People with type 1 HHT, which is caused by a mutation in the ENG gene, had an average life expectancy of 76.4 years. People with type 2 HHT, which involves a mutation in the ACVRL1 gene, had a ...

Type 1 involves tiny aneurysms forming as blood vessels dilate. Macular telangiectasia can cause loss of central vision and presently has no approved treatment options. | Image credit: Satjawat ...