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Chondrosarcoma is an uncommon type of bone tumor that forms in cartilage, the smooth connective tissue that protects the ends of bones. Most often, the cancer originates in the hip, pelvis or shoulder, although it can also occur in the knee, skull, spine, windpipe (trachea) or ribs.

Chronic venous insufficiency occurs when malfunctioning valves in the leg veins prevent blood from flowing back to the heart. 

Congenital high airway obstruction syndrome is characterized by a blockage in a developing baby’s airway.

COVID-19 is a respiratory illness caused by the novel coronavirus, SARS-CoV-2.