Exophytic pedunculated XXXX with remarkable cystic change.

@entity1 @entity5 @entity674 @entity432 @entity2280 @entity694 @entity356
A 59-year-old @entity1 with bloody stools, and previously diagnosed with sigmoid @entity694 , visited our hospital. Preoperative abdominal ultrasonography (US) showed another @entity5 , with an uneven irregular surface, measuring about 9 x 5 cm, below the left hypochondrium. The @entity5 consisted of several cysts. Abdominal computed tomography (CT) showed a multicystic @entity5 attached to the stomach, and its septum and marginal region were intensely stained on contrast imaging. On magnetic resonance imaging (MRI), low and markedly high signals were revealed in the @entity5 on T1-weighted and T2-weighted sequences, respectively. Contrast imaging of the upper digestive tract showed extramural compression of the greater curvature of the antral stomach by the @entity5 . The @entity5 was partially imaged by endoscopic ultrasonography (EUS), but continuity to the stomach was not confirmed. On abdominal angiography, the @entity5 was slightly stained via the @entity432 . Surgical treatment was performed to excise both the @entity356 and the sigmoid @entity694 . The @entity356 was removed with gastric wall tissue where the @entity5 was attached to a 2-cm pedicle. It was multicystic, contained watery fluid, and had a smooth outer surface. Histologically, the @entity5 consisted of multiple irregular cysts without epithelial lining, and solid epitheloid cell nests in between. The @entity5 cells had clear or eosinophilic cytoplasm and round nuclei. No mitotic figures were seen. The @entity5 cells in the pedicle were connected with the muscularis propriae of the stomach. Immunohistochemistry showed c-kit-positive, @entity2280 -positive smooth muscle actin (SMA)-negative, and S-100-negative staining of @entity5 cells. The final diagnosis was @entity674 ( @entity674 ).
