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Embryology and Anatomy of the Anus and Anal Canal The anal canal forms during the fourth to seventh weeks of gestation after partitioning of the cloaca into the ventral urogenital membrane and dorsal membrane. The epithelium of the superior two-thirds…
Esophagus Gastroesophageal reflux esophagitis DDX: eosinophilic esophagitis, lymphocytic esophagitis, lichen planus, squamous dysplasia Clinical features Gastroesophageal reflux disease (GERD) is very common in Western countries, with a prevalence rate among adults in the United States estimated to be 20% to…