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Prevalence of Incidental Bochdalek's Hernia in a Large Adult Population

¹ All authors: Department of Radiology, Harvard Medical School, Boston, MA 02114, and Department of Radiology, Founders House, Massachusetts General Hospital, Boston, MA 02114.

OBJECTIVE. The purpose of this study was to determine the prevalence and characteristics of adult Bochdalek's hernia in a large patient population.

MATERIALS AND METHODS. We retrospectively reviewed all abdominal CT scans obtained at our hospital in 1998. Patients in our study were identified through a keyword search of our database for "Bochdalek," "hernia," and "diaphragm." The individual patient studies identified were reviewed in a soft-copy format. We noted the location and side of the body on which the diaphragmatic hernia arose and the contents of the sac. We also performed a chart review for each patient included in the study, noting the patient's sex, age, and symptoms.

RESULTS. Incidental Bochdalek's hernia was diagnosed in 22 patients (17 women, five men), which represents an incidence of 0.17% based on 13,138 abdominal CT reports we reviewed. The mean age of the patients was 66.6 years. None of the patients were symptomatic. Sixty-eight percent of the hernias were on the right side of the body, 18% were on the left side, and 14% were bilateral. Seventy-three percent contained only fat or omentum, whereas 27% had solid or enteric organ involvement including the spleen, small intestine, or large intestine.

CONCLUSION. Bochdalek's hernia is not rare, and the incidence of Bochdalek's hernias that contain enteric tract is higher than previously reported. This incidence likely represents a conservative estimate because some Bochdalek's hernias may have been overlooked or unreported.

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