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Cerebral metabolism in Alzheimer's disease

between 1983 and 1987 at the Riyadh Military Hospital, which caters to military personnel as well as selected civilians. Although there might be geographic variation in the prevalence rates, this seems unlikely, as there is no evidence of clustering in our patients or others reported.5 Most likely this reflects a wider referral to Riyadh, where the medical facilities are more available and the neurology units are more established. We agree with Dr. Al-Rajeh and his group that the prevalence of MS in Saudi Arabia is not high, but it cannot be as low as they suggest: 1.04 per 100,000 population. Al-Din6 reported a prevalence rate of 8.33 per 100,000 population from Kuwait, a neighboring country in the Arabian Peninsula. Clinical unawareness due to the previous limitation of trained personnel and diagnostic facilities cannot be the only explanation of why the duration of illness in all patients is less than 10 years, especially since we have seen different varieties of chronic progressive neurologic patients with longer duration from many areas of the Kingdom.