What are the different types of pituitary tumors?

  • Microadenomas are smaller than 1 cm (1/2 inch) in size.
  • Macroadenomas are larger than 1 cm (1/2 inch) in size.
  • Carcinomas are cancerous tumors. They are very rare and can be different sizes.

Pituitary tumors can be either functioning (that release hormones) or non-functioning (that do not release hormones). Functioning pituitary tumors make too much of one or more hormones usually made by the pituitary gland. These include prolactin, growth hormone, ACTH and thyroid stimulating hormone.

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Rev. 11/2019. MassGeneral Hospital for Children and Massachusetts General Hospital do not endorse any of the brands listed on this handout. This handout is intended to provide health information so that you can be better informed. It is not a substitute for medical advice and should not be used to treatment of any medical conditions.