title: A case of thyroid metastasis from pancreatic cancer: case report and literature review.
abstract: BACKGROUND
  Thyroid metastases are clinically rare, and usually occur in patients with a history of prior malignancy and when there are metastases elsewhere. Metastases of pancreatic carcinoma to the thyroid are extremely rare, with only three cases reported in the literature.
  
  
  METHODS
  We report a patient who had a pancreatic carcinoma with metastasis to the thyroid as initial clinical presentation of the disease. A 63-year-old man with a history of weight loss and fatigue presented with cervical lymphadenopathies and a large nodule in the right lobe of the thyroid. A fine needle aspiration of the nodule gave inconclusive cytological results for the origin of the neoplastic cells. An ultrasound-guided core biopsy revealed the presence of a poorly differentiated adenocarcinoma infiltrating the thyroid with atrophic thyroid follicles. Immunohistochemical staining of the lesion was strongly positive for Cytokeratin 19 suggesting a pancreatic origin of the metastasis. A contrast CT scan demonstrated an enlargement of the pancreatic body, dilatation of the pancreatic duct, diffuse retroperitoneal, paraaortic and cervical lymphadenopathy and secondary lesions in the liver.
  
  
  CONCLUSIONS
  Metastases to the thyroid from pancreatic carcinoma are extremely rare. A core biopsy of the lesion excluded a thyroid carcinoma and permitted the diagnosis of the primary neoplasm.
authors.affiliation: Department of Biomedical Science, University of Sassari, Sassari, Viale San Pietro 8, 07100 Sassari, Italy. aledelitala@tiscali.it.
authors.forename: Alessandro P
authors.initials: AP
authors.lastname: Delitala
authors.forename: Gianpaolo
authors.initials: G
authors.lastname: Vidili
authors.forename: Alessandra
authors.initials: A
authors.lastname: Manca
authors.forename: Upinder
authors.initials: U
authors.lastname: Dial
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Delitala
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Fanciulli