What are the top five rarest diseases in the world?

Please provide documentation if possible.

1. Hutchinson-Gilford Progeria
2. Fanconi anemia
3. Landau Kleffner Syndrome
4. Wilson's Disease
5. Canavan disease
6. fibrodysplasia osssificans progressiva (FOP)

threw in an extra for ya!

The G-Unit disease. Extremely Rare

There are many cases with one-of-a-kind diagnoses which cannot even be classified with present knowledge.

A known disease which has not occurred for many years is smallpox, but there's no warranty that it may be present in some remote area.

Tags

　　Reflex Sympathetic Dystrophy 　　Rectal Prolapse 　　Rectal Diseases 　　Rectal Cancer 　　Raynaud Disease 　　Rashes 　　Rare Diseases 　　Rape 　　Radon 　　Radiotherapy 　　Radiosurgery 　　Radionuclide Scans 　　Radiography

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