To the Editor: Poorly differentiated thyroid cancers are rareand can be difficult for surgeons, endocrinologists, and pathologiststo identify.1 These cancers fall into two main histologic categories:insular and other (large cell). Most, but not all, stain withthyroglobulin or thyroid transcription factor 1; those thatdo not represent particular diagnostic challenges.1,2,3 We describea 60-year-old man who presented with bilateral cervical lymphadenopathyand an enlarged thyroid. Biopsy specimens of cervical nodesand the thyroid gland showed features of poorly differentiatedadenocarcinoma of unknown primary origin — possibly pulmonary,colorectal, pancreatic, or thyroidal. Immunostaining for thyroglobulinand thyroid transcription . . . [Full Text of this Article]
Magner, J., Juweid, M., O'Dorisio, T., Milhem, M.
(2008). Problems Associated with the Use of Thyrogen in Patients with a Thyroid Gland. NEJM
359: 1738-1739
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