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Junith Thomas Department of Transfusion Medicine, Jubilee Mission Medical College, Thrissur, Kerala, India

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Rohini Sebastian Department of Pathology, Jubilee Mission Medical College, Thrissur, Kerala, India

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C R Anil Kumar Department of General Medicine, Jubilee Mission Medical College, Thrissur, Kerala, India

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Aboobacker Mohamed Rafi Department of Transfusion Medicine, Jubilee Mission Medical College, Thrissur, Kerala, India

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Summary

Although most published cases of lead poisoning come from occupational exposures, some traditional remedies may also contain toxic amounts of lead. Here, we report the case of a 58-year-old female who presented with abdominal pain, generalized tiredness, and decreased food intake, with anemia and elevated levels of lead. The patient was found to be taking herbal capsules for diabetes prior to the presentation. This case highlights the need for increased awareness that some herbal remedies may contain potentially harmful levels of heavy metals, and people who use them are at risk of developing associated toxicities.

Learning points

  • Individuals who support traditional medicine often incorrectly believe that herbal remedies for diabetes are free from side effects, leading them to favor these treatments over contemporary medications.

  • Herbal medications are freely available online, even without a prescription.

  • The accessibility of herbal medicines without prescriptions, coupled with the false belief in their lack of side effects, misleads educated individuals toward quackery treatments. Misinformation spread via social media exacerbates this issue.

  • Heavy metals are present in toxic levels in the drugs, causing complications.

  • Lead is the most common heavy metal found in such herbal medicines.

  • Lead poisoning leads to anemia and other systemic complications which could have been fatal if not found in time.

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Presoon Kuruvilla Department of Internal Medicine, Caritas Hospital, Kerala, India

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Angel John Department of Internal Medicine, Caritas Hospital, Kerala, India

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Ashith Murali Department of Internal Medicine, Caritas Hospital, Kerala, India

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Summary

Insulin autoantibody syndrome (IAS) or Hirata’s disease is a rare condition characterized by recurrent fasting hypoglycaemic and postprandial hyperglycaemic episodes. Insulin autoantibodies are diagnostic for the condition. Hirata’s disease has been seen to be associated with other autoimmune conditions. Vitiligo is a common depigmentation disorder whose exact cause is unknown but thought to have an autoimmune aetiology. Although autoimmunity plays a role in the pathogenesis of both the diseases, association between the two has not been reported till date. In our case, a 72-year-old Indian woman with vitiligo for the past 30 years presented with recurrent episodes of fasting hypoglycaemia. She was found to have very high levels of fasting insulin, C-peptide, and insulin antibody and was diagnosed with IAS. Thus, we conclude that the clinical spectrum of Hirata’s disease has to be taken as more heterogenous than previously assumed.

Learning points

  • Insulin autoantibody syndrome (IAS) or Hirata’s disease is a rare condition characterized by recurrent fasting hypoglycaemic and postprandial hyperglycaemic episodes in which insulin plays a major role.

  • Insulin autoantibodies are diagnostic for IAS. The endocrine insulin and its autoantibodies play a major role in the pathogenesis of the disease.

  • Vitiligo is a common depigmentation disorder whose exact cause is unknown but thought to have an autoimmune aetiology.

  • IAS and vitiligo are two diseases with autoimmune aetiology which has been seen to be associated with each other (the first case to be reported).

  • The clinical spectrum of Hirata’s disease has to be taken as more heterogenous than previously assumed.

  • On dealing with autoimmune diseases, we should also keep in mind about other diseases with autoimmune pathogenesis.

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Jenny S W Yun Department of Surgical Oncology, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia

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Chris McCormack Department of Surgical Oncology, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia

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Michelle Goh Department of Surgical Oncology, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia

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Cherie Chiang Department of Internal Medicine, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia
University of Melbourne, Parkville, Victoria, Australia

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Summary

Acanthosis nigricans (AN) is a common dermatosis associated with hyperinsulinemia and insulin resistance. However, AN has been rarely reported in patients with insulinoma, a state of persistent hyperinsulinemia. We present a case of metastatic insulinoma, in whom AN manifested after the first cycle of peptide receptor radionuclide therapy (PRRT). A 40-year-old man was diagnosed with metastatic insulinoma after 5 months of symptomatic hypoglycemia. Within 1 month post PRRT, the patient became euglycemic but developed a pigmented, pruritic rash which was confirmed on biopsy as AN. We discuss the rare manifestation of AN in subjects with insulinoma, the role of insulin in the pathogenesis of AN, malignant AN in non-insulin-secreting malignancies and association with other insulin-resistant endocrinopathies such as acromegaly.

Learning points

  • Acanthosis nigricans (AN) is a common dermatosis which is typically asymptomatic and associated with the hyperinsulinemic state.

