Case 4 - Arkansas Children's Hospital Little Rock, AR Click on
each slide thumbnail image for an enlarged view A seven year-old
girl noted increasing pain and discomfort in her left ankle. A
radiograph revealed a well-defined, cystic lesion of the talus.
A discrete fibro-osseous lesion permeates the bony cortex. The
lesion contains a mixture of bony spicules and cementum-like
bodies. The bony spicules have curvilinear outlines and comprise
woven and lamellar bone. Osteoblasts line the spicules. The
cementum-like bodies have irregular to globular outlines and
contain a slightly refractive, basophilic material. Some form
psammomatoid bodies. Bundles of parallel and whorled fibroblasts
form a fibro-collagenous stroma between the bony material. There
is no evidence of significant atypia or mitotic activity. Case 4
- Figure 1 - A fibro-osseous lesion contains abundant,
refractile, cementum-like bodies ("cementicles") enmeshed within
a bland, fibroblastic stroma. Case 4 - Figure 2 - Osteoblasts
rim a bony spicule w