A unicameral bone cyst has been called active when (DNB Dec 2009)
|A||The cyst abuts on the physis without any intervening normal bone|
|B||The cyst is larger than 1.5 cm in diameter|
|C||There is tenderness on palpation|
|D||The cyst has high levels of PGE2|
The cyst abuts on the physis without any intervening normal bone
Those unicameral bone cyst that abut on the physis have been called active and have a greater incidence of persistence after treatment than those separated from the physis by normal bone the inactive cysts.