Chronic hypoparathyroidism is associated with increased cortical bone density evaluated using high-resolution peripheral quantitative computed tomography.

PURPOSE: This cross-sectional study aimed to assess bone mineral density (BMD), bone microarchitecture and fracture prevalence in women with chronic postsurgical hypoparathyroidism (hypoPT). METHODS: Twenty-seven women with postsurgical hypoPT and 44 age-matched healthy women were included. Dual-energy X-ray absorptiometry was used to evaluate areal BMD and vertebral fracture assessment. High-resolution peripheral quantitative computed tomography assessed microarchitecture and volumetric BMD at the distal radius and tibia. Biochemical parameters, including fibroblast growth factor 23, C-terminal cross-linking telopeptide of type I collagen (ICTP), and procollagen type I N-terminal propeptide (P1NP), were also measured. Previous low-impact fractures were assessed and the 10-year fracture risk was estimated using the FRAX tool for the Brazilian population. RESULTS: No participant had prevalent clinical fractures, and both groups showed low risk for major and hip based on FRAX tool, but two hypoPT patients had moderate to severe morphometric vertebral fractures. Women with hypoPT had increased aBMD in the lumbar spine, femoral neck and total hip (p < 0.05) and higher cortical vBMD in the radius (p = 0.020) and tibia (p < 0.001). Trabecular bone was not affected. Both P1NP and ICTP suggested low bone turnover rates, but no significant correlation was observed between bone density or microstructure and any of the biochemical parameters. CONCLUSIONS: The prevalence of fragility fractures was low in HypoPT women and compatible with low fracture risk estimated by the FRAX tool. Patients had a higher aBMD and cortical vBMD than those of healthy control women, but the association with decreased bone turnover remains unclear.

Preoperative ultrasound identification and localization of the inferior parathyroid glands in thyroid surgery.

Introduction: The parathyroid glands are important endocrine glands for maintaining calcium and phosphorus metabolism, and they are vulnerable to accidental injuries during thyroid cancer surgery. The aim of this retrospective study was to investigate the application of high-frequency ultrasound imaging for preoperative anatomical localization of the parathyroid glands in patients with thyroid cancer and to analyze the protective effect of this technique on the parathyroid glands and its effect on reducing postoperative complications. Materials and methods: A total of 165 patients who were operated for thyroid cancer in our hospital were included. The patients were assigned into two groups according to the time period of surgery: Control group, May 2018 to February 2021 (before the application of ultrasound localization of parathyroid in our hospital); PUS group, March 2021 to May 2022. In PUS group, preoperative ultrasound was used to determine the size and location of bilateral inferior parathyroid glands to help surgeons identify and protect the parathyroid glands during operation. We compared the preoperative ultrasound results with the intraoperative observations. Preoperative and first day postoperative serum calcium and PTH were measured in both groups. Results: Our preoperative parathyroid ultrasound identification technique has more than 90% accuracy (true positive rate) to confirm the location of parathyroid gland compared to intraoperative observations. Postoperative biochemical results showed a better Ca2+ [2.12(0.17) vs. 2.05(0.31), P=0.03] and PTH [27.48(14.88) vs. 23.27(16.58), P=0.005] levels at first day post-operation in PUS group compared to control group. We also found a reduced risk of at least one type of hypoparathyroidism after surgery in control group:26 cases (31.0%) vs. 41 cases (50.6%), p=0.016. Conclusion: Ultrasound localization of the parathyroid glands can help in the localization, identification and in situ preservation of the parathyroid glands during thyroidectomy. It can effectively reduce the risk of hypoparathyroidism after thyroid surgery.

Bone Marrow Adipose Tissue Is Increased in Postmenopausal Women With Postsurgical Hypoparathyroidism.

