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Figure 1: (a) Fine-needle aspiration thyroid showed a background of cystic lesion (foamy cells) with few of neoplastic cells and a sheet of degenerative follicular cells (Papanicolaou stain, ×400), (b) cell block preparation showed the immunoreactivity to thyroglobulin was false positive and was seen in the contaminated thyroid follicular cells/background but not in the neoplastic cells (immunohistochemical stain for thyroglobulin, ×400), (c) neoplastic cells showed positive nuclear stained pattern (immunohistochemical stain for thyroid transcription factor 1, ×400)

Figure 1: (a) Fine-needle aspiration thyroid showed a background of cystic lesion (foamy cells) with few of neoplastic cells and a sheet of degenerative follicular cells (Papanicolaou stain, ×400), (b) cell block preparation showed the immunoreactivity to thyroglobulin was false positive and was seen in the contaminated thyroid follicular cells/background but not in the neoplastic cells (immunohistochemical stain for thyroglobulin, ×400), (c) neoplastic cells showed positive nuclear stained pattern (immunohistochemical stain for thyroid transcription factor 1, ×400)