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Papillary thyroid microcarcinoma (PMC) is defined as a papillary carcinoma 1 cm or less in size. PMC is a variant of papillary carcinoma, the most common thyroid cancer, which has a very good prognosis and in which distant metastases and death (0.4–1% per year) are exceptional. 1

We report a patient who was diagnosed with metastasis of a papillary microcarcinoma as the result of an evaluation of a mediastinal mass. This was an asthmatic patient aged 38 years with no history of neck irradiation or family history of thyroid cancer. The surgery department referred the patient to the endocrinological department after surgery for a cystic tumor, 7 cm in diameter, in the posterosuperior mediastinum (Figure 1, Figure 2) after the histological study reported the finding in an intraoperative biopsy of a cystic wall of fibrous tissue with thyroid follicles without atypia and associated lymphocyte infiltrate consistent with …