Thyroid Collision Tumor Comprising of Papillary and Follicular Carcinoma: A Diagnostic and Therapeutic Conundrum

Thyroid cancers are the most prevalent type of endocrine cancers. Furthermore, the most prevalent type of thyroid cancers is differentiated thyroid cancers, which include follicular and papillary varieties. A combination of two primary cancers within the same thyroid gland is exceedingly rare. The co-occurrence of these tumor forms in the same gland remains a mystery. It is currently acknowledged that, in comparison to either of the tumors developing alone, these tumors should be regarded as more aggressive and carrying a higher chance of recurrence. Although each patient should receive a customized course of care, there are currently no established standards for diagnosis or therapy because there is insufficient data regarding their behavior. We describe a case as well as a review of all cases of papillary carcinoma collision and follicular carcinoma (FTC) in the thyroid that have been documented to date.