Diffuse Sclerosing Variant of Papillary Thyroid Carcinoma Presenting as Suspected Cervical Osseous Metastasis : A Case Report and Literature Review

Background: The diffuse sclerosing variant of papillary thyroid carcinoma (DSV-PTC) is an uncommon variant of PTC. Although its histologic features are aggressive, its prognostic significance remains controversial. Case summary : Bone scan of 41-year-old woman with a history of breast and thyroid cancers showed suspected cervical osseous metastasis during the previous cancer follow-up. Further, magnetic resonance imaging was recommended. Preoperative fine needle aspiration cytology showed features of thyroid papillary carcinoma and postoperatively, the mass was diagnosed to DSV-PTC showing features of numerous and diffuse calcification and squamous metaplasia. Conclusion: Herein, we describe the pathologic features, including histologic and fine-needle aspiration cytologic features, and prognostic implications through a literature review.