Acquired abdominal intercostal hernia: case report and systematic review of the literature.

PURPOSE: The protrusion of abdominal viscera through an intercostal space under an intact diaphragm is a very rare condition. The aim of this study is to elucidate the etiology, clinical features, and therapeutic options on what several authors call "abdominal intercostal hernia" (AIH). METHODS: A typical case of AIH of the 9th left intercostal space in a 48-year-old man is presented. A literature search was conducted on the Medline and Scopus databases. Only acquired AIHs (AAIHs) were considered, while lung, transdiaphragmatic, and congenital intercostal hernias were excluded. RESULTS: Eighteen studies met selection criteria and a total of 20 patients were useful for analysis. Etiology was related mainly to traumatism (65 %) or to previous surgery (20 %). The intercostal defects were mostly located under the 9th rib without significant differences as to side. The main symptom was chest swelling (85 %), often associated with discomfort or pain (76 %). Acute complications such as incarceration and strangulation occurred in three patients. CT was the most employed diagnostic tool (80 %). Early diagnosis was made in 25 % of cases. Seventeen patients underwent hernia repair with either open (73 %) or laparoscopic approach (28 %), and various techniques with and without prosthesis were described. Recurrence occurred in 28.6 % of patients, during a mean follow-up of 8.6 months. CONCLUSIONS: AAIH should be always suspected when chest swelling occurs after a minor or major trauma, and CT must be promptly performed to rule out diaphragmatic or abdominal viscera injury. This condition requires surgery to prevent serious complications, the first-choice technique should be mesh tension-free repair.