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Related Concept Videos

Chronic Pancreatitis I: Introduction01:24

Chronic Pancreatitis I: Introduction

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The pancreas, an elongated and flat gland situated behind the stomach, serves a vital function in digesting food and managing blood sugar levels.
Pancreatitis is the inflammation of the pancreas, which occurs when the immune system becomes active and causes swelling, pain, and disruptions in organ function. Pancreatitis can manifest as either an acute or chronic condition.
Acute pancreatitis arises suddenly and lasts for a brief duration, while chronic pancreatitis is a long-term affliction...
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Glucose Homeostasis: Pancreatic Islets and Insulin Secretion01:27

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The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
Insulin and C-peptide are...
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Diabetes mellitus is a chronic metabolic disorder characterized by hyperglycemia. The four categories of diabetes are type 1 diabetes, type 2 diabetes, other specific types of diabetes, and gestational diabetes.
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Acute Pancreatitis II: Clinical Manifestations and Management01:30

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Acute pancreatitis presents a complex medical emergency characterized by rapid onset inflammation of the pancreas, demanding timely diagnosis and management to prevent complications. The condition primarily manifests through severe upper abdominal pain that often radiates to the back. This pain intensifies following the consumption of fatty foods. Accompanying symptoms such as nausea, vomiting, abdominal distention, fever, dyspnea, cyanosis, and jaundice can vary in intensity but significantly...
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Diabetes Mellitus: Overview and Type I Subtype01:22

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Diabetes mellitus is a chronic metabolic disorder characterized by high blood glucose levels due to inadequate insulin production, insulin resistance, or both. The condition affects millions worldwide and can significantly impact their health and quality of life.
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Insulin: Biosynthesis, Chemistry, and Preparation01:25

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The endoplasmic reticulum (ER) of pancreatic β-cells synthesizes preproinsulin, which consists of a signal peptide, A and B chains, and a C-peptide. Preproinsulin is then cleaved and folded into proinsulin, which translocates to the Golgi apparatus for sorting and packaging into secretory granules. In these granules, enzymatic clipping generates insulin and C-peptide.
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Related Experiment Video

Updated: Jul 27, 2025

Robotic Enucleation of an Intra-Pancreatic Insulinoma in the Pancreatic Head
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Pancreatic Dysfunction Masquerading as an Insulinoma.

Siddharth Shah1, Christian Scott1, ShahZeib Syed1

  • 1Internal Medicine, LewisGale Medical Center, Salem, USA.

Cureus
|June 9, 2023
PubMed
Summary

Insulinoma, a rare tumor causing low blood sugar, can be misdiagnosed. This case highlights the importance of accurate diagnostic algorithms to prevent incorrect insulinoma diagnosis, even with typical symptoms.

Keywords:
case-reportclinical case reportpancreatic insufficiencypancreatic insulinomapancreatic neuroendocrine tumors

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Area of Science:

  • Endocrinology
  • Oncology
  • Internal Medicine

Background:

  • Insulinoma is a rare neuroendocrine tumor causing hyperinsulinism and hypoglycemia.
  • Diagnosis typically involves elevated C-peptide levels and exclusion of sulfonylurea use.
  • Standard treatment includes glucose administration and potentially surgical resection for large tumors.

Observation:

  • A young man presented with a year-long history of recurrent hypoglycemic symptoms.
  • Symptoms resolved with the intake of high-glucose foods and beverages.
  • A 72-hour fasting test, a key diagnostic tool, did not confirm insulinoma.

Findings:

  • Despite classic symptoms suggestive of insulinoma, the fasting test yielded negative results.
  • This discrepancy underscores potential challenges in diagnosing insulinoma.
  • Accurate diagnostic pathway adherence is crucial for correct patient management.

Implications:

  • This case emphasizes the need for careful evaluation and adherence to diagnostic protocols for suspected insulinoma.
  • Misdiagnosis can lead to delayed or incorrect treatment.
  • Understanding diagnostic limitations is vital for effective patient care in endocrinology.