['The clinicopathological features of nine patients with non-cirrhotic portal hypertension were studied and an attempt was made to apply the descriptive criteria of experts to the morphological alterations of the livers in order to classify them adequately.', 'Clinical and biochemical data and the alterations in livers resected at transplantation (n=7) or at autopsy (n=2) were gathered in five males and four females (ages 15-78 years) without aetiological factors for chronic hepatic disease who had oesophageal varices and splenomegaly in the absence of typical cirrhosis. Noting the luminal obstruction of the three hepatic vascular trees, hyperplastic nodule size and distribution, and the density of fibrosis, an attempt was made to assign each case to one of the following diagnostic categories: idiopathic portal hypertension, diffuse nodular regenerative hyperplasia, partial nodular transformation and incomplete septal cirrhosis. When a case could not be categorized into one of these groups, it was listed as non-cirrhotic irregular architectural transformation. Only three cases could be assigned to one pure diagnostic category (two diffuse nodular regenerative hyperplasias and one incomplete septal cirrhosis). Three other cases could not be classified due to the heterogeneity of their lesions. In the remaining three cases, the hepatic morphology was a mixture of hilar partial nodular transformation combined with another abnormal architectural pattern in the peripheral parenchyma: diffuse nodular regenerative hyperplasia in two cases and idiopathic portal hypertension in the other. In seven cases, old thromboses in the hilar portal tree were observed. Stenoses were observed in some of the arterial branches in five cases and in some hepatic venous branches in four. However, no obstructions could be discovered in small or large portal veins in the two classical diffuse nodular regenerative hyperplasia cases.'] Are clinicopathological features of nine cases of non-cirrhotic portal hypertension : current definitions and criteria inadequate?