Is the Interparietal Subtype of Groin Hernia Really Uncommon? A Single-Center Retrospective Cohort Study

Interparietal inguinal hernia is an anatomically atypical subtype of groin hernia in which the hernia sac extends between layers of the abdominal wall rather than along the inguinal canal. Its true prevalence and optimal surgical management remain poorly defined in the era of routine cross-sectional imaging and laparoscopic repair.

We conducted a single-center retrospective study of patients undergoing surgical repair for groin hernia between April 2023 and March 2025. Preoperative diagnosis was based on computed tomography (CT) imaging, and interparietal hernia was confirmed intraoperatively. Patient characteristics, imaging findings, operative details, and short-term outcomes were analyzed. Incidence was assessed at both the patient and lesion levels.

A total of 208 patients with 256 hernia lesions were included. Interparietal hernia was identified in 12 patients (5.8%) and 12 lesions (4.7%). Most patients were elderly women with low body mass index and presented with subtle or atypical groin symptoms. All cases suspected on preoperative CT were confirmed intraoperatively. A characteristic imaging feature was a hernia sac originating from the internal inguinal ring and extending cranially between abdominal wall layers. All interparietal hernias were successfully managed laparoscopically using the totally extraperitoneal approach, with no conversions, major complications, or need for bowel resection.

Interparietal inguinal hernia may be more frequently identified in contemporary practice than previously reported, likely reflecting improved detection with CT imaging. Recognition of characteristic imaging findings is essential for accurate diagnosis and surgical planning. Laparoscopic repair, particularly the totally extraperitoneal approach, is a safe and effective treatment for this uncommon hernia subtype.