Morphometric analysis of axons in the minute multiple sclerosis lesions and shadow plaques in patients with multiple sclerosis.

The objective of the present study was to quantitatively detect axons in the minute multiple sclerosis (MS) lesions and in shadow plaques, taking into consideration the relapsing-remitting(R-R) and secondary progressive(SP) stages of MS. The brain tissue of 12 patients deceased due to MS was investigated. An image-computerized analysis was made for measurements of axons. Based on the findings we concluded that damage to axons appears in both the minute MS lesions and in shadow plaques. Demyelination and ineffective (too late or too slow) remyelination seemed to be very important factors in axonal damage. Irreversible damage to axons may appear in both the secondary progressive and relapsing-remitting stages of MS, causing permanent neurological deficits, irrespective of the duration of the disease.