Narod SA. Tamoxifen ChemopreventionâEnd of the Road?. JAMA Oncol. 2015;1(8):1033â1034. doi:10.1001/jamaoncol.2015.2247. Download citation file:
About Rare Diseases. A rare disease is defined by the European Union as one that affects less than 5 in 10,000 of the general population. There are between 6,000 and 8,000 known rare diseases. Around five new rare diseases are described in medical literature each week.
CVT is listed as a rare disease by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that CVT, or a subtype of CVT, affects less than 200,000 people in the US population. CVT as a Disease. CVT: Another name for Vertical talus, congenital (or close medical condition association).