A palpable elongated mass in the epigastric region of children may be caused by liver cysts, hydronephrosis, lymphangioma, etc. 1. Liver cysts: When the bile ducts are inflamed or blocked by stones, a large amount of bile will be secreted, leading to bile retention, which will result in a palpable elongated mass in the child’s upper abdomen. 2. Hydronephrosis: Tumors, polyps and other new tissues in the renal pelvis and ureter can block the ureter, leading to hydronephrosis. Ureteral stones that block the ureter and prevent urine from passing out of the ureter and bladder can also lead to hydronephrosis, which can result in a palpable, elongated mass in the child’s upper abdomen. 3. Lymphangioma: Lymphangioma can be an enlarged lymph node or an elongated mass formed by the fusion of diseased lymph nodes. If the elongated mass is palpable in the upper abdomen of children and the symptoms are not relieved, they should pay more attention to it and seek for medical treatment in time to avoid delaying the condition.