18 F-Fluorocholine PET-CT Outshines Sestamibi Scintigraphy in Detecting Parathyroid Adenomas in the Background of Hashimoto's Thyroiditis

Ultrasonography neck and dual-phase 99m Tc-sestamibi (MIBI) scan are standard imaging techniques for the detection of parathyroid adenomas in primary hyperparathyroidism. However, in presence of coexistent thyroid disease or small size of adenomas, the accuracy of these imaging modalities is low and leads to delayed diagnosis. We here present a report of two patients with primary hyperparathyroidism and with a nondiagnostic MIBI scan, who subsequently underwent successful surgery after positive localization of adenomas on 18 F-fluorocholine positron emission tomography-computed tomography.

Analysis of Trustworthiness and Readability of English and Spanish Hypo- and Hyperthyroid-Related Online Patient Education Information

This study aims to determine the readability and trustworthiness of English and Spanish hypo- and hyperthyroid-related online information. Google searches were conducted for four search terms: hypothyroidism, Hashimoto's Disease, hyperthyroidism, and Graves' Disease. For each search term, the first 10 websites were analyzed with a total of 40 websites analyzed. Readability formulas were used to determine English and Spanish readability. Trustworthiness was determined using HONcode status, JAMA Benchmark Criteria, and NLM Trustworthy Score. Overall readability largely exceeded recommended grade levels. Only 1 website (2.5%) presented information below the eighth-grade reading level based on overall Readability Consensus score, while 31 websites (77.5%) exceeded this threshold for all measures. The mean (SD) English readability grade level was 9.6 (3.44); the mean (SD) Spanish grade was 8.5 (4.58). No significant relationships were found between the JAMA Benchmark Criteria, NLM Trustworthy Score, HONcode status, and readability. 67.5% of websites analyzed (n = 27) were certified with the Health on the Net Foundation's code of conduct. Websites about common thyroid-related conditions have overall poor readability. The availability of resources for Spanish-speaking patients is also poor. Steps should be taken to ensure that online health-related materials are comprehensible. Physicians should recognize that patients may have few trustworthy and easy-to-understand sources to access information. The readability and trustworthiness of sources should be considered when providing patients suggested sources for further reading. It may be particularly helpful for physicians to utilize websites with favorable readability scores such as the American Thyroid Association website.

Hypothyroidism: Diagnosis and Evidence-Based Treatment

Hypothyroidism affects up to 5% of the global population. Incidence increases with age and is more common in women and individuals with prolonged estrogen exposure when compared with people who have not been exposed to estrogen. Symptoms can develop slowly and often mimic symptoms of other disorders, including menstrual cycle abnormalities. Understanding risk factors and common presenting symptoms is important in providing high-quality primary and reproductive care. Diagnosis relies on simple-to-obtain, fairly inexpensive testing of thyroid-stimulating hormone (TSH) levels and confirmation with levels of thyroxine. Management of hypothyroidism usually involves monotherapy with levothyroxine taken on an empty stomach. There are 2 methods for beginning levothyroxine treatment, and outpatient primary care clinicians can use shared decision-making to determine the best initiation method for each individual. Follow-up involves regular assessment of levels of TSH and symptom relief. Although some patients may need referral for specialist treatment, the majority of individuals with hypothyroidism can be diagnosed and treated by their outpatient primary care providers.

Chronic Lymphocytic Thyroiditis and Aggressiveness of Pediatric Differentiated Thyroid Cancer

OBJECTIVES/HYPOTHESIS

Hashimoto's Thyroiditis (HT) is a common cause of hypothyroidism. Among adults with differentiated thyroid cancer (DTC), HT appears to be associated with less severe disease burden. In the absence of information regarding HT and disease burden among children with DTC, we assessed the relationship between pediatric DTC severity and HT.

STUDY DESIGN

Retrospective cohort.

METHODS

Charts from 90 pediatric patients who underwent surgical removal of DTC from 2002 to 2017 at tertiary-care children's hospital were reviewed. Demographic, clinical, surgical, pathology, and outcome details were compared between patients with and without HT. Consistency among diagnostic modalities of HT was also evaluated.

RESULTS

Median age at presentation was 16.0 years (range 4.2-18.9 years). Twenty-two patients were male (24%). Forty-five patients (50%) had HT based on presence of thyroid autoantibodies and/or surgical pathology findings and 45 patients did not have HT. Patients with HT had increased odds of microcalcifications (odds ratio [OR]: 3.01, P = .031) and decreased odds of palpable nodules (OR: 0.212, P = .024) and T2 lesions (vs. T1) (OR: 0.261, P = .015) compared with non-HT. No significant differences in demographics and the incidence of multifocality, extrathyroidal extension, lymphovascular invasion, lymph node or pulmonary metastases, disease recurrence, or radioactive iodine treatment were found between the two groups. Thyroglobulin/thyroid peroxidase autoantibodies and surgical pathology indicative of HT were concordant in 82.4% (κ = 0.635, P < .001).

CONCLUSION

HT was present in 50% of children with DTC. Patients with DTC and HT presented with smaller tumors compared to non-HT patients. No significant differences in other markers of disease aggressiveness were found between the two groups.

LEVEL OF EVIDENCE

3 Laryngoscope, 2021.

Novel presentation of autoimmune polyglandular syndrome II in a child with simultaneous Addison's disease, type 1 diabetes, and Hashimoto's thyroiditis: A case report

Providers should remain vigilant of autoimmune polyglandular syndrome type II in the context of persistent low blood sugar in type I diabetes. Correction of adrenal insufficiency is key for regulation of blood sugar and thyroid function.

