Spontaneous hematoma of the mesocolon is a rare condition, mainly due to the rupture of a colic artery aneurysm. The authors report on two cases of spontaneous hematoma of the mesocolon and examine the relevant literature. The clinical presentation in our patients was, as indicated in the literature, non-specific, with the occurrence of acute abdomen (case 1) or mild abdominal pain (case 2). Only diagnostic imaging (contrast-enhanced CT scan) is capable of yielding an accurate diagnosis, specifying the size and location of the hematoma. A palpable mass or hemoperitoneum due to rupture should be regarded as late signs of presentation. Early diagnosis is of the utmost importance in order to avoid the by no means negligible mortality reported in such instances or ischaemic bowel wall complications.