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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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Lines of Zahn occur in which of the following?
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The correct answer is  Thrombi often have grossly and microscopically apparent laminations called lines of Zahn; these represent pale platelet and fibrin deposits alternating with darker red cell–rich layers. Such laminations signify that a thrombus has formed in flowing blood; their presence can therefore distinguish antemortem thrombosis from the bland non laminated clots occurring in postmortem clots.
In veins, thrombi form coral-like system with framework of platelets, fibrin and trapped white blood cells; This is a coralline thrombus.