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Source 1: 2007 MP/H Rules
MP/H Rules/Primary site: What is the primary site and histology for a focus of papillary thyroid cancinoma, follicular variant, arising in thyroid tissue of mature cystic teratoma of the ovary?
The primary site is ovary and the histology is papillary carcinoma, follicular variant 8340/3.
This neoplasm is arising in a teratoma. Teratomas are unusual in that they contain all three germ cell layers from which an embryo forms. It is not unusual to have malignancies that are usually primary to the thyroid, liver, brain, lung, etc., originate in a teratoma.