Cluster-like Headache Secondary to Cerebral Venous Thrombosis.

Cluster headache (CH) is considered a primary headache syndrome. However, symptomatic cases that resemble CH have also been reported. A patient with cerebral venous thrombosis presented with ipsilateral frontal pain accompanied by ophthalmoparesis, nasal congestion, and lacrimation. The patient's headache showed a dramatic response to oxygen. He experienced no further cluster-like headaches after treatment with an anticoagulant. This case suggests the possible role of venous stasis of the cavernous sinus in cluster-like headache.