Related Experiment Video
Updated: May 23, 2026
10:10
Robotic Duodenum-preserving Total Pancreatic Head Resection for Intraductal Papillary Mucinous Neoplasms
Published on: April 17, 2026
Pseudomelanosis duodeni associated with chronic renal failure
Marcia Henriques de Magalhães Costa1, Maria da Gloria Fernandes Pegado, Cleber Vargas
1Gastroenterology Section, Department of Internal Medicine, Clementino Fraga Filho University Hospital, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-913, Brazil.
World Journal of Gastroenterology
|April 12, 2012
Summary
Pseudomelanosis duodeni (PD) is a rare duodenal condition linked to chronic kidney disease and gastrointestinal bleeding. Further research is needed to define its exact causes and clinical importance.
Area of Science:
- Gastroenterology
- Nephrology
- Pathology
Background:
- Pseudomelanosis duodeni (PD) is a rare condition characterized by dark, speckled duodenal mucosa.
- It is often associated with gastrointestinal bleeding, hypertension, heart failure, and chronic renal failure.
- The pathogenesis and clinical significance of PD remain incompletely understood.
Observation:
- This report details four cases of PD in patients with chronic renal failure presenting with epigastric pain, nausea, melena, and anemia.
- Endoscopic examination revealed esophageal and gastric erosions, alongside characteristic melanosis of the duodenal mucosa.
- Histopathological studies confirmed the presence of melanosis.
Findings:
- The study highlights a correlation between pseudomelanosis duodeni and chronic renal failure.
- Endoscopic and histopathological findings confirmed the diagnosis in all four cases.
- Associated symptoms included gastrointestinal bleeding and anemia.
Implications:
- Pseudomelanosis duodeni, while often considered benign, may present with significant gastrointestinal symptoms in patients with chronic renal failure.
- This case series underscores the importance of considering PD in the differential diagnosis of unexplained gastrointestinal bleeding in renal failure patients.
- Further investigation into the pathogenesis and clinical implications of PD is warranted.
Related Concept Videos
01:28Diabetic 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...
01:24Chronic Kidney Disease II: Clinical Manifestations
Chronic Kidney Disease (CKD) progressively impairs multiple body systems due to the accumulation of uremic toxins, which disrupt cellular functions across various organs.Neurologic symptomsNeurologic symptoms often arise early in CKD, as uremic toxin buildup drives changes in cognitive and motor functions. Patients frequently experience fatigue, headache, confusion, difficulty concentrating, and, in severe cases, seizures. Peripheral neuropathy commonly manifests as burning sensations in the...
01:24Nephrotic Syndrome I : Introduction
Nephrotic Syndrome is a chronic kidney disorder defined by clinical findings such as severe proteinuria, hypoalbuminemia, hyperlipidemia, and edema. These symptoms result from damage to the glomeruli, the kidney’s filtering units, increasing their permeability to proteins.Definition and Meaning:Proteinuria, defined as the loss of more than 3.5 grams of protein per day in adults, is a crucial feature of nephrotic syndrome. This condition is often accompanied by edema, the accumulation of fluid...
01:10Nephrons
The kidneys are intricate organs with millions of working units known as nephrons. Each nephron features two major structures: the renal corpuscle, which facilitates blood plasma filtration, and the renal tubule, which handles the glomerular filtrate. Blood supply is directly linked to the nephrons. The renal corpuscle consists of the glomerulus, a capillary network, and the Bowman's capsule, a double-walled epithelial structure that encases the glomerulus. The filtering of blood plasma happens...
01:25Chronic Kidney Disease I: Introduction
Chronic Kidney Disease (CKD) arises when the kidneys progressively lose their ability to function, ultimately leading to end-stage renal disease. At this advanced stage, the kidneys can no longer filter waste or maintain essential body functions, requiring renal replacement therapy (RRT) through dialysis or a kidney transplant for survival.Early-stage chronic kidney disease and detection challengesIn CKD's early stages, symptoms often remain absent because healthy nephrons compensate for...
01:25Peptic Ulcer Disease III: Clinical Manifestations and Complications
Duodenal UlcersDuodenal ulcers are the most common form of peptic ulcer disease, presenting with chronic, intermittent epigastric pain. Pain typically appears 2–3 hours after meals, especially when the stomach is empty, often waking patients at night. It is characteristically relieved by food or antacids (“pain–food–relief”). Some patients remain asymptomatic until complications like bleeding or perforation emerge, particularly with NSAID or anticoagulant use.Gastric UlcersGastric ulcers share...