CONTEXT: Suppression of bone turnover, greater trabecular volume, and normal-high normal all-site bone mineral density (BMD) are hallmarks of postsurgical hypoparathyroidism (HypoPT). Impairment in the trabecular microarchitecture with possible higher risk of vertebral fractures (VF) in women with postmenopausal HypoPT has also been described. Currently, no data on bone marrow adipose tissue (BMAT) are available in HypoPT. OBJECTIVE: To assess BMAT by magnetic resonance imaging (MRI) and proton magnetic resonance spectroscopy (1H-MRS) in postmenopausal women with chronic postsurgical HypoPT. METHODS: This cross-sectional pilot study, conducted at an ambulatory referral center, included 29 postmenopausal women (mean age 66 ± 8.4 years) with postsurgical HypoPT and 31 healthy postmenopausal women (mean age 63 ± 8.5). Lumbar spine MRI was performed and BMAT was measured by applying PRESS sequences on the L3 body. Lumbar spine, femoral neck, and total hip BMD were measured by dual x-ray absorptiometry (DXA); site-matched spine trabecular bone score (TBS) was calculated by TBS iNsight (Medimaps, Switzerland); VF assessment was performed with lateral thoracic and lumbar spine DXA. RESULTS: Fat content (FC) and saturation level (SL%) were higher (P <.0001 and P <.001), while water content (W) was lower in HypoPT compared to controls (P <.0001). FC significantly correlated with years since menopause and body weight (P <.05) in HypoPT, while TBS negatively correlated with FC and SL% (P <.05) and positively with residual lipids (RL) and W (P <.05). CONCLUSION: We demonstrate for the first time that BMAT is increased in postmenopausal women with postsurgical hypoparathyroidism and negatively associated with trabecular microarchitecture.

The Clinical and Skeletal Effects of Long-Term Therapy of Hypoparathyroidism With rhPTH(1-84).

Hypoparathyroidism (HypoPT) is a disorder characterized by hypocalcemia, low or absent parathyroid hormone (PTH) levels, reduced bone remodeling, and high areal bone mineral density (aBMD). PTH is a therapeutic option, yet data on the prolonged clinical and skeletal effects of PTH treatment are limited. We tracked annual daily doses of calcium and active vitamin D supplements, calciotropic biochemistries, estimated glomerular filtration rate (eGFR), and aBMD measurements in 27 HypoPT patients (16 postsurgical, 11 nonsurgical) who were treated with recombinant human PTH(1-84) [rhPTH(1-84)] for at least 8 (n = 27) and up to 12 (n = 14) years. We also performed high-resolution-peripheral quantitative computed tomography (HRpQCT) imaging and report results at baseline, 5, 8, and 12 years of rhPTH(1-84) treatment. With prolonged use of rhPTH, reductions in the need for supplemental calcium and active vitamin D were maintained. The eGFR did not decline. Serum calcium was maintained within the lower limit of the normal range. aBMD by dual-energy X-ray absorptiometry (DXA) showed an increase at the lumbar spine and a decrease at the distal 1/3 radius. By HRpQCT, cortical volumetric BMD (vBMD) at the tibia decreased at year 5: -20.0% ± 1.5%. The magnitude of this reduction was mitigated in year 8: -8.5% ± 1.6% and in year 12: -10.3% ± 2.2% but all were significantly below the mean baseline value (p < 0.001). A similar pattern of decline was observed at the radius. Cortical porosity progressively increased at the tibia in year 5: 17.4% ± 10% (p < 0.05), year 8: 55.2% ± 11% (p < 0.001), and year 12: 83.5% ± 14% (p < 0.001). A similar pattern of increase was observed at the radius. Failure load, which was higher than normal at baseline, decreased but remained above normal at year 12. This is the longest experience, to date, with PTH therapy in HypoPT. These results demonstrate sustained biochemical stability but overall decreases in bone mass. © 2023 American Society for Bone and Mineral Research (ASBMR).

Sonographic evaluation of subclinical entheseal involvement in patients with hypoparathyroidism: a case control study.

