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Related Concept Videos

Diabetic Retinopathy01:27

Diabetic Retinopathy

DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...
Type I Diabetes III: Clinical Manifestations01:19

Type I Diabetes III: Clinical Manifestations

Type 1 diabetes mellitus typically presents with rapid-onset symptoms due to the body’s inability to utilize glucose in the absence of insulin. Since insulin is required for glucose uptake into cells, its deficiency leads to hyperglycemia and cellular energy deprivation, resulting in characteristic clinical features.Polyuria and PolydipsiaOne of the earliest, most prominent symptoms is polyuria (excessive urination). When blood glucose concentrations rise above the renal threshold, the kidneys...
Diabetes Insipidus I: Introduction01:29

Diabetes Insipidus I: Introduction

Definition Diabetes insipidus is a disorder marked by the production of large amounts of dilute urine because of impaired vasopressin production, release, or kidney response. The lack of effective vasopressin action limits water reabsorption in the renal collecting ducts, which leads to excessive urinary water loss and intense thirst.Clinical PresentationIndividuals with diabetes insipidus report persistent thirst and very high urine output. In severe cases, fluid intake can reach up to 20...
Diabetic Nephropathy01:28

Diabetic Nephropathy

Definition Diabetic nephropathy is a chronic kidney complication that results from prolonged hyperglycemia.Prevalence It is the most common cause of chronic kidney disease (CKD) and end-stage renal disease (ESRD) worldwide, affecting up to half of individuals with diabetes.Pathophysiology • Sustained hyperglycemia triggers multiple hemodynamic and metabolic changes in the kidney. • Early in the disease, increased renal blood flow and glomerular hyperfiltration occur due to afferent arteriolar...
Hyperglycemia01:29

Hyperglycemia

Hyperglycemia is an abnormally high blood glucose level. It is diagnosed by fasting glucose ≥126 mg/dL, 2-hour oral glucose tolerance test (or OGTT) ≥200 mg/dL, random glucose ≥200 mg/dL with symptoms, or HbA1c ≥6.5%. However, HbA1c results may be unreliable in certain conditions, such as anemia or hemoglobinopathies, and the diagnosis should be confirmed unless classic symptoms are present. Postprandial hyperglycemia is typically considered significant when glucose levels exceed 180 mg/dL two...
Diabetes Insipidus II: Pathophysiology01:22

Diabetes Insipidus II: Pathophysiology

Normally, water balance is maintained through three interconnected mechanisms: the hypothalamic thirst center, the synthesis and release of antidiuretic hormone (ADH, or vasopressin), and the kidneys' responsiveness to this hormone. ADH is synthesized in the hypothalamus, released from the posterior pituitary, and acts on the distal nephron, allowing water reabsorption and concentrated urine production.Diabetes Insipidus and Its TypesIn diabetes insipidus (DI), this regulatory system is...

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Related Experiment Video

Updated: Jul 17, 2026

Behavioral Assessment of Visual Function via Optomotor Response and Cognitive Function via Y-Maze in Diabetic Rats
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Smoking, polyuria and impaired vision.

A Granata1, G Viola, C Privitera

  • 1Department of Nephrology and Dialysis, Vittorio Emanuele Hospital, Italy. a.granata@mail.gte.it

Clinical Nephrology
|February 3, 2007
PubMed
Summary

Metastatic tumors to the pituitary gland are rare but can cause central diabetes insipidus. This case highlights the importance of considering pituitary metastasis in patients with cancer risk factors and sudden onset of this condition.

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Area of Science:

  • Endocrinology
  • Oncology
  • Neurology

Background:

  • Pituitary gland involvement in metastatic tumors is uncommon.
  • Metastases typically affect the posterior pituitary lobe, often presenting as diabetes insipidus.

Observation:

  • A 48-year-old male heavy smoker presented with sudden polyuria and thirst.
  • Laboratory tests confirmed central diabetes insipidus.
  • Brain CT revealed a sellar and suprasellar mass; chest CT showed a right superior lobe mass with mediastinal lymphadenopathy.

Findings:

  • Biopsy confirmed pulmonary adenocarcinoma.
  • The patient underwent radiotherapy and chemotherapy.
  • Tumor shrinkage correlated with reduced urinary output, indicating pituitary metastasis.

Implications:

  • Sudden diabetes insipidus in patients with cancer risk factors warrants consideration of pituitary metastasis.
  • Early diagnosis and treatment can manage symptoms and improve outcomes.
  • This case underscores the importance of a comprehensive differential diagnosis in endocrinological emergencies.