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What is Plummer–Vinson syndrome and explain in detail?
Plummer–Vinson syndrome is a rare disease characterized by difficulty swallowing, iron-deficiency anemia, glossitis, cheilosis and esophageal webs. Treatment with iron supplementation and mechanical widening of the esophagus generally provides an excellent outcome.
While exact data about the epidemiology is unknown, this syndrome has become extremely rare. The reduction in the prevalence of Plummer–Vinson syndrome has been hypothesized to be the result of improvements in nutritional status and availability in countries where the syndrome was previously described. It generally occurs in perimenopausal women. Its identification and follow-up is considered relevant due to increased risk of squamous cell carcinomas of the esophagus and pharynx.

Presentation
Patients with Plummer–Vinson syndrome often have a burning sensation with the tongue and oral mucosa, and atrophy of lingual papillae produces a smooth, shiny, red, dorsum of the tongue. Symptoms include:
Dysphagia (difficulty swallowing)
Pain
Weakness
Odynophagia (painful swallowing)
Atrophic glossitis
Angular cheilitis
Koilonychia (Abnormally thin nails, also called spoon nails)
Splenomegaly (an enlarged spleen).
Upper esophageal webs (post cricoid region -  contrasts with Schatzki rings found at the lower end of esophagus).Serial contrasted gastrointestinal radiography or upper-gastrointestinal endoscopy may reveal the web in the esophagus. Blood tests demonstrate a hypochromic microcytic anemia that is consistent with an iron-deficiency anemia. Biopsy of involved mucosa typically reveals epithelial atrophy (shrinking) and varying amounts of submucosal chronic inflammation. Epithelial atypia or dysplasia may be present. It may also present as a post-cricoid malignancy which can be detected by loss of laryngeal crepitus. Laryngeal crepitus is found normally and is produced because the cricoid cartilage rubs against the vertebrae.

Causes
The cause of Plummer–Vinson syndrome is unknown; however, genetic factors and nutritional deficiencies may play a role. It is more common in women, particularly in middle age, with a peak age over 50 years.

Diagnosis
The following clinical presentations may be used in the diagnosis of this condition.
Dizziness
Pallor of the conjunctiva and face
Erythematous oral mucosa with burning sensation
Breathlessness
Atrophic and smooth tongue
Peripheral rhagades around the oral cavityThe following tests are helpful in the diagnosis of Plummer–Vinson syndrome.

Lab tests
Complete blood cell counts, peripheral blood smears, and iron studies (e.g., serum iron, total iron-binding capacity, ferritin, and saturation percentage) to confirm iron deficiency, either with or without hypochromic microcytic anemia.

Imaging
Barium esophagography and videofluoroscopy will help to detect esophageal webs. Esophagogastroduodenoscopy will enable visual confirmation of esophageal webs. The webs occur due to sub-epithelial fibrosis.
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Prevention
Good nutrition with adequate intake of iron may prevent this disorder. Good nutrition should also include balanced diet and exercise.

Treatment
Treatment is primarily aimed at correcting the iron-deficiency anemia. Patients with Plummer–Vinson syndrome should receive iron supplementation in their diet