PURPOSE: Hypoparathyroidism is a disease characterized by low serum calcium, increased serum phosphorus and low PTH levels. Although patients are treated with active vitamin D and calcium, a proper serum calcium phosphorus balance cannot always be achieved. Ectopic calcifications that develop in organs during treatment are the most common complications. To date, there is not any published study on enthesopathy in patients with hypoparathyroidism. The aim of this study was to evaluate subclinical enthesopathy in patients with hypoparathyroidism with ultrasound and to compare the results with those of the control group. METHODS: The study included patients aged 18-65 years with postoperative hypoparathyroidism and hypothyroidism (group hypoP + hypoT), patients with postoperative hypothyroidism (group hypoT), and healthy age and sex-matched volunteers (group C). Ultrasonographic findings of enthesopathy in both extremities were documented according to the Glasgow Ultrasound Enthesitis Scoring System (GUESS). RESULTS: GUESS scores in group hypoP + hypoT, were significantly higher when compared to the other groups. There was a statistically significant correlation between the total GUESS scores and total enthesophyte scores and the duration of hypoparathyroidism (p < 0.05, r = 0.43) (p < 0.05, r = 0.39) respectively. In the correlation analysis of all groups, a significant negative correlation was found between serum Ca and PTH levels and the total GUESS scores (p < 0.01, r = - 0.37; p < 0.01, r = - 0.54, respectively). CONCLUSION: This study showed that GUESS scores were significantly higher in patients with hypoparathyroidism compared to those with hypothyroidism and control subjects. GUESS scores were positively correlated with disease duration. Patients with hypoparathyroidism need to be evaluated for subclinical enthesopathy during follow-up.

Basal Ganglia Calcification Is Associated With Local and Systemic Metabolic Mechanisms in Adult Hypoparathyroidism.

CONTEXT: Hypoparathyroidism is characterized by low serum calcium, increased serum phosphorus, and inappropriately low or decreased serum parathyroid hormone, which may be associated with soft tissue calcification in the basal ganglia of the brain. OBJECTIVE: To assess the prevalence and factors involved in the pathophysiology of basal ganglia calcification (BGC) in the brain in chronic hypoparathyroidism and to evaluate proposed pathophysiologic mechanisms. DESIGN: Case-control study with retrospective review of medical records over 20 years. SETTING: Single academic medical center. PATIENTS: 142 patients with chronic hypoparathyroidism and computed tomography (CT) head scans followed between January 1, 2000 and July 9, 2020, and 426 age- and sex-matched controls with CT head scans over the same interval. INTERVENTIONS: None. MAIN OUTCOME MEASURES: Demographic, biochemical, and CT head imaging findings, with semiquantitative assessment of volumetric BGC. RESULTS: The study found that 25.4% of 142 patients followed for a median of 17 years after diagnosis of chronic hypoparathyroidism had BGC, which developed at a younger age than in controls. BGC was 5.1-fold more common in nonsurgical patients and less common in postsurgical patients. Low serum calcium and low calcium/phosphate ratio correlated with BGC. Neither serum phosphorus nor calcium × phosphate product predicted BGC. Lower serum calcium was associated with greater volume of BGC. The extent of BGC varied widely, with nonsurgical patients generally having a greater volume and distribution of calcification. CONCLUSIONS: BGC is associated with low serum calcium and low serum calcium/phosphate ratio, which may be related to severity of the disease, its etiology, or duration of treatment.

Indocyanine Green Fluorescence Angiography Can Guide Intraoperative Localization During Parathyroid Surgery.

BACKGROUND AND AIMS: Intraoperative localization of pathologic parathyroid glands is of major importance for the hyperparathyroidism treatment. Based on the small size and the anatomic variability, the localization can be very challenging. The current practice is to compare preoperative ultrasonography with Technetium-99m sestamibi scintigraphy (MIBI) and plan the resection accordingly. In this study, we implemented indocyanine green angiography for the intraoperative localization of parathyroid glands. MATERIALS AND METHODS: This is a retrospective analysis of 37 patients with primary, secondary, or tertiary hyperparathyroidism who were operated using indocyanine green angiography for the intraoperative localization of pathological parathyroid glands. An indocyanine green solution of 2.5 mg was were intravenously administered for parathyroid gland visualization. Different fluorescence scores were correlated with changes in postoperative parathyroid hormone levels. RESULTS: Patients were divided into two groups depending on the presence of uniglandular or multiglandular disease. Sixty-four lesions were resected, and the final histopathologic analysis confirmed the parathyroid origin in 62 of them (96.8%). None of the patients with uniglandular disease developed postoperative hypoparathyroidism, whereas three patients in the multiglandular group developed temporary hypoparathyroidism symptoms. Indocyanine green imaging had higher sensitivity for the intraoperative detection of parathyroid glands compared with ultrasonography and MIBI (p < 0.001). CONCLUSION: Indocyanine green angiography indicated high sensitivity for the intraoperative identification of pathologic parathyroid glands leading to a resection rate of 95.16%. The modality was useful, especially in cases of revisional surgery or ectopic parathyroid glands. Randomized trials have already proven the value of indocyanine green imaging in predicting postoperative hypocalcemia. Our results support the regular use of this method during parathyroid surgery.

