Papillary cystic neoplasm of the pancreas: a description of two clinical cases. - Principe,A.; Lugaresi,M.L.; Lords,R.C.; Golfieri,R.; D'Errico,A.; Bicchierri,I.; Gallo,M.C.; Polito,E.; Cavallari,A. (Hepatogastroenterology, 1997)