  • Malignant AN can rapidly spread, cause pruritus and affect mucosa and the oral cavity.

  • AN is extremely rare in patients with insulinoma despite marked hyperinsulinemia.

  • Peptide receptor radionuclide therapy might have triggered TGF-α secretion in this subject which led to malignant AN.

  • Rapid spread or unusual distribution of pruritic AN warrants further investigation to exclude underlying malignancy.

Open access
Pranav Gupta Division of Endocrinology, Department of Pediatrics, Children’s Healthcare of Atlanta, Emory University School of Medicine, Atlanta, Georgia, USA

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Karen Loechner Division of Endocrinology, Department of Pediatrics, Children’s Healthcare of Atlanta, Emory University School of Medicine, Atlanta, Georgia, USA
Division of Endocrinology, Department of Pediatrics, Connecticut Childrens Medical Center, Farmington, Connecticut, USA

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Briana C Patterson Division of Endocrinology, Department of Pediatrics, Children’s Healthcare of Atlanta, Emory University School of Medicine, Atlanta, Georgia, USA
Aflac Cancer and Blood Disorders Center of Children’s Healthcare of Atlanta, Atlanta, Georgia, USA

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Eric Felner Division of Endocrinology, Department of Pediatrics, Children’s Healthcare of Atlanta, Emory University School of Medicine, Atlanta, Georgia, USA

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Summary

Insulinomas are a rare cause of persistent hypoglycemia in a previously healthy child. In addition to symptoms of hypoglycemia, individuals with insulinomas usually present with a history of incessant caloric intake and weight gain due to a constant need to counter hypoglycemia. In addition to an extensive review of the literature, we report the first case of an insulinoma coexisting with reduced appetite secondary to anorexia nervosa in an adolescent female.

Learning points

  • Eliciting a detailed family history is important in hypoglycemia cases.

  • Obtaining a thorough dietary intake, weight history, and menstrual cycles (in females) and considering a psychiatric consultation for an eating disorder when indicated.

  • Although rare in the pediatric population, multiple endocrine neoplasia type 1 syndrome should be considered in the evaluation of children and adolescents with hypoglycemia who also have a family history of pituitary, pancreatic, and/or parathyroid endocrinopathies.

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Daphne Yau Departments of Paediatric Endocrinology, Royal Manchester Children’s Hospital, Manchester, UK

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Maria Salomon-Estebanez Departments of Paediatric Endocrinology, Royal Manchester Children’s Hospital, Manchester, UK

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Amish Chinoy Departments of Paediatric Endocrinology, Royal Manchester Children’s Hospital, Manchester, UK

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John Grainger Departments of Paediatric Haematology, Royal Manchester Children’s Hospital, Manchester, UK

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Ross J Craigie Departments of Paediatric Surgery, Royal Manchester Children’s Hospital, Manchester, UK

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Raja Padidela Departments of Paediatric Endocrinology, Royal Manchester Children’s Hospital, Manchester, UK

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Mars Skae Departments of Paediatric Endocrinology, Royal Manchester Children’s Hospital, Manchester, UK

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Mark J Dunne Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK

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Philip G Murray Departments of Paediatric Endocrinology, Royal Manchester Children’s Hospital, Manchester, UK

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Indraneel Banerjee Departments of Paediatric Endocrinology, Royal Manchester Children’s Hospital, Manchester, UK

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Summary

Congenital hyperinsulinism (CHI) is an important cause of severe hypoglycaemia in infancy. To correct hypoglycaemia, high concentrations of dextrose are often required through a central venous catheter (CVC) with consequent risk of thrombosis. We describe a series of six cases of CHI due to varying aetiologies from our centre requiring CVC for the management of hypoglycaemia, who developed thrombosis in association with CVC. We subsequently analysed the incidence and risk factors for CVC-associated thrombosis, as well as the outcomes of enoxaparin prophylaxis. The six cases occurred over a 3-year period; we identified an additional 27 patients with CHI who required CVC insertion during this period (n = 33 total), and a separate cohort of patients with CHI and CVC who received enoxaparin prophylaxis (n = 7). The incidence of CVC-associated thrombosis was 18% (6/33) over the 3 years, a rate of 4.2 thromboses/1000 CVC days. There was no difference in the frequency of genetic mutations or focal CHI in those that developed thromboses. However, compound heterozygous/homozygous potassium ATP channel mutations correlated with thrombosis (R 2 = 0.40, P = 0.001). No difference was observed in CVC duration, high concentration dextrose or glucagon infused through the CVC. In patients receiving enoxaparin prophylaxis, none developed thrombosis or bleeding complications. The characteristics of these patients did not differ significantly from those with thrombosis not on prophylaxis. We therefore conclude that CVC-associated thrombosis can occur in a significant proportion (18%) of patients with CHI, particularly in severe CHI, for which anticoagulant prophylaxis may be indicated.

