What is tram-track calcification?
The tram-track sign is produced by cortical calcifications that result from leptomeningeal vascular malformations found in patients with Sturge-Weber syndrome. The malformations consist of simple vascular structures situated along the space between the pia mater and the arachnoid membrane.
What is focal cystic bronchiectasis?
It is characterized by saccular dilatation of bronchi that extends to the pleural surfaces. When aggregated these may give a “bunch of grapes” like appearance.
What is meant by tram track?
Tramway track is used on tramways or light rail operations. Grooved rails (or girder rails) are often used to provide a protective flangeway in the trackwork in city streets. Like standard rail tracks, tram tracks consist of two parallel steel rails.
What is tram tracking?
Pulmonology. When found in the lungs, tram tracks are radiologic signs that are usually accompanied by pulmonary edema in cases of congestive heart failure and bronchiectasis. Tram tracks are caused by bronchial wall thickening, and can be detected on a lateral chest X-ray.
What is a tram track appearance?
A descriptive term for parallel, curved lines, radiopacities or radiolucencies of varying length. Bone A descriptor for the split cortical thickening with parallel neo-osteogenesis or endosteal splitting, seen in infarctions of long bones in sickle cell anaemia.
Is traction bronchiectasis serious?
Conclusions: The presence and severity of traction bronchiectasis/bronchiolectasis are associated with shorter survival. The traction bronchiectasis/bronchiolectasis is an important contributor to increased mortality among subjects with ILA.
How do tram tracks work?
Trains and trams can turn corners without wheel-slip because the outer horizontal part of the wheels has a slightly tapered rim. The guide flange (ridge) is on the inside to prevent the vehicle from slipping sideways off the rails. As the track starts to curve, the train tries to run straight.
Is tram a train?
Although trams are also rail-based modes of transport, trams are designed to travel shorter distances on public city and urban streets, sharing the road with other vehicles. Trains consist of a series of vehicles or coaches which are coupled together and drawn by a locomotive.
How long do tram rails last?
The new rails, which are made from harder wearing steel, have a life expectancy of 25 to 30 years.
What causes a tram track in the lungs?
When found in the lungs, tram tracks are radiologic signs that are usually accompanied by pulmonary edema in cases of congestive heart failure and bronchiectasis. Tram tracks are caused by bronchial wall thickening, and can be detected on a lateral chest X-ray.
When do you use 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. It should not be confused with other tram-track signs elsewhere in the body. 1. Cantin L, Bankier AA, Eisenberg RL.
What does the term tram track mean in neurology?
Neurology The term has also been used to describe findings associated with optic nerve sheath meningioma. Tram track-shaped calcifications in the cerebral cortex indicate Sturge-Weber syndrome.
What are the ring shadows on a tram?
1. Parallel linear densities, tram-track opacities. 2. Ring shadows reflecting thickened and abnormally dilated bronchial walls. These bronchial abnormalities may vary from subtle or barely perceptible 5-mm ring shadows to obvious cysts. 3.
