Heterotopic gastric mucosa in the gallbladder—a rare find
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It is universally known and accepted that the development of a certain type of tissue outside its usual location, like in the gastrointestinal tract, can occur. This is a relatively common situation in the upper region of the gastrointestinal tract. However, the development of gastric mucosa in the gallbladder is a rare find.

A 22-year-old male with smoking habits was periodically followed in internal medicine consultations for epigastric abdominal pain, in which, through endoscopic examinations, a Helicobacter pylori-positive test was identified. Once the eradication of H. pylori was completed and confirmed, the patient started experiencing symptoms of recurrent pain in the right hypochondrium. His blood tests were normal. An abdominal ultrasound was performed, which revealed a nodular image adhering to the internal wall (not moving with positional changes) with 18 mm, found in the infundibular region. It was echogenic with an anechoic center. These aspects were compatible with sessile polyp with a necrotic center associated with surrounding parietal thickening.

In order to obtain further clarification, endoscopic ultrasonography was carried out, which confirmed a homogeneous echogenic lesion with central hypoechogenicity with a larger transversal diameter of 18 mm adhering to the wall. In this context, the patient was proposed for elective laparoscopic cholecystectomy, which occurred without complications. After surgery, microscopy revealed a cavitated polyp consisting largely of gastric body mucosa, although pyloric type mucosa was still found, with no intestinal metaplasia or epithelial dysplasia being identified.