Summary
1) Cirrhosis is defined as the scarring of the liver acini in zone 3, zone 1 or in both; the resulting nodules are scarred and modified remnants of acini of various orders. The division of the nodules into “micronodules” and “macronodules” is difficult to justify as their two dimensional appearance changes at different planes of section.
2) Early scar formation precedes changes in the microcirculatory dynamics. Sprouting of vascular branches, especially of arterioles, takes the leading role in the development of mature scars, i.e. offibro-vascular membranes. The fibrous repair is at the same time the road builder for collateral flow.
3) The pathophysiology of the collateral circulation is the basic determinant in the formation of the cirrhotic patterns. The three microcirculatory phases in the cirrhotic process are due to a changeover of the intrahepatic circulatory path from the normal trichotomy of the preterminal vascular branches to convoluted collateral channels. The three phases of the cirrhotic process are:
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a.
The Triadal Nodule. It receives blood from the TPV and THAand from the perinodular plexus. The nodular parenchyma may already be segregated from the ThV, a situation that leads to portal hypertension.
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b.
The Para-triadal Nodule. It is a conglomerate of nodules that often are not completely separated from each other; they are derived from neighbouring acini of various orders which receive blood from large triads contained in the perinodular scar. The blood arrives into the sinusoids primarily via the perinodular plexus. Some sinusoids may receive additional blood through sclerosing remnants of terminal afferent branches and through irregular vascular twigs which, along with septa, enter the nodules at various sites.
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c.
The A-triadal Nodule. It is completely separated from neighbouring nodules by thick scars, its parenchyma totally segregated from afferent and efferent vascular branches. The nodules receive blood only from a dense perinodular plexus of wide capillaries.
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Supported by the Atkinson Foundation, the Oxford Liver Research Foundation and the Canadian Liver Foundation
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Rappaport, A.M., MacPhee, P.J., Fisher, M.M. et al. The scarring of the liver acini (Cirrhosis). Vichows Archiv A Pathol Anat 402, 107–137 (1983). https://doi.org/10.1007/BF00695054
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DOI: https://doi.org/10.1007/BF00695054