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An autosomal dominant syndrome most often caused by heterozygous inactivating mutations in a potential tumor suppressor gene, PRKAR1A, encoding cAMP-dependent protein kinase type I-alpha regulatory subunit. This condition is characterized by increased risk of myxomas in the heart, psammomatous melanotic schwannomas and letigines, and tumors in many endocrine organs. A distinctive feature of this condition is primary pigmented nodular adrenocortical disease (PPNAD), which results in hyperadrenocortisolism. Pituitary gland involvement includes functional pituitary adenomas that result in excess growth hormone production.
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