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Migraine with aura including motor weakness, and no first- or second-degree relative has migraine aura including motor weakness.
- Attacks fulfilling criteria for 1.2.3 Hemiplegic migraine
- No first- or second-degree relative fulfils criteria for 1.2.3 Hemiplegic migraine.
Epidemiological studies have shown that sporadic cases occur with approximately the same prevalence as familial cases.
The attacks in 188.8.131.52 Sporadic hemiplegic migraine have the same clinical characteristics as those in 184.108.40.206 Familial hemiplegic migraine. Some apparently sporadic cases have known FHM mutations and, in some, a first- or second-degree relative later develops hemiplegic migraine, thus completing fulfilment of the criteria for 220.127.116.11 Familial hemiplegic migraine and requiring a change of diagnosis.
Sporadic cases usually require neuroimaging and other tests to rule out other causes. A lumbar puncture may be necessary to rule out 7.8 Syndrome of transient headache and neurological deficits with cerebrospinal fluid lymphocytosis (HaNDL).