Although chest radiographs are still useful as an initial test their utility is limited in the diagnosis of lung diseases that depend on higher resolution images such as interstitial lung diseases and. This describes airways viewed in a transverse plane.
Ajnr am j neuroradiol 1984.
Tram track sign ct chest. More in detail bronchiectases are shown as parallel line opacities on chest radiography. Tram track sign refers to the parallel thickening and enhancement around the optic nerve and is most frequently seen in the setting of optic nerve meningioma. Ct chest pre and post contrast arterial phase is the ideal investigation to determine presence of aortic intramural haematoma true lumen and extent of dissection.
Orbital pseudotumor perioptic neuritis orbital. 53 the bronchial walls are always thickened denoting airway inflammation and accompanying radiographic findings include the signet ring sign on cross sectional view. 3 rothfus we curtin hd slamovits tl kennerdell js.
A differential approach based on high resolution ct morphology. It should not be confused with other tram track signs elsewhere in the body. The advent of high resolution ct scanning of the chest has led to its increasing use.
In chest radiographs of patients affected by cylindrical bronchiectasis the tram track sign is reproduced by the presence of thickened bronchial branches which may reproduce a tram line appearance fig. This description applies to dilated airways seen in a horizontal orientation. Implies non uniform bronchial dilatation.
Ct evaluation of perineural orbital lesions. Ct scanning of the chest is one of the most important imaging modalities available to a pulmonologist. There is a true lumen and a false lumen separated by an intimal flap tunica intima which has been detached from tunica media.
Evaluation of the tram track sign. Tram track sign may be used in chest radiography or ct to denote the thickened non tapering parallel walls of cylindrical bronchiectasis. Ecr 2014 c 1769 classic signs in thoracic radiology by.
The dilated airway lies adjacent to a pulmonary artery branch giving the appearance of a ring varicose. Cylindrical tram track sign. The tram track sign has been described in both chest radiographs and chest ct scans and refers to the parallel nontapering airways seen extending to the lung periphery in cylindrical bronchiectasis.
It may however also be seen in 1. Feb 6 2019 poster.