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Thyroid lymphoma: diagnostic pitfalls on pre-operative ago-biopsy.

BACKGROUND
Thyroid cancer has the highest prevalence of all endocrine malignancies. Malignancy can be of thyroid or non-thyroid origin. Sarcomas and primary thyroid lymphomas (PTL) are rare and surgery is treatment of choice in the former but not in latter.


OBJECTIVE
To describe thyroid lymphomas histological types of thyroid cancer found in a reference center.


METHODS
Medical chart review from admitted patients diagnosed with thyroid cancer in the period from january 2007 to june 2012. Demographic, diagnostic, therapeutic and histopathological information were collected.


RESULTS
1604 records of patients admitted with thyroid disease were reviewed. Among 307 thyroid cancer, the cases diagnosed with rare tumors were: 10 cases of anaplastic carcinoma (3.5%), followed by 4 cases of medullary carcinoma (1.3%), 1 cases of teratoma (0.03%), 2 cases of lymphoma (0.06%). The most frequent clinical presentation was a palpable thyroid nodule. All patients with lymphoma died.


CONCLUSION
Thyroid lymphomas are uncommon and tend to worse outcomes.