Table 1 Classification of retro-rectal tumors
Congenital (55–65 %) Developmental cyst (epidermoid, dermoid) Cystic hamartoma (tailgut) Teratoma Rectal duplication Adrenal rest tumor Anterior sacral meningocele Chordoma Teratocarcinoma Neurogenic (10–12 %) Neurofibroma Ependymoma Neurilemoma (Schwannoma) Ganglioneuroma Neuroblastoma Neurofibrosarcoma Inflammatory (5 %) Granulomas Perineal or pelvirectal abscess Diverticulitis Crohn’s disease | Osseous (5–11 %) Osteoma Simple bone cyst Ewing’s tumor Giant cell tumor Chondrosarcoma Osteosarcoma Miscellaneous (12–16 %) Metastatic disease Lipoma/liposarcoma Fibroma/Fibrosarcoma Lymphangioma Carcinoid Desmoid tumor Leiomyoma/leiomyosarcoma Endothelioma Pelvic ectopic kidney |