Learning points:

  • CVC insertion is one of the most significant risk factors for thrombosis in the paediatric population.

  • Risk factors for CVC-associated thrombosis include increased duration of CVC placement, malpositioning and infusion of blood products.

  • To our knowledge, this is the first study to evaluate CVC-associated thrombosis in patients with congenital hyperinsulinism (CHI).

  • The incidence of CVC-associated thrombosis development is significant (18%) in CHI patients and higher compared to other neonates with CVC. CHI severity may be a risk factor for thrombosis development.

  • Although effective prophylaxis for CVC-associated thrombosis in infancy is yet to be established, our preliminary experience suggests the safety and efficacy of enoxoaparin prophylaxis in this population and requires on-going evaluation.

Open access
Sarah Kiff Department of Paediatric Endocrinology, Great Ormond Street Hospital for Children, London, UK
Department of Endocrinology, Royal Hospital for Sick Children, Edinburgh, UK

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Carolyn Babb Department of Paediatric Endocrinology, Great Ormond Street Hospital for Children, London, UK

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Maria Guemes Department of Paediatric Endocrinology, Great Ormond Street Hospital for Children, London, UK
Genetics and Genomic Medicine Programme, Great Institute of Child Health, University College London, London, UK

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Antonia Dastamani Department of Paediatric Endocrinology, Great Ormond Street Hospital for Children, London, UK

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Clare Gilbert Department of Paediatric Endocrinology, Great Ormond Street Hospital for Children, London, UK

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Sarah E Flanagan Institute of Biomedical and Clinical Science, University of Exeter Medical School, Exeter, UK

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Sian Ellard Institute of Biomedical and Clinical Science, University of Exeter Medical School, Exeter, UK

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John Barton Department of Paediatric Endocrinology, Bristol Royal Hospital for Children, Bristol, UK

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M Dattani Department of Paediatric Endocrinology, Great Ormond Street Hospital for Children, London, UK
Genetics and Genomic Medicine Programme, Great Institute of Child Health, University College London, London, UK

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Pratik Shah Department of Paediatric Endocrinology, Great Ormond Street Hospital for Children, London, UK
Genetics and Genomic Medicine Programme, Great Institute of Child Health, University College London, London, UK

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Summary

We report a case of partial diazoxide responsiveness in a child with severe congenital hyperinsulinaemic hypoglycaemia (CHI) due to a homozygous ABCC8 mutation. A term baby, with birth weight 3.8 kg, born to consanguineous parents presented on day 1 of life with hypoglycaemia. Hypoglycaemia screen confirmed CHI. Diazoxide was commenced on day 7 due to ongoing elevated glucose requirements (15 mg/kg/min), but despite escalation to a maximum dose (15 mg/kg/day), intravenous (i.v.) glucose requirement remained high (13 mg/kg/min). Genetic testing demonstrated a homozygous ABCC8 splicing mutation (c.2041-1G>C), consistent with a diffuse form of CHI. Diazoxide treatment was therefore stopped and subcutaneous (s.c.) octreotide infusion commenced. Despite this, s.c. glucagon and i.v. glucose were required to prevent hypoglycaemia. A trial of sirolimus and near-total pancreatectomy were considered, however due to the significant morbidity potentially associated with these, a further trial of diazoxide was commenced at 1.5 months of age. At a dose of 10 mg/kg/day of diazoxide and 40 µg/kg/day of octreotide, both i.v. glucose and s.c. glucagon were stopped as normoglycaemia was achieved. CHI due to homozygous ABCC8 mutation poses management difficulties if the somatostatin analogue octreotide is insufficient to prevent hypoglycaemia. Diazoxide unresponsiveness is often thought to be a hallmark of recessively inherited ABCC8 mutations. This patient was initially thought to be non-responsive, but this case highlights that a further trial of diazoxide is warranted, where other available treatments are associated with significant risk of morbidity.

Learning points:

  • Homozygous ABCC8 mutations are commonly thought to cause diazoxide non-responsive hyperinsulinaemic hypoglycaemia.

  • This case highlights that partial diazoxide responsiveness in homozygous ABCC8 mutations may be present.

  • Trial of diazoxide treatment in combination with octreotide is warranted prior to considering alternative treatments, such as sirolimus or near-total pancreatectomy, which are associated with more significant side effects.

