CT imaging findings of corona mortis and a new method for venous typing.

To analyze CT angiographic images to provide comprehensive data on the corona mortis (CMOR) and propose a new classification method for venous corona mortis (VCMOR). This retrospective study included 719 patients (378 males, mean age 55 years) who underwent CT-enhanced examination of the whole abdomen or pelvis. Patient demographics, variation incidence, vessel diameter and location, anatomical configuration, and acetabular distance were evaluated. 73.44% of patients had at least one arterial or venous CMOR, with bilateral occurrences being more common (P < 0.001). The incidence of arterial corona mortis (ACMOR) was 23.92%, and it could be categorized into four types. The mean distance from ACMOR to the pubic symphysis was 56.6 mm, with a greater distance in females (62.2 mm) compared to males (50.4 mm) (P < 0.001). The incidence of VCMOR was 68.43%, with a higher bilateral occurrence (P < 0.001). Fourteen anatomical configurations of the VCMOR were identified and classified into two types and five subtypes. The mean interacetabular distance was 200.5 mm. The origin and branching variation of CMOR vary considerably, especially the venous type, which is characterized by diversity and complexity and needs to be recognized before pelvic operation.