Regression of hepatic cirrhosis is a controversial issue. Recently, a list of histopathological features, observed in human material, was suggested as a hallmark of cirrhosis in the process of regression. An investigation for the presence of these morphologic features was performed at monthly intervals in rats with proved carbon tetrachloride (CCl4)-induced cirrhosis over a period of 9 months following discontinuation of treatment, using sequential liver biopsies. Within the first 4 months, features of the "hepatic repair complex" were identified, together with the enlargement of the hepatic nodules and thinning of the fibrous septa. Subsequent to the 4 months, the histological picture, composed of large and inconspicuous nodules and delimited by thin and frequently incomplete fibrous septa "incomplete septal cirrhosis", appeared to be stabilized. These fibrous septa, when injected with India ink from the portal trunk, presented blood vessels that were seen to drain directly into the sinusoids. These findings suggested that when the cause of cirrhosis is removed, the liver may adapt itself to a new and permanent structure, probably compatible with normal or near-normal function, which may render hepatic cirrhosis clinically, although not morphologically, reversible.
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