Splenic artery aneurysm is a rare pathology, asymptomatic for a long time. It’s in fact often revealed by its complications, such as the rupture and potentially fatal acute haemorrhage. It’s incidentally discovered during instrumental exams, performed for other reasons, like the case of our woman, affected by ulcerating rectocolitis and suffering from renal colic pain, demonstrated. While surgical treatment is recommended for aneurysms larger than 2 cm in diameter or for symptomatic patients, or in pregancy (condition known to lead to a rupture), or in case of growing dilatation, the size rarely exceeds 3 cm. The unsuspected echographic identification of giant splenic aneurysm (> 11 cm) is reported, eligible for elective surgery.