Maas E J, Craig J G, Swisher P K, Amin M B, Marcus N
Department of Radiology, Henry Ford Hospital, Detroit, MI 48202, USA.
Australas Radiol. 1998 Aug;42(3):267-70. doi: 10.1111/j.1440-1673.1998.tb00516.x.
An unusual case is presented here of simple bone cyst (SBC) with fluid-fluid levels on MR and cementum-like substance on microscopy in an atypical location in the distal femur. Fluid-fluid levels are commonly described in the literature within aneurysmal bone cysts, giant cell tumour, chondroblastomas and telangiectatic osteosarcomas, but a literature review revealed only one reported case with multiple fluid levels occurring in a simple bone cyst on MRI. A cementum-like matrix is diagnostic of SBC and is seen in approximately 10% of cases.
