6 , though they may provide limited relief in some cases; moreover, some patients become steroid-dependent and develop serious steroid-related adverse effects within months. CH is marked by its circadian rhythmicity. Episodic cluster periods start at the same time each year, occur at the same time each day and the duration of each CH is almost the same for every attack. These clinical features, along with the hormonal alterations documented in CH patients, suggest that the hypothalamus plays a role in the genesis of CH. PET studies by May et al. 7 , revealed hypothalamic activation during CH attacks, supporting the hypothesis of hypothalamic involvement. The concept of the hypothalamus acting as a CH generator has also been entertained 8 . However, not all CH patients present the same symptoms, nor do all respond to the same medications, which suggests that atypical or even non-hypothalamic forms of CH may exist. Although the cervico-occipital onset of CH is not contemplated by the International Headache Diagnostic Criteria II-version (IHDC -II), it is not uncommon to find patients with this painful symptomatology in clinical practice. Anatomical and clinical data suggest that the greater occipital nerve (GON) may trigger pain that has the typical cluster characteristics and is associated with the autonomic symptoms noted in CH. Sensory neurons in the trigeminocervical complex receive ipsilateral and contralateral input from the GON 9 . We describe an atypical cluster headache with trigeminal symptoms that improve after the blocked of the greater occipital nerve in one patient with occipital neuroma.
caseA 37-year-old woman came to the Headache Unit in our Pain Center in December 2005. She had a positive past medical history for migraine without aura. In March 2005, two weeks after a neck soft tissue trauma, she started experiencing daily headache attacks without periodicity. Each attack lasted from 30 to 120 min and occurred in the afternoons or evenings, with an average frequency of four attacks per day. The pain, which was always unilateral (right-sided), invariably started in the right occipital region and subsequently spread to the right eye and frontal region (Figure). The pain was severe and squeezing in nature, and was associated with right-eye ptosis, unilateral right-sided lacrimation and rhinorrhea (Figure). The pain was not associated with nausea, vomiting or phono-photophobia. During the attacks the patient was restless, rocking her head and body while standing or sitting.Oxygen and sumatriptan (subcutaneous 6 mg) were inconstantly effective, while NSAIDs did not provide any pain relief. The patient reported that the most effective pain control mechanism prior to referral to our Headache Unit had been the application of digital pressure to the right occipital region of the neck during the attacks. Preventive monotherapies (verapamil, valproate and steroids) previously prescribed by other physicians had been ineffective.Both the general and neurological examinations were normal, apart from the ...