Retrorectal mass

  • Developmental cysts
    • Epidermoid
    • Dermoid
    • Enteric (cystic hamartoma or rectal duplication)
  • Sacral lesions
    • Teratoma
    • Anterior sacral meningocele
    • Chordoma 
    • Lymphangioma
  • Anorectal lesions
    • Lipoma 
    • GIST
    • Anal gland cyst