title: Late mucosal ball valve obstruction of a Billroth I anastomosis.
mesh_terms: D000328:Adult; D005743:Gastrectomy; D006801:Humans; D008297:Male; D011127:Polyps / Q000209:etiology / Q000601:surgery; D011183:Postoperative Complications; D013274:Stomach Neoplasms / Q000209:etiology* / Q000601:surgery