May Be Caused by

 Common

Aneurysmal bone cyst

Bone tumor

Chordoma

Dermoid cyst

Fracture

Giant cell tumor

Hematoma

Metastasis

Myeloma

Normal variant

Pelvic surgery

Presacral abscess

Prostate carcinoma

Sarcoma

Teratoma

 Uncommon

Anal stenosis

Anterior meningocele

Anterior sacral meningocele

Arachnoid cyst

Currarino triad

Dermoid

Ectopic kidney

Ectopic prostate tissue

Ependymoma

Extradural cyst

Familial presacral mass

Hamartoma

Hydatid cyst

Hydroureter

Inflammation

Intraspinal lipoma

Lymphocele

Lymphoma

Neoplasm

Neurenteric cyst

Neuroenteric cyst

Neurofibromatosis type 1

Neurogenic tumor

Osteomyelitis of sacrum

Ovarian cyst

Ovarian neoplasm

Presacral ependymoma

Rectal duplication

Retroperitoneal fibrosis

Tailgut cyst

Tarlov cyst

Tubo-ovarian abscess

Urinoma