Bone microstructure of adult patients with non-surgical hypoparathyroidism assessed by high-resolution peripheral quantitative computed tomography.

There is limited evidence regarding changes in bone microstructure in patients with hypoparathyroidism. In the current study, we used a non-invasive technique to assess bone structure in hypoparathyroidism patients and discovered site-specific changes which were mainly influenced by age and menstrual status. Such changes were more prominent in the trabeculae as well as in non-surgical as opposed to post-surgical patients. INTRODUCTION: Hypoparathyroidism (hypoPT) is a rare disease characterized by the lack of parathyroid hormone. There is limited evidence regarding changes in bone microstructure in patients with non-surgical hypoPT. We investigated bone microstructure of patients with non-surgical hypoPT using a non-invasive technique. METHODS: Patients with hypoPT were assessed using high-resolution peripheral quantitative computed tomography (HR-pQCT) and compared to age- and sex-matched healthy controls randomly selected from a pre-existing HR-pQCT database in a cross-sectional study. Preliminary comparison between patients with different etiologies of hypoPT was performed. Associations between bone microstructure and clinical parameters were investigated using correlation and regression analyses. RESULTS: A total of 94 patients with non-surgical hypoPT were recruited. Patients displayed an increase in trabecular volumetric BMD of the tibia (170.57 ± 34.32 vs. 156.48 ± 40.55 mg HA/cm3, p = 0.011) and increase in trabecular number of both the radius (1.48 ± 0.29 vs. 1.36 ± 0.22 mm-1, p = 0.003) and tibia (1.42 ± 0.23 vs. 1.24 ± 0.22 mm-1, p < 0.001) compared to healthy controls. Trabecular number was higher for non-surgical hypoPT compared to post-surgical hypoPT (1.37 ± 0.25 and 1.17 ± 0.13 mm-1, p = 0.022). Trends towards increase in cortical volumetric BMD were only present for post-menopausal female and male patients above the age of 50. For female patients, cortical volumetric BMD and area increased with age and decreased after menopause. For males, age had little influence on bone microstructure, but cortical porosity increased with longer treatment durations. CONCLUSIONS: Results from this pilot study suggested that both cortical and trabecular bone were altered in this group of patients with hypoPT. Etiology for hypoPT might influence bone microstructure, mainly on trabeculae. Age, menstrual status, and treatment duration were likely to influence bone microstructure in hypoPT.

Síndrome de Fahr secundario a hipoparatiroidismo: una causa infrecuente de movimientos anormales en niños / Fahr syndrome secondary to hypoparathyroidism: An infrequent cause of abnormal movements

Presentamos un caso de síndrome de Fahr en un escolar de 10 años masculino con movimientos distónicos cervicales y de miembros superiores en quien se sospechó que eran de origen convulsivo. En las imágenes cerebrales se evidenciaron hiperdensidades gangliobasales y subcorticales bilaterales, y las pruebas bioquímicas mostraron hipocalcemia e hiperfosfatemia con paratohormona baja. Recibió tratamiento anticonvulsivante, carbonato de calcio y calcitriol, con mejoría de los síntomas y sin recurrencia de movimientos anormales

We present a case of Fahr syndrome in a male 10-year-old schoolchild with dystonic cervical and upper limb movements which were suspected to be of convulsive origin. Brain images show bilateral basal and subcortical ganglia hyperdensities and biochemical tests show hypocalcemia and hyperphosphatemia with low paratohormone. He received anticonvulsant treatment, calcium carbonate and calcitriol with improvement of symptoms and without recurrence in abnormal movements

Changes in Skeletal Microstructure Through Four Continuous Years of rhPTH(1-84) Therapy in Hypoparathyroidism.

