Thymic hypoplasia
Encyclopedia
Thymic hypoplasia is a condition where the thymus
Thymus
The thymus is a specialized organ of the immune system. The thymus produces and "educates" T-lymphocytes , which are critical cells of the adaptive immune system....

 is underdeveloped or involuted.

Calcium levels can be used to distinguish between the following two conditions associated with thymic hypoplasia:
  • 22q11.2 deletion syndrome: hypocalcemia
  • Ataxia telangiectasia
    Ataxia telangiectasia
    Ataxia telangiectasia is a rare, neurodegenerative, inherited disease that affects many parts of the body and causes severe disability. Ataxia refers to poor coordination and telangiectasia to small dilated blood vessels, both of which are hallmarks of the disease...

    : normal levels of calcium
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