Bronchogenic cysts located in the gastric wall are most often asymptomatic and discovered incidentally during a radiological or endoscopic test. The risk of further complication (intracystic bleeding, superinfection, compression) is not known in this location [
3] whereas there is a high risk of further complications with pulmonary bronchogenic cysts. The morphology of gastric bronchogenic cysts may be misleading. In endoscopy they look like external compressions or submucosal masses suggestive of stromal tumor especially if located in the fundus. Usually, a histological examination also does not help the diagnosis. A computed tomography scan shows a round or oval-shaped mass, well-circumscribed and thin-walled, with fluid density and no enhancement after injecting the contrast agent. However, the lesion can be misdiagnosed as a solid mass in cases in which it contains thick mucinous and proteinaceous secretions [
4]. An EUS test shows a hypoechoic or anechoic, well-circumscribed, round or oval lesion which is located in the fourth hypoechoic layer of the gastric wall. Despite a good performance in terms of diagnosing gastric bronchogenic cysts, EUSs can sometimes be limited by the variability of the components of the cyst content. In the presence of thick fluid content, an EUS cannot exclude an encysted stromal tumor, which can also be located in the fourth hypoechoic layer and may contain intratumoral cysts. Some authors [
5,
6] suggest searching ciliated cells via a cytological study performed by an endosonographically-guided fine-needle aspiration. However, this aspiration can be challenging due to the thick content of the cyst and it may expose to superinfection of the cyst content [
3,
7]. The MRI was useful in the diagnosis [
4] by showing homogeneous hypersignal in sequences T1 and T2, with no enhancement after injecting the contrast agent, confirming the liquid nature of the cyst. In our patient’s case, confronting the results of the different morphological examinations allowed us to retain our gastric bronchogenic cyst diagnosis and we decided a mere endoscopic monitoring was sufficient treatment.