Extra-osseous Ewing sarcoma of the thyroid gland mimicking lymphoma recurrence: A case report

Elena Maldi, Guido Monga, Davide Rossi, Antonella Tosoni, Rosanna Mezzapelle, Renzo Boldorini

Research output: Contribution to journalArticlepeer-review


Extra-osseous Ewing sarcomas/peripheral primitive neuroectodermal tumors (EOES/pPNETs) are high-grade malignant tumors found in various organs, such as the lung, skin, intestine, kidney and female genital tract; however, to the best of our knowledge, only two cases have previously been identified in the thyroid gland. We describe a case of primary EOES/PNET of the thyroid gland in a 66-year-old man with a previous history of large B cell lymphoma. During a routine follow-up examination, the patient underwent an ultrasound cervical scan showing a solid nodule of the left thyroid lobe. The fine-needle aspiration biopsy of the nodule suggested a neuroendocrine tumor. Histological and immunohistochemical examination of the surgical specimen supported a diagnosis of EOES/PNET, which was further confirmed by the demonstration of EWSR1 gene translocation by means of fluorescent in situ hybridization and by the detection of glycogen particles and neurosecretory granules by means of electron microscopy. Total body computed tomography and magnetic resonance imaging excluded the involvement of other sites, and therefore a diagnosis of primary EOES/PNET of the thyroid gland was made.This paper also discusses the main differential diagnoses, including lymphoma recurrence, other small round cell tumors (primary or metastatic), and a thyroid localization of an EWS/PNET from another organ.

Original languageEnglish
Pages (from-to)356-359
Number of pages4
JournalPathology Research and Practice
Issue number6
Publication statusPublished - Jun 15 2012


  • Cytology
  • Electron microscopy
  • Ewing sarcoma
  • Florescence in situ hybridization
  • Thyroid

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Cell Biology


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