Table 1 .
The pathological types of 121 cases of primary retroperitoneal tumour (case count)
| Histologic origin | Benign | Malignant |
|---|---|---|
| Mesenchymal tissue | Lipoma (2) | Liposarcoma (8) |
| Fibroma (2) | Leiomyosarcoma (4) | |
| Leiomyoma (2) | Rhabdomyosarcoma (1) | |
| Angioma (1) | Malignant stromal tumours (3) | |
| Lymphangioma (7) | Malignant fibrous histiocytoma (2) | |
| Mesothelioma (1) | Aggressive fibromatosis (2) | |
| Angiomyolipoma (4) | ||
| Lymphoid tissue | Pseudolymphoma (2) | Malignant lymphoma (6) |
| Lymphoma (3) | ||
| Castleman’s disease (5) | ||
| Nervous tissue | Schwannoma (16) | Malignant schwannoma (1) |
| Neurofibroma (2) | Neuroectodermal tumour (1) | |
| Ganglioneuroma (12) | ||
| Pheochromocytoma (2) | ||
| Paraganglioma (7) | ||
| Embryo remnant, urogenital tissue | Benign cystic teratoma (4) | |
| Other or unknown origin | Cyst (7) | Low-grade malignant granuloma (1) |
| Ectopic bronchogenic cyst (1) | Follicular dendritic cell sarcoma (1) | |
| Pseudocyst (1) | Myxoid tumour (1) | |
| Myxoid cystadenoma (3) | Malignant small round cell tumour (1) | |
| Angioma (1) | Poorly differentiated carcinoma (1) | |
| Retroperitoneal neoplasm (1) | ||
| Inflammatory mass (1) | ||
| Pseudomyxoma (1) |