Table 1.

Classification scheme for presacral masses

Origin	Benign	Malignant
Congenital	Cystic hamartoma	Immature teratoma
	Duplication cyst	Yolk sac tumour
	Dermoid cyst (mature teratoma)
	Anterior sacral myelomeningocele
Osseous	Aneurysmal bone cyst	Osteosarcoma
	Giant-cell tumour	Ewing's sarcoma
		Chondrosarcoma
		Plasmacytoma
		Metastasis
Mesenchymal	Myelolipoma	Fibrosarcoma
	Haemangioma	Gastrointestinal stromal tumour
	Fibroma	Lymphoma
	Hibernoma
	Castleman disease
Neurogenic	Neurofibroma	Chordoma
	Schwannoma	Malignant schwannoma
	Ependymoma
	Dural ectasia
Miscellaneous	Infectious	Desmoplastic round-cell tumour
	Inflammatory	Metastasis
	Post traumatic