familial medullary thyroid carcinoma (Monarch Disease Ontology id MONDO_0007958) can be described as follows. An instance of thyroid medullary carcinoma that is caused by an inherited modification of the individual's genome. Also known as: familial MTC, hereditary medullary thyroid gland carcinoma, hereditary thyroid medullary carcinoma, thyroid carcinoma, familial medullary.