In patients with ophthalmoplegia involving probably the third cranial nerve, disclosing this MRI sign could help (i) to confirm the involvement of the oculomotor nerve and eliminate differential diagnoses such as myasthenia (ii) to orientate the etiological diagnosis (inflammatory or ischemic origin). This new sequence 3D PD T1 sequence focused on the III could thus be systematically included in the usual MRI protocol.