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Ectopic Cervical Thyroid Tissue Affected by Fibrosing Hashimoto's Thyroiditis Mimicking Multifocal Metastatic
Hui Min Tan1, Min En Nga1, Fredrik Petersson2
1Department of Pathology, National University Hospital, 5 Lower Kent Ridge Road, Singapore, 119074, Singapore.
Abstract:
We describe a case of ectopic cervical thyroid tissue which was involved by fibrosing Hashimoto's thyroiditis and which mimicked metastatic papillary thyroid carcinoma both on fine needle aspiration cytology and biopsy. The patient underwent total thyroidectomy which revealed fibrosing Hashimoto's thyroiditis, but no carcinoma. The entire thyroidectomy specimen was submitted for histopathological assessment. Even in the resected thyroidectomy specimen, there were cytological changes that were strongly reminiscent of papillary thyroid carcinoma. However, interpreted in the correct clinico-pathological context, these cytological alterations were deemed to be reactive secondary to the fibro-inflammatory process.
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