ISSN 1849-9031 (Online)

ISSN 1849-8922    (Print)

Late recurrent papillary thyroid carcinoma presenting as thymoma.
Gordana Drpa, Bernard Budimir, Sanja Kusačić Kuna, Suzana Kukulj.

Abstract


Papillary thyroid carcinoma is the most common thyroid tumor, although generally rare. It has a good outcome because it rarely metastasizes, and if it does, it is characterized by local spread. Recurrence is also infrequent and usually occurs within three to fve years afer primary tumor treatment, although late relapses have been reported sporadically. Thymoma is another rare neoplasm. As it has a typical radiological presentation in the upper anterior mediastinum, biopsies are unnecessary because it is unlikely that the postoperative pathohistological fnding will be surprising. We describe a rare case of a late recurrent papillary thyroid carcinoma presenting as a mediastinal mass, twenty-one years afer the primary carcinoma. Because of the long interval between thyroid carcinoma treatment and appearance of the new tumor mass, with characteristic features, thymoma was suspected. However, the postoperative pathohistological fndings revealed that the tumor was a papillary thyroid carcinoma metastasis, probably originating from a mediastinal lymph node. To our best knowledge, this is the second reported case of this kind.