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LM of blocked pulmonary artery (embolism)

LM of blocked pulmonary artery (embolism)

M175/0079

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Credit

BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY

Caption

Light micrograph of human lung tissue showing a branch of the pulmonary artery occluded (blocked) by an embolus (red) originating from a thrombus (clot) in the deep veins of the leg. Fragments of thrombus may become detached from their site of formation & travel in the circulation as thrombo- emboli. On reaching vessels small enough to prevent further passage, the thrombo-emboli become lodged and cause obstruction to blood flow. Depending on the degree of obstruction & extent of alternative blood supply, the result is either a reduced blood supply to tissue (ischaemia) or total cessation leading to infarction (tissue death). FIG. BASIC HISTOPATHOLOGY.

Release details

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