ArticleJournal of surgical case reports2026
Collision thyroid tumors: a case report of coexisting papillary and follicular carcinoma.
Article in Journal of surgical case reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Collision tumors of the thyroid gland are defined by the coexistence of two or more histologically and morphologically distinct neoplasms, separated by normal thyroid tissue. This phenomenon is rare, with the most frequently reported combination being the coexistence of medullary carcinoma and papillary carcinoma. This case reports a 73-year-old female patient with an asymptomatic thyroid nodule. Ultrasonographic examination revealed a solid, isoechoic, well-defined nodule with a halo and peripheral vascularization, measuring 4.3 × 2.5 cm in the left lobe. Fine-needle aspiration cytology classified the nodule as Bethesda IV (follicular tumor). Following total thyroidectomy, histopathological analysis identified papillary carcinoma in the isthmus and minimally invasive follicular carcinoma in the left lobe.
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