In anatomy, a variety refers to deviations from the norm in the construction, size and shape of organs. In contrast to malformations and abnormalities , varieties are not associated with functional limitations or clinical manifestations, although the delimitation is not always consistent. Thus, a cervical rib , which is an example of an accessory bone, is considered a variety but can clinically lead to cervical rib syndrome. There may also be varieties that, like a sixth finger or a sixth toe ( hexadactyly ), occasionally appear individually, but sometimes also express an underlying genetic defect and complex syndrome .
On the other hand, the information on frequency fluctuates strongly, which may be due to the population examined, but may also be due to a distorted perception if, for example, conclusions are drawn about the population from a case collection in a clinic. The frequency for a disc meniscus is given as 0.4 - 17%.