Bone remodeling is reduced in hypoparathyroidism, resulting in increased areal bone mineral density (BMD) by dual-energy X-ray absorptiometry (DXA) and abnormal skeletal indices by transiliac bone biopsy. We have now studied skeletal microstructure by high-resolution peripheral quantitative computed tomography (HR-pQCT) through 4 years of treatment with recombinant human PTH(1-84) (rhPTH[1-84]) in 33 patients with hypoparathyroidism (19 with postsurgical disease, 14 idiopathic). We calculated Z-scores for our cohort compared with previously published normative values. We report results at baseline and 1, 2, and 4 years of continuous therapy with rhPTH(1-84). The majority of patients (62%) took rhPTH(1-84) 100 µg every other day for the majority of the 4 years. At 48 months, areal bone density increased at the lumbar spine (+4.9% ± 0.9%) and femoral neck (+2.4% ± 0.9%), with declines at the total hip (-2.3% ± 0.8%) and ultradistal radius (-2.1% ± 0.7%) (p < .05 for all). By HR-pQCT, at the radius site, very similar to the ultradistal DXA site, total volumetric BMD declined from baseline but remained above normative values at 48 months (Z-score + 0.56). Cortical volumetric BMD was lower than normative controls at baseline at the radius and tibia (Z-scores -1.28 and - 1.69, respectively) and further declined at 48 months (-2.13 and - 2.56, respectively). Cortical porosity was higher than normative controls at baseline at the tibia (Z-score + 0.72) and increased through 48 months of therapy at both sites (Z-scores +1.80 and + 1.40, respectively). Failure load declined from baseline at both the radius and tibia, although remained higher than normative controls at 48 months (Z-scores +1.71 and + 1.17, respectively). This is the first report of noninvasive high-resolution imaging in a cohort of hypoparathyroid patients treated with any PTH therapy for this length of time. The results give insights into the effects of long-term rhPTH(1-84) in hypoparathyroidism. © 2020 American Society for Bone and Mineral Research.

Idiopathic Hypoparathyroidism With Papillary Thyroid Carcinoma in a Young Male: A Rare Case Report.

Background: Idiopathic hypoparathyroidism (IHP) is a rare disorder that is diagnosed by excluding other possible etiologies. Thyroid surgery causes approximately 14-60% of all cases of hypoparathyroidism; of these, surgery for papillary thyroid carcinoma (PTC) is the most common reason. Here, we report an extremely rare case of IHP combined with PTC. Case presentation: A 22-year-old man presented with a history of uncontrollable extremity and facial numbness, spasm and twitch lasting for nine years. He had been misdiagnosed with epilepsy and gained no relief from antiepileptic therapy. The laboratory evaluation revealed reduced parathyroid hormone and serum calcium and elevated inorganic phosphorus. After considering IHP, ultrasound detected a solid hypoechoic and irregularly shaped nodule 13×8×9 mm in size in the upper pole of the right thyroid gland, and fine-needle aspiration biopsy indicated PTC. Then, the patient underwent surgical treatment and radioactive iodine ablation. The long-term treatment strategy consisted of oral levothyroxine for thyroid-stimulating hormone inhibition and oral calcium and vitamin D supplements for hypocalcemia control. Conclusion: We report a rare case of IHP combined with PTC in a 22-year-old male. Some experiences and lessons from our treatment procedure merit discussion, and we hope that our report can serve as a reference for the diagnosis and treatment of similar patients in the future.

Intraoperative Indocyanine Green (ICG) Angiography for the Identification of the Parathyroid Glands: Current Evidence and Future Perspectives.

