<prompt> Abdominal Aoic Aneurysm most commonly ruptures inRetroperitoneumPelvic cavityPeritoneal cavitySub hepatic space  <response>: Abdominal aoic aneurysm - anterior20 Posterior 80 Most common site- retroperitonium with formation if retroperitonial hematoma. Reference- SRB, 5th edition, page:200 