Overall however, EEG during episodes and other investigative methods such as brain MRI, TACs, angiographic MRIs and CFS have normal results. Non-paroxysmal symptoms
In the long term, many paroxysmal symptoms occur along with AHC, and while these symptoms vary in strength depending on the person, they are consistent features of AHC. It is thought that some of these symptoms are brought on or worsened by hemiplegic attacks, though it is not known for certain. Patients suffer persistent motor, movement (ataxia), and cognitive deficits. These deficits become more apparent over time and include developmental delays, social problems, and retardation. It is rare for someone with AHC not to have cognitive deficits, but a study in Japan did find two patients who met all of the diagnostic criteria for AHC but who were not mentally impaired. It is not known whether AHC is a progressive disease, but severe attacks are suspected to cause damage which result in permanent loss of function. 100% of children studied in the USA have had some form of mental impairment, which is usually described as mild to moderate, but varies greatly among individuals. Epilepsy
At least 50% of AHC sufferers also suffer from epilepsy, and AHC is often misdiagnosed as epilepsy because of this. These epileptic events are distinguished from other episodes by an alteration of consciousness, as well as frequent tonic or tonic-clonic activity. Epileptic episodes are generally rare, though they do increase with age. Due to the rarity of epileptic episodes, there are few EEG confirmations of them.
Erythrocyanosis crurum is a skin condition, a variant  of acrocyanosis caused by chronic exposure to cold. See also
Chilblains
List of cutaneous conditions

References
Otto Braun-Falco; G. Plewig; H. H. Wolff; Walter H. C. Burgdorf (2000). Dermatology. Springer Verlag. p. 889. ISBN 3-540-59452-3. James, William D.; Berger, Timothy G.;  et al. (2006). Andrews Diseases of the Skin: Clinical Dermatology. Saunders Elsevier. ISBN 0-7216-2921-0. == External links ==