An intracardiac accessory thyroid gland mimicking cardiac tumor: A case report and literature review.

RATIONALE: An accessory thyroid gland (ATG) in the right ventricle is an extremely rare condition. Described herein are histological findings of ATG in the right ventricle found in a patient with a normal cervical thyroid gland.

PATIENT CONCERNS: A 53-year-old woman was referred to our hospital after experiencing intermittent precordial pain for 2 years.

DIAGNOSES: The mass in the right ventricle was diagnosed pathologically as ATG.

INTERVENTIONS: Complete excision was performed because of the patient's intermittent precordial pain and to exclude the possibility of malignancy.

OUTCOME: The patient's pain was resolved. No recurrence was observed during the 6-month follow-up.

LESSONS: After review and analysis of the case, we found that plain and contrast-enhanced computed tomography scans showed that the mass had a similar intensity and enhancement to a cervical thyroid gland, which we think may be a useful clue for making a preoperative diagnosis of ATG.