Pseudomembranous enterocolitis has been a major clinical problem, particularly so since the recognition of increasing numbers of bacteria which are resistant to broad-spectrum antibiotics (2–6, 8, 11, 12, 15, 17. 20, 21, 25). Surgical interest in the problem (7–10, 16, 19, 21, 22, 24, 25) has led to much recent study, but the condition was reported in the nineteenth century (25). In spite of numerous articles on the subject, radiographic findings are mentioned in passing in only two (17, 18), and then in a negative sense. The purpose of this study is to describe the roentgen findings as illustrated by a survey of proved cases of pseudomembranous enterocolitis. Clinical Observations The age range of the disease is from birth through the geriatric group (7, 16). Initial manifestations may be nonspecific. Abdominal distention, usually without borborygmi, is a frequent finding. Nausea and vomiting may appear in the first four days. On the third or fourth day, diarrhea occurs in as many as half the cases. Ileu...