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 share many common characteristics among each other; their main defining feature is having a cartilaginous skeleton. Other features found in Chondricthyes include similar coloration patterns, placoid scales, pectoral fins, and ampullae of lorenzini.hylum â Chordata. Class â Chrondrichthyes. The Chondrichthyes are considered the oldest existing jawed-vertebrates related to bony vertebrates (Osteichthyes) [2][4]. The earliest dated Chondricthyes fossils are from the Silurian period (444-416 mya).