BACKGROUND/AIM: Recently, indocyanine green (ICG) fluorescence imaging has been used for the identification of the parathyroid glands (PG) during thyroid and parathyroid surgery. However, an overall consensus on the optimal technique, the dosage, the timing of the ICG administration and finally its interpretation and clinical usefulness is still lacking evidence. The aim of this review is to investigate the use of ICG angiography during thyroidectomy and/or parathyroidectomy for identification as well as for the perfusion integrity of the parathyroid glands. MATERIALS AND METHODS: The PubMed database was systematically searched for publications regarding intraoperative ICG imaging in patients that undergo thyroidectomy or parathyroidectomy. RESULTS: Eighteen publications reporting on 612 patients, namely 71 parathyroidectomy and 541 thyroidectomy patients met the inclusion criteria. Eleven publications reported the use of ICG angiography for the identification of the parathyroid glands during thyroidectomy and seven during parathyroidectomy for primary and secondary hyperparathyroidism. CONCLUSION: ICG fluorescence imaging is a simple, fast and reproducible method capable of intraoperatively visualizing and assessing the function of parathyroid glands, and can, therefore, assist surgeons in their decision-making. Despite all this, ICG fluorescence imaging technique for PG detection still lacks standardization and further studies are needed to establish its clinical utility.

Pulmonary alveolar proteinosis (PAP) in idiopathic hypoparathyroidism.

Idiopathic hypoparathyroidism (IH) and autoimmune pulmonary alveolar proteinosis (PAP) are rare disorders. A patient with IH and optimal calcaemic control on calcium and alfacalcidol was detected to have PAP after 8 years of follow-up. Patient had no respiratory complaints. Routine abdominal imaging for renal calcification showed patchy ground glass opacities in the lower lung fields leading to incidental diagnosis of PAP. Pulmonary function tests showed impaired diffusion capacity of the lung. Anti-granulocyte macrophage-colony stimulating factor autoantibodies were positive. Patient regularly attended the pulmonary clinic and showed progressive improvement in diffusion capacity of the lung during 2 years of follow-up. The calcaemic control in IH remained stable despite its presence with PAP. The autoimmune PAP in the presented case suggests a possible autoimmune basis of IH.

Predictors of Poor Bone Microarchitecture Assessed by Trabecular Bone Score in Postsurgical Hypoparathyroidism.

CONTEXT: The effects of PTH deprivation on bone are still unclear. Our objective was to report the characteristics of patients with postsurgical hypoparathyroidism (PsH) at a specialized outpatient service and correlate their trabecular bone score (TBS) values to clinical, densitometric, and laboratory findings. A secondary objective was to evaluate the fracture rates and look for associations between these events and the collected data. RESULTS: Eighty-two patients were enrolled, of whom 70 (85.4%) were female and 17 (20.7%) had type 2 diabetes mellitus (T2DM). The median body mass index (BMI) was 27.7 kg/m2 and the median age was 59 years. Of 68 dual-energy x-ray absorptiometry (DXA) scans obtained, osteopenia and osteoporosis were present in 32.4% and 2.9%, respectively. In all, 62 lumbar scans were analyzed by using TBS. The mean TBS value (±SD) was 1.386 ± 0.140, and 32.2% of the results were <1.310. TBS values correlated negatively with BMI (mainly > 30 kg/m2), age (mainly > 60 years), and glycemia, whereas abnormal TBS correlated with osteopenia, T2DM, low-impact fracture, and menopause. Six female patients had low-impact fractures, which were associated with a lower TBS (1.178 ± 0.065 vs. 1.404 ± 0.130 in the group without fractures; P < 0.001), older age, higher BMI, impaired renal function, abnormal glycemia, and osteopenia. CONCLUSION: The findings suggests that known risk factors for bone loss compromise the bone microarchitecture of individuals with PsH, regardless of DXA results. Menopausal women with PsH and older patients with PsH who have osteopenia, a higher BMI, or T2DM may be candidates for a more detailed assessment by using, for example, TBS.

Peripheral Nerve Anatomy Revisited: Modern Requirements for Neuroimaging and Microsurgery.

