An isolated conus medullaris cystic lymphangioma: Uncommon location of a rare pathology revealed by an acute conus medullaris syndrome

•Lymphangiomas are rare benign tumors.•Three types of lymphangiomas can be reported lymphangioma can be found all over the body, it may exist in the abdomen, oral cavity, mediastinum, axillary and inguinal region, but it largely affect the cervical region.•Clinical symptomatology depends on the tumor size and topography of the cystic lesion.•Magnetic resonance imaging seems to be useful, but would prove to be less efficient than CT in case of complications.•The treatment is essentially surgical allowing complete excision of the tumor to have complete cure.