Hemicrania With Partial Horner's Syndrome—but Not Raeder's Syndrome

To the Editor.  —It is now well recognized that unilateral headache or face pain or both in association with oculosympathetic paresis can be seen in a number of pathologic processes involving the internal carotid artery in the neck.^1,2 In their interesting case report, Harrington and Mayman³ document a case of carotid body tumor associated with this combination of symptoms and signs—which clearly differs from what Raeder⁴ described in 1924. Raeder described five cases, including one that had been described earlier (in 1918), each with evidence of trigeminal nerve involvement and with incomplete Horner's syndrome (differing from the typical Horner's syndrome by the absence of facial anhydrosis and, in one case, also by the absence of ptosis). All but one patient had evidence of other cranial nerve involvement. Raeder believed that this association of oculosympathetic and trigeminal signs had a localizing value, pointing to a lesion in a