Isolated Oculomotor Nerve Palsy After Temporoparietal Lobar Hemorrhage With a Mass Effect: A Case Report.

We report a case of a patient who presented with ipsilateral oculomotor nerve palsy after a spontaneous left temporoparietal lobar hemorrhage with mass effect. Primary symptomatology included ipsilateral ptosis, dilated fixed pupil, and a lack of superior and medial movement with limited inferior left eye movements. Brain imaging revealed compression of the left upper midbrain due to subtentorial herniation of the hemorrhage, and susceptibility-weighted images sequences showed cerebral microbleed in the left midbrain substantia nigra. Based on our observation from this case, physicians should consider temporoparietal lobar hemorrhage with mass effect as an attributable factor in the etiologic cause of ipsilateral oculomotor nerve palsy.