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Open access

Andrea del Toro-Diez, Ernesto Solá-Sánchez, and Michelle Mangual-García


Primary hypothyroidism is one of the most common endocrine disorders with widely available treatment. A minority of patients remain with uncontrolled hypothyroidism despite therapy. The objective of this case series was to demonstrate that medication non-adherence, rather than malabsorption, should be sought as the most common cause of unsuppressed TSH levels in patients receiving treatment for this condition. Non-adherence is often considered as a diagnosis of exclusion. Nonetheless, a diagnosis of malabsorption requires a more extensive workup, including imaging and invasive procedures, which increase healthcare costs and burden to the patient. The findings of this study allow for a cost-effective approach to uncontrolled hypothyroidism.

Learning points

  • Medication non-adherence is a common cause of insuppressible TSH levels.

  • Once weekly levothyroxine is an alternative approach to non-compliant patients.

  • Assessing compliance is more cost-effective and less burdensome than testing for malabsorption.

Open access

Nicolás Cruz-Dardíz, Nadyeschka Rivera-Santana, Marina Torres-Torres, Héctor Cintrón-Colón, Shayanne Lajud, Ernesto Solá-Sánchez, Michelle Mangual-García, and Alex González-Bóssolo


Lingual thyroid (LT) gland is the most common type of ectopic thyroid tissue, but it is an extremely rare presentation. We present a case of a 41-year-old Hispanic female patient complaining of dysphonia and dysphagia. As part of the evaluation, fiber optic flexible indirect laryngoscopy (FIL) was performed which revealed a mass at the base of the tongue. The morphological examination was highly suspicious for ectopic thyroid tissue and the diagnosis was confirmed with neck ultrasound and thyroid scintigraphy. Although the patient presented subclinical hypothyroidism, levothyroxine therapy was initiated with a favorable response which included resolution of symptoms and mass size reduction. Our case portrays how thyroid hormone replacement therapy (THRT) may lead to a reduction in the size of the ectopic tissue and improvement of symptoms, thus avoiding the need for surgical intervention which could result in profound hypothyroidism severely affecting the patients’ quality of life.

Learning points:

  • Benign LT and malignant LT are indistinguishable clinically and radiographically for which histopathology is recommended.

  • THRT, radioactive iodine 131 (RAI) therapy, and surgical excision are potential management options for LT.

  • THRT may lead to size reduction of the ectopic tissue and resolution of symptoms avoiding surgical intervention.