Ramirez et al. (1995) reported the occurrence of idiopathic extrahepatic portal hypertension (EHPH) due to cavernous transformation of the portal vein in a father and daughter who both had complications of portal hypertension in early childhood. In addition, the father had juvenile polyposis coli (174900).
Ramirez, R. O., Sokol, R. J., Hays, T., Silverman, H. Case report: familial occurrence of cavernous transformation of the portal vein. J. Pediat. Gastroent. Nutr. 21: 313-318, 1995. [PubMed: 8523216] [Full Text: https://doi.org/10.1097/00005176-199510000-00010]