Many, maybe related: Spleen can be small either because it never grew (as baby/child) or because it was injured and became scarred. If problem started young enough, thymus can take over some of the spleen's work to compensate (so becomes bigger). Spleen filters old/damaged blood cells and helps produce new ones, filters out certain infections and has other immune functions; thymus is an important part of immune system.
Answered 11/28/2017
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