RT Journal A1 Clifton JA T1 REgional ileitis. JF A.M.A. Archives of Internal Medicine JO A.M.A. Archives of Internal Medicine YR 1959 FD July 1 VO 104 IS 1 SP 169 OP 169 DO 10.1001/archinte.1959.00270070171028 UL http://dx.doi.org/10.1001/archinte.1959.00270070171028 AB This, the second edition of Dr. Burrill Crohn's monograph on regional enteritis, was written some ten years after the first. Dr. Harry Yarnis, an associate of Dr. Crohn's at the Mt. Sinai Hospital, is co-author. Since the first edition, no great advances have occurred in the diagnosis or in the treatment of regional enteritis, and no real clue to the etiology of the disease has been found. The publication of this second edition, however, is fully warranted as the number of observed patients has more than doubled and their follow-up has been extended a decade. A total of 676 patients with ileitis in one of its various types form the basis of the report. Some were included in Dr. Crohn's original paper on regional ileitis, in 1932, and thus have been followed for twenty-five years. All were private patients of Dr. Crohn and have been followed by him personally. Certainly