobe collapse with subsequent left upper lobe hyper-expansion.

May 3, 2024 · triangular opacity in the posteromedial aspect of the left lung (retrocardiac sail sign) left lower zone opacification (usually medially) with the apex pointing towards the left hilum edge of the collapsed lung may create a 'double cardiac contour'

Oct 11, 2020 · There are numerous sail signs in radiology, where a normal structure is displaced or a pathology creates the appearance of a sail: elbow sail sign: the raised anterior fat pad on an elbow radiograph; thymic sail sign: normal thymus on a pediatric chest radiograph; spinnaker-sail sign (angel wing sign): thymus outlined in pneumomediastinum

Feb 11, 2025 · The thymic sail sign represents a triangular-shaped inferior margin of the normal thymus seen on a neonatal frontal chest radiograph. It is more commonly seen on the right side, but can also be bilateral.

Feb 11, 2025 · The spinnaker sign (also known as the angel wing sign) is a sign of pneumomediastinum seen on neonatal chest radiographs. It refers to the thymus being outlined by air with each lobe displaced laterally and appearing like spinnaker sails.

Feb 11, 2025 · The sail sign on an elbow radiograph, also known as the anterior fat pad sign, describes the elevation of the anterior fat pad to create a silhouette similar to a billowing spinnaker sail from a boat. It indicates the presence of an elbow joint effusion.

Feb 11, 2025 · The retrocardiac sail sign represents the characteristic and highly specific appearance of left lower lobe collapse on a frontal chest x-ray. Radiographic appearance The collapsed, medially displaced left lower lobe is represented by a triangular area of increased density with sharp margins, superimposed on the heart shadow which resembles the ...

Feb 11, 2025 · The sail sign of the larynx refers to the axial appearance of unilateral dilatation of the laryngeal ventricle due to vocal cord/fold paralysis. It should not be confused with the several other sail signs in radiology.

Sep 20, 2024 · If there is an obstructing lesion in the bronchus intermedius, there will be signs of both RML and RLL collapse. CT triangular opacification in axial images, thinner at the hilum, against the posterior mediastinum/spine and medial hemidiaphragm 2

Oftentimes, the inferior margin of the thymus gland in the pediatric population can be seen as a triangular opacity superimposed on one lung field. This appearance, which is considered normal on a child's chest radiograph, has resemblance to the sail of …