Ophanet, who are a consortium of European partners, currently defines a condition rare when if affects 1 person per 2,000. They list Chondrosarcoma as a "rare disease". More information about Chondrosarcoma is available from Orphanet
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Primary tumors of the spinal cord may be extramedullary (occurring outside the spinal cord) or intramedullary (occurring within the cord itself). Extramedullary tumors may be intradural (meningiomas and schwannomas), which account for 60% of all primary malignant spinal cord neoplasms, or extradural (metastatic tumors from breasts, lungs, prostate, leukemia, or lymphomas), which account for 25% of these malignant neoplasms.
Intramedullary tumors, or gliomas (astrocytomas or ependymomas), are comparatively rare, accounting for only about 10%. In children, they're low-grade astrocytomas.
Spinal cord tumors are rare compared with intracranial tumors (ratio of 1:4). They occur equally in men and women, with the exception of meningiomas, which occur mostly in women. Spinal cord tumors can occur anywhere along the length of the cord or its roots.
Source: Professional Guide to Diseases (Eighth Edition), 2005
The term 'prevalence' of Chondrosarcoma usually refers to the estimated population of people who are managing Chondrosarcoma at any given time. The term 'incidence' of Chondrosarcoma refers to the annual diagnosis rate, or the number of new cases of Chondrosarcoma diagnosed each year. Hence, these two statistics types can differ: a short-lived disease like flu can have high annual incidence but low prevalence, but a life-long disease like diabetes has a low annual incidence but high prevalence. For more information see about prevalence and incidence statistics.
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