|This photo illustrates an extreme case of osteopenia. Note the loss of
(shell) bone, exposing the rib cage. (This is about as bad as it gets.)
Osteopenia of the shell is common in captive chelonians and likely due
suboptimal nutrition. Surprisingly, this tortoise was a wild animal.
with fibrous osteodystrophy replace lost bone with fibrous tissue
osteodystrophy), but chelonians have a much less prominent fibrous
and osteopenia may be a more accurate term. Photo courtesy University of
Florida, Dept of Pathobiology.|