Mature cystic teratoma with high proportion of solid thyroid tissue: a controversial case with unusual imaging findings

Authors

  • Rui Tiago Gil
  • Teresa Margarida Cunha
  • Ines Rolim

DOI:

https://doi.org/10.3941/jrcr.v11i7.2853

Keywords:

Urogenital neoplasms, Ovary, Teratoma, Thyroid gland, Magnetic Resonance Imaging

Abstract

We describe a case of a mature cystic teratoma of the ovary with high proportion of solid thyroid tissue (< 50% of the entire tumor) in a childbearing woman. The patient presented with non-specific abdominal bloating. Pelvic ultrasound and magnetic resonance imaging revealed a complex cystic-solid tumor confined to the left ovary with an anterior fat-containing locus compatible with mature cystic teratoma and a posterior predominantly solid component with low signal intensity on T2-weighted images that was histopatologically diagnosed as benign thyroid tissue. Thyroglobulin levels were in normal range. Although thyroid tissue is present in up to 20% of mature cystic teratomas, with exception of struma ovarii, it is not usually macroscopically nor radiologically identified.  The differential diagnosis should include T2-hypointense adnexal lesions associated with mature cystic teratoma, malignant transformation of mature teratoma, and immature teratoma.

Author Biographies

Rui Tiago Gil

Servií§o de Radiologia

Instituto Portugues de Oncologia de Lisboa Francisco Gentil

Teresa Margarida Cunha

Servií§o de Radiologia

Instituto Portugues de Oncologia de Lisboa Francisco Gentil

Ines Rolim

Servií§o de Anatomia Patologica

Instituto Portugues de Oncologia de Lisboa Francisco Gentil

Published

2017-07-26

Issue

Section

Genitourinary Radiology