Bone metastasis may be the first sign that you have cancer, or bone metastasis may occur years after cancer treatment. Bone metastasis can cause pain and broken bones. With rare exceptions, cancer that has spread to the bones can't be cured. Treatments can help reduce pain and other symptoms of bone metastases.
Medical Definition of Chondrichthyes. : a class comprising cartilaginous fishes with well-developed jaws and including the sharks, skates, rays, chimeras, and extinct related formsâcompare cyclostomata.
Chondrichthyes and osteichthyes are the main two taxonomic classes of the fishes, cartilaginous and bony fish respectively.These two together make up almost all the fish species happen to exist on the Earth. Altogether, there are 28,000 species of bony and cartilaginous fish.hondrichthyes vs Osteichthyes. Chondrichthyes and osteichthyes are the main two taxonomic classes of the fishes, cartilaginous and bony fish respectively. These two together make up almost all the fish species happen to exist on the Earth. Altogether, there are 28,000 species of bony and cartilaginous fish.