All are true about aneurysmal bone cyst except -

Aneurysmal bone : Etiology and pathogenesis: 1 Traumatic event result in an area of haemorrhage that maintain connection with the original with the disrupted feeding vessels. Subsequently giant cell granuloma-like can develop after loss of connection with the original vascular source 2. Frequently develops secondary within another lesion of bone as a result of disrupted vascular dynamics in pre-existing intrabony lesion ex. Central giant cell tumors Age : Young adults < 30 Years Location: Shaft of long bones Veebral column 2% Jaw bone; posterior mandibular is more common Sex : No predilection Manifestations: Rapidly growing swelling Painful frequently with parathesia ref : maheswari 9th ed