2022年11月2日 · In some cases the hyperexpanded superior segment of the left lower lobe insinuates itself between the left upper lobe and the superior mediastinum, sharply silhouetting the aortic arch and resulting in a sickle-shaped lucency medially. This is known as the luftsichel sign 1.

This characteristic finding on CXR is known as the Luftsichel Sign and may represent collapse due to obstruction from a bronchogenic carcinoma. The lucency between the mediastinum and the collapsed LUL is caused by hyperexpansion of the superior segment of the LLL.

2024年8月16日 · Direct signs include: displacement of the interlobar fissures and crowding of vascular markings and bronchi. Indirect signs include local increase in opacity (greater medially than laterally), displacement of the hilum, elevation of the diaphragm, mediastinal shift and compensatory overinflation.

4 天之前 · A portion of the left lower lobe expands superior and medial to the collapsed lower lobe (red arrow) ("Luftsichel sign"). On the lateral view, the major fissure (black arrows) is displaced forward due to volume loss in the left upper lobe.

2024年8月17日 · The luftsichel sign is seen in some cases of left upper lobe collapse and refers to the frontal chest radiographic appearance due to hyperinflation of the superior segment of the left lower lobe interposing itself between the mediastinum and the collapsed left upper lobe.

2022年10月14日 · The left upper lobe (LUL) is one of two lobes in the left lung. It is separated from the left lower lobe by the left oblique fissure and subdivided into four bronchopulmonary segments, two of which represent the lingula.

Radiological criteria: Lobar density and signs of loss of lung volume. When there is endobronchial obstruction, there is no more ventilation and air gets absorbed from alveoli. Alveoli collapse with significant loss of lung volume. Example: Lobar atelectasis from endobronchial lung cancer.

Chronic non obstructive collapse of right middle lung lobe and usually associated with bronchiectasis. Most common in children with a history of asthma or atopy. RML syndrome in a 6 y/o child. PA view shows triangular shape opacity overlying to the right cardiac silhouette and mildly downward shifting of the hilum.

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2024年2月10日 · On CT scans, the atelectatic left upper lobe (LUL) forms a homogeneous opacity based on the anterior chest wall and the mediastinum (Figs. 8.3 and 8.4). Typically, the posterior margin has a V-shaped contour from the lung apex to the hilum, where the apex of the V merges with the hilar vessels and bronchi.