Marfan's syndrome presenting with abdominal aortic aneurysm: a case for vigilance.

We present the case of a 16-year old student with Marfan's syndrome and abdominal aortic aneurysm who presented with a diagnostic conundrum. He presented with a three months history of progressive painful left upper abdominal mass and back pain. It became severe in the last two weeks before presentation and was associated with constipation.