Abducens nerve palsy and Horner syndrome due to metastatic tumor in the cavernous sinus

A 41-year-old man was diagnosed as having primary parotid carcinoma on the right side. After radical parotidectomy, radiation therapy and systemic chemotherapy, the primary parotid carcinoma was completely remitted. Two years later, right abducens nerve palsy and Horner syndrome appeared. Neuroimaging demonstrated a gadolinium-enhanced lesion in the posterior portion of the right cavernous sinus, and metastasis of parotid carcinoma was suspected. After radiosurgery and systemic chemotherapy, the intracavernous lesion disappeared. This is the first case of combination of abducens nerve palsy and ipsilateral Horner syndrome due to metastasis from parotid carcinoma to the cavernous sinus.