Splenic arteriolar hyalin in children.

Sections from 447 children's spleens were examined for arteriolar hyalin. Hyalin is not found in the first year of life, but by the fifth year of life 60 per cent of cases show it. The positive cases include a wide variety of pathological conditions. The development of arteriolar hyalin in the spleen is age dependent, occurs early in life, and is not a pointer to any particular pathological condition.