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Vol. 53. Issue 4.
Pages 264-267 (October - December 2020)
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Vol. 53. Issue 4.
Pages 264-267 (October - December 2020)
Brief report
Bone metastasis of papillary thyroid carcinoma simulating a pulmonary origin. Unusual immunohistochemistry leading to misdiagnosis
Metástasis ósea de cáncer papilar de tiroides simulando un origen pulmonar. Inmunohistoquímica inusual que conduce a un diagnóstico equívoco
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Fernando Durán Botíaa,
Corresponding author
fduranbotia@gmail.com

Corresponding author.
, María Jesús Fernández-Aceñeroa, Irene Ruiz Adelantadoa, Paz de Miguelb, Ángel Molinoc, Luis Ortega Medinaa
a Department of Pathology, Hospital Universitario Clínico San Carlos, Calle del Profesor Martín Lagos s/n, 28040 Madrid, Spain
b Department of Endocrinology, Hospital Universitario Clínico San Carlos, Spain
c Department of Internal Medicine, Hospital Universitario Clínico San Carlos, Spain
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Abstract

Immunophenotypical features from tumors can be variable and, sometimes, confusing. We herein report a 61 year old woman with two foci of papillary thyroid microcarcinoma who developed a bone lesion four months after total thyroidectomy/central lymphadenectomy (mpT1aN0), with an immunohistochemical pattern suggestive of a pulmonary rather than a thyroid origin (CK7, napsin-A and TTF1 positive; and negative thyroglobulin). Further biomarkers (HBME-1 and PAX8) were performed in order to confirm primary tumor, leading to conclusion of a bone metastasis from thyroid papillary carcinoma. We believe it is always advisable to perform more than one biomarker as part of a panel to get a more reliable diagnosis.

Keywords:
Thyroid gland
Papillary carcinoma
Immunohistochemistry
PAX-8
HBME-1
Napsin-A
Bone metastasis
Resumen

Las características inmunofenotípicas de los tumores pueden ser variables y, a veces, confusas. Reportamos el caso de una mujer de 61 años con 2 focos de microcarcinoma papilar de tiroides, que desarrolló una lesión ósea a los 4 meses de practicarse tiroidectomía total/linfadenectomía central (mpT1aN0), con patrón inmunohistoquímico sugerente de origen pulmonar en lugar de tiroideo (CK7, napsina-A y TTF1 positivos, y tiroglobulina negativa). Se analizaron biomarcadores adicionales (HBME-1 y PAX8) para confirmar el tumor primario, llegándose a la conclusión de metástasis ósea por cáncer papilar de tiroides. Creemos que es siempre recomendable analizar más de un biomarcador como parte de un panel, para obtener un diagnóstico más fiable.

Palabras clave:
Glándula tiroides
Carcinoma papilar
Inmunohistoquímica
PAX-8
HBME-1
Napsina-A
Metástasis ósea

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