Ectopic thyroid in the gallbladder accompanied with gallbladder adenoma: A case report.

RATIONALE: Ectopic thyroid is most common in the tongue. Here we reported a rare case of thyroid tissue located in the gallbladder wall, accompanied with adenoma and a cyst lined with pseudostratified ciliated columnar epithelium in the neck region of gallbladder neck.

PATIENT CONCERNS: A 39-year-old female presented with recurrent upper abdominal pain and radiating back pain.

DIAGNOSES: Based on ultrasonography, gallbladder polyps and calculous cholecystitis were suspected.

INTERVENTIONS: The patient was treated by laparoscopic cholecystectomy, and thyroid tissue located in the gallbladder wall was found. Histopathological examination showed no features of papillary thyroid neoplasm.

OUTCOMES: The patient had no thyroid nodules or suspicious enlarged lymph nodes, and no other symptoms or complications by follow-up for 2.5 years up to September 2019.

LESSONS: We should pay attention to the rare location of ectopic thyroid tissue in the gallbladder and rule out primary thyroid malignancy to avoid unnecessary overtreatment.