Mesenteric haematomas are a rare surgical presentation and are associated with trauma, pancreatitis or anticoagulation treatment. We report two cases diagnosed as spontaneous mesenteric haematomas. In both cases, MRI was diagnostic of a mesenteric haematoma and both cases were managed conservatively with interval imaging until complete resolution of the haematomas. We discuss the clinical features, diagnostic modalities and management options of mesenteric haematomas in the light of the literature. We emphasise the importance of radiological imaging to delineate the underlying pathology and appropriate management strategies. In the absence of obvious underlying pathology, spontaneous mesenteric haematomas can be managed conservatively.