Ectopic thyroid microfollicular adenoma in the lung
Ectopia thyroid tissue is a rare clinically condition with an estimated prevalence of 1/100,000 to 300,000 in the general population, increasing to 1/4,000 to 8,000 in patients with thyroid dysfunction. It occurs as a result of a developmental abnormality during the migration of the thyroid anlage from the floor of the primitive foregut to its final position in the neck.

A female patient at the age of 76 was admitted to our hospital due to a 2-hour transient unconsciousness. Her medical history was unremarkable, and she did not show any symptoms of hypothyroidism or hyperthyroidism. No pulmonary symptoms, such as coughing, hemoptysis, and dyspnea were observed. No abnormality was found during thyroid palpation inspection. Results of thyroid function tests (free T3, free T4, and thyroid-stimulating hormone (TSH)) were within normal range. Pelvic ultrasound (US) showed a range of 13.3 × 7.9 cm, a well-defined cystic lesion with dense septations.

Meanwhile, solid papillary protuberance and blood flow signals were seen in part of cysts. Thickened endometrium and multiple uterine small cysts were detected in US. Magnetic resonance imaging (MRI) showed multiple well-defined cystic mass in pelvic without obvious enhancement. It appeared hypointense on T1WI, hyperintense on T2WI, and hypointense on DWI. Later on, the patient underwent laparoscopic double adnexectomy and hysterectomy. Pathological description revealed bilateral ovarian serous cystadenoma and endometrioma.

Source: Medicine: August 2019

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