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Copyright ©The Author(s) 2021.
World J Gastrointest Surg. Nov 27, 2021; 13(11): 1327-1337
Published online Nov 27, 2021. doi: 10.4240/wjgs.v13.i11.1327
Table 1 The classification of retrorectal tumors[10,11]

Benign
Malignant
CongenitalDevelopmental cysts (Tail-gut, epidermoid, dermoid, teratoma)Chordoma
Anterior sacral meningoceleTeratocarcinoma
Adrenal rest tumor
NeurogenicSchwannomaNeuroblastoma
NeurofibromaMalignant nerve sheath tumors
GanglioneuromaGanglioneuroblastoma Ependymoma
OsseousGiant-cell tumorOsteogenic sarcoma
OsteoblastomaEwing sarcoma
Aneurysmal bone cystChondrosarcoma
Myeloma
InflammatoryAbscess/hematoma
MiscellaneousLipomaLiposarcoma
FibromaFibrosarcoma
HemangiomaHemangiopericytoma
EndotheliomaLeiomyosarcoma
LeiomyomaMetastatic carcinoma