Distribution of Benign and Malignant Diseases
| Benign | n | Malignant | n |
| Liver | |||
| Hemangioma | 1 | Hepatoblastoma | 10 |
| Hemangioendothelioma | 4 | Hepatocellular carcinoma | 1 |
| Focal nodular hyperplasia | 8 | Hepatic metastases from neuroblastoma | 3 |
| Hepatic adenoma | 1 | ||
| Hepatic regenerative nodule | 6 | ||
| Hepatic abscess presenting as mass | 2 | ||
| Kidney | |||
| Mesoblastic nephroma | 1 | Wilms tumors | 9 |
| Renal abscess presenting as mass | 2 | Renal cell carcinoma | 1 (1) |
| Angiomyolipoma | 1 | ||
| Adrenal | |||
| Ganglioneuroma | 2 | Neuroblastoma | 9 (3) |
| Adrenocortical carcinoma | 1 | ||
| Spleen | |||
| Hemangioma | 1 | ||
| Lymphangioma | 1 | ||
| Pancreas | |||
| Pseudopapillary tumor | 1 | Metastases from neuroblastoma | 1 |
| Ovary | |||
| Complex ovarian cyst | 1 | Granulosa cell tumor | 2 |
| Dermoid cyst | 1 | Germ cell tumor | 1 (1) |
| Teratoma | 4 (1) | Papillary ovarian carcinoma | 1 (1) |
| Other lesions | |||
| Aggressive desmoid fibromatosis | 3 (1) | Rhabdomyosarcoma | 8 (8) |
| Infradiaphragmatic sequestration presenting as mass | 2 | Ewing and soft-tissue sarcoma | 8 (5) |
| Schwannoma | 2 | ||
| Retroperitoneal phlegmon presenting as mass | 1 | Metastatic lymphadenopathy from neuroblastoma | 1 |
| Cystic lymphatic malformation | 1 | Osteosarcoma | 1 (1) |
| Desmoplastic small round cell tumor | 1 (1) | Lymphoma* | 13 (12) |
| Metastatic sinonasal carcinoma | 1 | ||
| Nasopharyngeal (nuclear protein in testis) carcinoma | 1 (1) |
↵* Including post–renal transplantation lymphoproliferative disorder.
Data in parentheses are proportion of investigated subgroup.