The Year in Medical Thyroidology Review: Current Challenges and Future Directions

This is a summary of the American Thyroid Association's Opening Session at the 89th Annual Meeting in October 2019. This review highlights the most clinically impactful articles in medical thyroidology published from January 2018 through September 2019.

Levothyroxine Replacement Therapy and Overuse: A Timely Diagnostic Approach

BACKGROUND

Levothyroxine (LT4) is one of the most prescribed drugs worldwide. Once started, approximately 90% of patients continue treatment long term. However, accumulating evidence suggests that many patients, for whom the indication for its administration is not adequately established and the diagnosis is not well documented, are overusing it. This study aimed to evaluate the necessity for and determine potential prognostic factors of long-term LT4 supplementation.

METHODS

A prospective clinical cohort follow-up study was carried out. In 291 subjects (84% females) aged 48 ± 16 years on LT4 replacement therapy without a solid diagnosis of hypothyroidism being provided, the treatment was paused. At the beginning and after six to eight weeks of treatment discontinuation, thyrotropin (TSH) and free thyroxine levels were assessed, and thyroid ultrasound was performed. A TSH value of ≥4.5 IU/mL was considered as underlying hypothyroidism.

RESULTS

Among the 291 individuals, 114 became hypothyroid (group A), while 177 subjects remained euthyroid off LT4 (group B; 39.2% vs. 60.8%, p < 0.001). The groups were comparable regarding sex, family history, age, body mass index, duration of treatment, basal TSH and free thyroxine values, thyroid volume, and presence of thyroid autoantibodies. However, diffuse inhomogeneous echogenicity on ultrasound examination was significantly higher (p < 0.001) in group A.

CONCLUSIONS

These findings suggest considerable overuse of thyroxine therapy. The results underline the initial need to establish the diagnosis firmly before treatment initiation and to undertake periodic evaluation of all patients on chronic LT4 treatment as to the necessity for treatment continuation. In all patients on long-term LT4 therapy in whom the diagnosis has not been definitively established, it appears rational to introduce a six- to eight-week period of LT4 replacement therapy discontinuation, preceded and followed by TSH tests, as the first-line approach-a procedure that could be implemented as part of a common strategy among the scientific community to decrease current LT4 overuse.

Earliest depiction of vitiligo in "Venus at a Mirror" (1615) by Peter Paul Rubens (1577-1640)

The 1615 painting of Venus at a Mirror by Peter Paul Rubens is considered a powerful example of the Flemish Baroque movement. Recently it has been identified that the Venus character in the image has a goitre, however on studying the image further, I note dermato-pathology in another of the painting's main characters; the dark-skinned female typically described as the Venus' maidservant who clearly demonstrates patches of skin pigment loss on her face and neck with a concurrent streak of white hair. Together these suggest the underlying diagnosis of vitiligo. There is also a goitre in this individual suggesting thyroid disease. This new finding may offer additional insight into the historical epidemiology of disease in northern Europe but also offers further understanding of the method, origin, and pathological associations of this prominent painting from a genius artist.

Immunoregulatory T cells, LFA-3 and HLA-DR in autoimmune thyroid diseases

AIM

The aim of the present study was to examine the changes in the expression of T-cell activation markers, namely CD4+ CD25+ and CD8+ in patients with AITD, namely Graves' disease and Hashimoto's thyroiditis as well as colloid nodular goitre. HLA-DR, LFA-3, and peripheral total lymphocytic count are also measured.

MATERIALS AND METHODS

We compared the expression of CD4, CD25, and CD8 surface markers in peripheral blood lymphocyte in Graves' disease and Hashimoto's thyroiditis as autoimmune thyroid diseases, as well as colloid goitre in comparison with healthy controls. Also, LFA-3 and HLA-DR were measured in the same groups using three-color flow cytometry. Total lymphocytic count in peripheral blood, thyroid function tests, antithyroid antibodies were also included in the laboratory investigations. The total number of participants was 65. All were recruited from endocrine clinics in a tertiary care hospital in the southern region of Saudi Arabia. All participants underwent history taking, clinical examination, laboratory workup, and radiological investigations. Neck ultrasound, technecium pertechnetate(ψψ) thyroid uptake, and fine-needle aspiration and cytology (FNAC) of the thyroid were done when indicated. The study was approved by the Hospital Research Isthics Committee and informed consents were obtained from all participants before enrollment in the study.

RESULTS

In comparison with thecontrol group, activation markers CD4, CD25, and CD8 were lower in the autoimmune thyroid diseases. Lymphocyte function antigen-3 (CD58) and total lymphocytic count were higher in the AIT diseases whereas HLA-DR was lower than that in the control group. The CD4/CD8 ratio was lower in the AITD compared with the healthy euthyroid subjects. No difference was found between patients with colloid nodular goitre and the healthy control in any of the study variables except for LFA-3 which was significantly higher in the colloid goitre group.

CONCLUSION

Our findings indicate downregulation of CD4+ CD25+ Treg as well as CD8+ T cells in autoimmune thyroid diseases. Downregulation of suppressor T lymphocytes helps initiation, progression, and maintenance of the autoimmune thyroid diseases. Lower HLA-DR and higher CD58 in AITDs indicate their role in the expression of the autoantigen and its escape from the immune surveillance. High levels of LFA-3 in colloid goitre indicate that the autoimmune process needs interacting factors, and not only the high level of LFA-3.