Five patients with cystadenoma of the pancreas have been treated in the surgical department of the New York Hospital during the past nine years, and it is with the purpose of bringing out certain diagnostic features and operative findings that the 5 cases are hereinafter reported and discussed. No attempt has been made to review the literature on pancreatic cysts, for this was done recently by Kennard1 in 1941. However, certain publications are of special interest in regard to the incidence and the classification of these tumors. White2 found 3 cases of pancreatic cyst, 1 of which was hydatid, in 6,708 autopsies at Guy's Hospital in London, England; Young,3 5 patients with cysts between 1920 and 1937 at the Massachusetts General Hospital, Boston; and Judd,4 88 who came to operation among a total of 723,397 patients admitted to the Mayo Clinic, Rochester, Minn. In a series