Image Based Question-69915

An occluding mass is present in an artery.Cut section of artery is shown in the image.The arterial pathology of this condition differs from venous type in the following ways except:

A. Leads to infarcts.

B. Formed in slowly flowing blood.

C. Macroscopically seen as grey -white.

D. Formed following endothelial cell injury.

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Correct Answer » B Explanation

Ans:B. Formed in slowly flowing blood

Arterial Thrombus is shown in the image.

THROMBUS

• Thrombosis is the process of formation of solid mass in circulation from the constituents of flowing blood; the mass itself is called a thrombus.

MORPHOLOGICAL FEATURES:

• Arterial thrombi tend to be white and mural while the venous thrombi are red and occlusive.

• Mixed or laminated thrombi are also common and consist of alternate white and red layers called lines of Zahn.

• Red thrombi are soft, red and gelatinous whereas white thrombi are firm and pale.

• Microscopically, the composition of thrombus is determined by the rate of flow of blood i.e. whether it is formed in the rapid arterial and cardiac circulation, or in the slow moving flow in veins.

• The lines of Zahn are formed by alternate layers of light-staining aggregated platelets admixed with fibrin meshwork and dark-staining layer of red cells.

• Red (venous) thrombi have more abundant red cells, leucocytes and platelets entrapped in fibrin meshwork. Thus, red thrombi closely resemble blood clots in vitro.