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Pathology · Inflammation: fibrinous exudate
Sample itemA 52-year-old man with end-stage renal disease has chest pain and a pericardial friction rub. At autopsy the pericardial surfaces are covered with a shaggy, 'bread and butter' fibrinous exudate. If the fibrin is not removed by fibrinolysis, what is the most likely outcome?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
C. Organisation into fibrous adhesions between the pericardial layers
Fibrinous inflammation occurs when vascular leakage is large enough for fibrinogen to pass into the tissue, as in uraemic pericarditis. Fibrin is normally cleared by fibrinolysis. When it persists, macrophages and fibroblasts grow into it and it is organised into scar tissue, which may cause adhesions or constrictive pericarditis.
Option by option
A. Formation of caseating granulomas
Caseating granulomas occur in tuberculosis, not in uraemic pericarditis.
B. Liquefactive necrosis with abscess formation
Abscess formation with liquefaction follows pyogenic bacterial infection, which is not the issue here.
C. Organisation into fibrous adhesions between the pericardial layers (correct)
Correct. Unresolved fibrin is organised into fibrous tissue, producing adhesions.
D. Complete resolution irrespective of fibrinolysis
Resolution depends on removal of fibrin by fibrinolysis, so it is not automatic if fibrin persists.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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