<prompt> Which part of oesophagus is mainly affected in scleroderma?Upper thirdMiddle thirdLower thirdAll the above  <response>: Ans. c Lower third. Ref. Harrison, Medicine, 18thCh. 292. Diseases of the EsophagusIn Scleroderma esophagus there is hypotensive LES and absent esophageal peristalsis, which predispose patients to severe GERD due to inadequate LES barrier function combined with poor esophageal clearance of refluxed acid.FEATURE OF FEW ESOPHAGEAL DISEASESAExaggerated Tertiary esophageal contractionsPresbyesophagus, diffuse esophageal spasm, neuromuscular diseases.Yo-Yo motion of barium.Corkscrew appearance scalloped configuration of barium column.Rosary-beadshish kebab configuration compartmentalization of barium column.Manometry is investigation of choice for mortality disorders .BFeline oesophagus transient contraction of longitudinally oriented muscularis mucosaeNormal variant.Gastroesophageal reflux disease.CDouble-barrel esophagusDissecting intramural hematoma.Mallory-Weiss tear.Intramural abscess.Intraluminal diverticulumDAchalasia cardia.Megaesophagussigmoid esophagus.Bird beak deformity.Absence of primary peristalsis below level of cricopharyngeus.Hurst phenomenon temporary transit through cardia when hydrostatic pressure of barium column is above toxic LES pressure.Vigorous achalasia numerous tertiary contractions in nondilated distal esophagus of early achalasiaECandidial esophagitisCobble stone mucosa.Shaggyfuzzy contour of the esophagusFCytomegalovirus esophagitis.Giant ovoid flat ulcers.GHerpes esophagitisDiscrete superficial punctate linear serpentine stellate diamond shaped ulcersHHiatus herniaEpiphrenic bulge.Four longitudinal coarse thick gastric folds above gastroesophageal junction or in the suprahiatal pouch.Distance between B ring hiatal margin 2 cm.Peristalsis causes above hiatus.JSclerodermaLower third esophagus mostly affected.Esophageal shortening.Sliding hiatus hernia.Hidebound esophagus.KCarcinoma oesophagusRat-tail esophagus.Shouldering sign.LCorrosive poisoning Lye strictureTightLongSmooth stricture 