Objective: The aim is to retrospectively assess the proportion, distrubition and properties of incidentally detected diaphragmatic hernies (Morgagni, Bochdaleck and Hiatal hernies) in multislice Computer Tomography (CT) studies of adults and compare with literature.

Material and Method: We retrospectively assessed CT findings of 1000 patients (670 abdomen and 330 thorax CT) admitted to with various clinical diagnosis. Primarily we investigate whether diaphragmatic hernia exists or not. The patients those have diaphragmatic hernia have been divided to three groups as Morgagni, Bochdaleck ve Hiatal hernia. After determine frequency we divided hernias to subgroups according to their content.

Results: Of these patients, totally 211 hernias were detected in 192 patients (%19.2). Among these hernias, 51% Morgagni, 37% Hiatal , and 12% were Bochdaleck hernia. Patients those have hernia (192 individuals) were diagnosed with single (88%), double (11%) and triple(1%) type of hernias. Patients with double type of hernia were including Morgagni and Hiatus (50%), Morgagni and Bochdalek (23%)and Bochdalek and Hiatus hernia (27%).

Conclusion: Increased using of thin sectional and low collimation cross sectional imaging techniques like multislice CT for thoracic and abdominal pathologies has eased incidental diagnosis of diaphragmatic hernia which raised their frequency. Diaphragmatic hernias were detected with highest ratio by using multisclice CT(% 19.2). The most common hernia type was Morgagni consequented by Hiatal and Bochdalek hernia, respectively.