Involvement of the pelvis is more common. The lungs may be involved and the process is a cause of chylous pleural effusions. Presentation is anytime, but often adolescence. Massive osteolysis or Gorham's disease can be included in this name. Usually a single bone is involved and replaced by cystic spaces, often without bone reaction.
Involvement can begin with erosion of the margin of a bone.
Various anatomic expressions of pathology.