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Table 1 Retrorectal tumours.

From: Retrorectal tumours: literature review and Vilnius University Hospital "Santariskiu klinikos" experience of 14 cases

Congenital (55-6 5%): Osseous (5- 11%): Miscellaneous (12-16%):
Developmental cyst (up to 60% of congenital lesions): Osteoma Metastatic carcinoma
  Osteogenic sarcoma Lipoma/liposarcoma
   Dermoid Ewing's tumor Fibrosarcoma
   Epidermoid Chondromyxosarcoma Leiomyoma/leiomyosarcoma
Tailgut cyst Giant cell tumor Hemangioma
Teratoma Inflammatory (5%): Carcinoid tumors
Teratocarcinoma    Perineal or pelvirectal abscess Hemangioendothelial sarcoma
Chordoma    Diverticulitis Extra-abdominal desmoid
Anterior sacral meningocele    Crohn's disease Plasma cell myeloma
Rectal duplication    Foreign body granuloma Endothelioma
Adrenal rest tumor    Infectious granulomas Pelvic ectopic kidney
Neurogenic (10 -12%):   
   Neurofibroma   
   Ependymoma   
   Neurilemoma (Schwannoma)   
   Ganglioneuroma   Compiled from references [1, 2, 6, 8]