Open access
Nishant Raizada Department of Endocrinology and Metabolism, All India Institute of Medical Sciences, New Delhi, India

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S H Rahaman Department of Endocrinology and Metabolism, All India Institute of Medical Sciences, New Delhi, India

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D Kandasamy Department of Radiology, All India Institute of Medical Sciences, New Delhi, India

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V P Jyotsna Department of Endocrinology and Metabolism, All India Institute of Medical Sciences, New Delhi, India

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Summary

Insulin autoimmune syndrome (IAS) is a rare cause of hyperinsulinemic hypoglycaemia, which is known to occur in association with the use of sulfhydryl-containing drugs and autoimmune disorders. We describe a patient with hitherto an unreported association of IAS with ankylosing spondylitis. We have also performed and described a simplified method of polyethylene glycol (PEG) precipitation of an insulin bound antibody in the serum.

Learning points

  • IAS should be considered in differential diagnosis of endogenous hyperinsulinemic hypoglycaemia.

  • Ankylosing spondylitis can be associated with IAS apart from several other autoimmune diseases.

  • Very high serum insulin levels (100–10 000 μU/ml) are frequently seen in IAS.

  • When faced with very high serum insulin before suspecting insulinoma, it is advisable that PEG precipitation of serum be done to identify antibody bound insulin.

  • A clinical suspicion of IAS can avoid expensive imaging and unnecessary surgery in affected patients.

Open access
Soham Mukherjee Department of Endocrinology, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012, India

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Anuradha Aggarwal Department of Endocrinology, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012, India

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Ashu Rastogi Department of Endocrinology, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012, India

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Anil Bhansali Department of Endocrinology, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012, India

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Mahesh Prakash Department of Radiology, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012, India

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Kim Vaiphei Department of Histopathology, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012, India

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Pinaki Dutta Department of Endocrinology, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012, India

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Summary

Spontaneous diabetic muscle infarction (DMI) is a rare and under diagnosed complication of diabetes mellitus. Clinically it presents with acute to subacute onset swelling, pain and tenderness of muscle(s) without systemic manifestations. MRI is helpful in diagnosis, exclusion of other causes and for localization of affected muscle for biopsy in atypical cases. Muscles of the thighs are commonly affected in diabetic myonecrosis (DMN). Here we present the summary of four cases seen in the last 3 years in a tertiary care centre with simultaneous or sequential involvement of multiple groups of muscles or involvement of uncommon sites. All these patients had advanced duration of diabetes with microvascular complications and poor glycemic control. Conservative management including rest and analgesics is the treatment of choice. Short-term prognosis is good but there may be recurrence.

Learning points

  • A high index of suspicion is required for the diagnosis of DMN which can avoid inadvertent use of antibiotics.

  • Acute–subacute onset severe focal muscle pain in the absence of systemic symptoms in a female patient with long-standing diabetes with microvascular complications suggests DMI.

  • MRI is the most sensitive test for diagnosis.

  • Muscle biopsy should be reserved for atypical cases.

  • Conservative management including rest and analgesics has good outcome.

  • Improvement usually occurs within 6–8 weeks, but there may be recurrence.

Open access
Pinaki Dutta Departments of Endocrinology, Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India

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Anuradha Aggarwal Departments of Endocrinology, Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India

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Yashpal Gogate Departments of Endocrinology, Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India

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Uma Nahar Histopathology, Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India

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Viral N Shah Departments of Endocrinology, Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India

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Mandeep Singla Departments of Endocrinology, Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India

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N Khandelwal Radiodiagnosis, Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India

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Anil Bhansali Departments of Endocrinology, Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India

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Summary

We describe the clinical presentation, diagnostic and management issues in five cases of non-islet cell tumor hypoglycemia (NICTH), diagnosed at a tertiary care institute over a period of 15 years. The clinical, laboratory, and histopathological findings of these patients along with diagnostic utility of IGF2:IGF1 ratio are discussed. The mean age of presentation was 52 years, with a male predominance (3:2). Three patients presented with recurrent episodes of fasting hypoglycemia and it was detected in other two patients during hospitalization. Two patients had acromegaloid features that regressed following treatment. One patient had hypokalemia. Low levels of insulin, C-peptide, GH, and IGF1 were invariably found in all. The IGF2 level was elevated in only one patient; however, IGF2:IGF1 ratio was more than 10 in four of the five patients. The mean tumor size was 16.4 cm and mean weight was 3.6 kg. Four patients had mesenchymal tumors and one had epithelial tumor. NICTH is a rare cause of hypoglycemia. Hypoinsulinemic hypoglycemia with low IGF1 and IGF2:IGF1 ratio more than 10 is suggestive of this entity.

Learning points

  • NICTH should be considered in patients presenting with tumor of mesenchymal origin and hypoglycemia.

  • Hypoinsulinemic hypoglycemia with low IGF1 is a strong biochemical evidence of NICTH.

  • IGF2:IGF1 ratio of more than 10 is a complementary investigation in the absence of an assay facility for IGF2.

Open access