Dysosteosclerosis: A rare inherited condition characterized by bone development abnormalities (excessive hardening of bone and flattened vertebrae), characteristic facial features. Excessive bone growth at the base of the skull can damage the optic nerves and affect vision.
Mastocytosis: A disorder where excessive amounts of mast cells proliferate in organs such as the skin, liver, bone, spleen and gastrointestinal tract. Mast cells occur in connective tissue and defend the body against disease by releasing histamine to stimulate the immune system.
Melorheostosis: A rare bone disorder involving overgrowth of the outer layer of bone in a linear pattern similar to wax dripping down the side of a candle. Usually one or more bones of a limb are affected.