Detailed anatomic investigation of peripheral nerve topography underlies the correct application of intraoperative neuromonitoring (IONM) and ultrasonography, both well-established methods to prevent nerve palsy during surgical operations and to elucidate pathomechanisms in disease. In this study, we analyzed the anatomy of selected peripheral nerves in the head and neck regions to improve the outcome of endocrine and migraine surgeries. Anatomic dissections of 204 hemilarynges were performed to study the topography of the inferior laryngeal nerve (ILN). Measurements were taken from the lower rim of the cricoid and from the Zuckerkandl tubercle to the beginning of the furcation of the ILN. For the analysis of peripheral nerves contributing to migraine pathogenesis, 22 hemifaces were investigated by dissection and ultrasonography. The supratrochlear and supraorbital nerves and their relationship to the corrugator supercilii muscle are described. For identification of the ILN, the cricoid offers a suitable intraoperative landmark. A single branch existed in 5% of specimens on the left side and in 3% on the right side. Bifurcation was present in 72.5% and 62% and trifurcation in 18% and 29% of cases, respectively. IONM signals from the vagus nerve were positive if derived proximal to and negative if derived distal to the branching off of a nonrecurrent ILN (nrILN). By ultrasonographic identification of a brachiocephalic trunk, an nrILN could be excluded. For migraine surgery, possible compression points of the supratrochlear and supraorbital nerves were identified, and a workflow algorithm for ultrasound visualization of these nerves is provided. Anat Rec, 302:1325-1332, 2019. © 2019 Wiley Periodicals, Inc.

New Advances of ICG Angiography in Parathyroid Identification.

OBJECTIVE: For surgeons, locating parathyroid in thyroidectomy and parathyroidectomy is critical since parathyroid plays an important role in calcium balance. The fluorescence of parathyroid has already been found by researchers and the angiography equipment detecting the fluorescence of parathyroid with indocyanine green has been widely applied. Using the indocyanine green angiography and looking at the actual fluorescence of in vivo and in vitro tissues, it was possible to identify thyroid, parathyroid, lymph nodes and fat tissues during the surgical procedure. This mini-review aims to present the application of indocyanine green angiography in parathyroid detection and discusses the safety of this method. METHODS: The relevant data were searched by using the keywords "Indocyanine green," "Parathyroid," and "Identification" and "Protection" in "Pubmed," "Web of Science" and "China Knowledge Resource Integrated databases", and a manual search was done to acquire peer-reviewed articles and reports about indocyanine green. RESULTS: Indocyanine green dye along with the intraoperative fluorescence imaging system is safe in detecting parathyroid and predicting postoperative hypoparathyroidism. CONCLUSION: The conclusion suggests that indocyanine green angiography is a safe, effective and easy way to detect parathyroid glands. The conclusion will be of interest to surgeons regarding thyroidectomy and parathyroidectomy.

Research on indocyanine green angiography for predicting postoperative hypoparathyroidism.

BACKGROUND: It may be critical to locate the parathyroid for surgeons during thyroidectomy or parathyroidectomy due to the significant function of the parathyroid in calcium balance. According to recent reports, the intrinsic fluorescence of the parathyroid has been found. There is some evidence supporting that new equipment can detect fluorescence via imaging technology. In this study, a newly invented intraoperative fluorescence imaging system and indocyanine green dye were applied to detect the parathyroid glands and evaluate the vascularization of the parathyroid. The report is as follows. METHODS: From 1 May to 8 August 2018, 26 patients underwent total thyroidectomy in Zhuhai People's Hospital and were recruited into our research. All identified parathyroid glands were scored visually from grade 0 to grade 2 according to the vascularity of the parathyroid before ICG angiography was performed. After ICG angiography, parathyroid glands were scored from score 0 to score 2 according to the FI. RESULTS: Visual scores were significantly higher than ICG angiography scores. In the 22 patients with at least one parathyroid gland with an ICG score of 2, postoperative PTH levels were in the normal range. In the four patients with no parathyroid gland with an ICG score of 2, two of them developed transient hypoparathyroidism, with recovery on POD 7 for the first patient and after 3 months for the second one. CONCLUSION: This study has identified that the fluorescence imaging system applied with indocyanine green is a safe, easy and effective method to protect the parathyroid and predict postoperative hypoparathyroidism. Registration number: ChiCTR1800016864.