Collision tumor of the thyroid gland: Follicular carcinoma and papillary microcarcinoma

Collision tumor represents the proximal coexistence of two histologically distinct tumors. The combination different types tumors in a single thyroid gland is extremely unusual. We reported case follicular carcinoma and papillary microcarcinoma occur independently as primary separated by normal tissue 59- year- old Saudi female, presented at clinic with goiter for months duration without symptoms hormonal disorders. This one few cases to be combined English literature.