Cachexia and Invisible Stomach on Endoscopy: An Endoscopist's Enigma and a Surgeon's Axiom.

Gastroduodenal intussusception (GDI) is a very rare clinical entity in adults. GDI can present acutely or chronically in adults with varying spectrum of symptoms and signs. GDI can present acutely with abdominal pain, vomiting and palpable mass. In rare instances it can lead to anemia and cachexia. Computed tomography (CT) of the abdomen can demonstrate GDI in majority of cases. However, endoscopy findings could lead to identifying etiological factor and tissue diagnosis. In majority of the cases endoscopy may show mucosal or submucosal lesion leading to GDI. We bring forward a case of GDI wherein patient presented with cachexia, intermittent vomiting along with anemia. Further workup including imaging has resulted in the rare diagnosis of GDI. Interestingly we encountered a rare of its kind, endoscopic presentation where there was total absence of stomach due to its complete invagination through the pylorus into the duodenum arising from a giant gastric hyperplastic polyp. We have successfully managed this patient with surgical intervention leading to positive clinical outcomes. On review of literature, we found that it is extremely rare to have a completely absent stomach on endoscopy in a patient with no previous surgical intervention. We would like to share our experience so that endoscopists are aware of such uncommon and interesting presentations. To the best of our knowledge, such a case has not been reported so far in literature.