Ramu,an 8 yrs old boy presented with pain in the arm.On x-ray his upper end of humerus demonstrates an expansile lesion in the metaphysis with breech of the overlying cortex.Most likely diagnosis is:

Ramu,an 8 yrs old boy presented with pain in the arm.On x-ray his uppe

1.	Ramu,an 8 yrs old boy presented with pain in the arm.On x-ray his upper end of humerus demonstrates an expansile lesion in the metaphysis with breech of the overlying cortex.Most likely diagnosis is:
A.	Aneurysmal bone cyst
B.	Unicameral bone cyst
C.	Chondroblastoma
D.	Osteoclastoma
Answer» B. Unicameral bone cyst