A 75-suffers from dyspnea at rest, marked weakness, and arrhythmia. Abdominal Iman in a severe condition aortic pulsation is observed, further on there is a systolic murmur detected. Palpation reveals a volumetric formation in the mesogastrium. Blood pressure is 70/40 mm Hg. There is no pulsation over the femoral arterics. Oliguria is detected. Which diagnosis is the correct one?