Name 10 causes of abdominal mass in older infants and children.

Renal causes
1. Wilms’ tumor (20% of cases)
2. Hydronephrosis (20% of cases

Retroperitoneal causes
3. Neuroblastoma (20% of cases); displaces kidney
4. Pancreatic

Gastrointestinal causes
5. Appendiceal abscess
6. Hepatobiliary mass
7. Enteric duplication or mesenteric cyst

Genital causes
8. Ovarian cyst
9. Hydrometrocolpos
10.Ovarian teratoma or dermoid cyst