Tram track (medicine)
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.
The term "tram-tracks" is also used to describe the basement membrane duplication found on light microscopy that is characteristic of membranoproliferative glomerulonephritis (MPGN) type I. (It is less commonly associated with types II and III.)
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