Introduction: Intracranial lipomas are rare lesions of developmental origin. They are generally asymptomatic and localized in the midline. However, they may occasionally produce neurological symptoms such as seizures. Surgical treatment is rarely indicated. Case report: We report a child with a lipoma that is located on the ventral side of the mamillary bodies. The diagnosis was made using computerized tomography (CT) and magnetic-resonance imaging (MRI). There have been no previous reports of lipomas in this location.