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Ulcerative and granulomatous colitis. Variations in observer interpretations and in roentgenographic appearance as related to time.

This analysis of 21 cases of ulcerative and granulomatous colitis once again points out the overlapping patterns of the 2 pathologic processes. Data indicated that ulcerative colitis was diagnosed correctly more often than granulomatous colitis at this institution. The reliability of the various "classical findings" used as criteria at this institution may be questioned, since many such findings are apparently responsible for incorrect as well as correct diagnoses.Inter-observer variation may well represent individual bias in this study; it was wide enough however to pinpoint the equivocal nature of some of the findings. The intra-observer variation (when the first reading of 18 sets of roentgenograms was compared with a second reading made 3 months later) was also substantial enough (11 to 44 per cent) to raise doubts about the possibility of achieving correct diagnosis strictly from barium enema examination. The findings in this study stress once again the necessity for basing diagnosis of a case of col...