<s>[INST] <<SYS>> This is a medical question of type : frequency <</SYS>> How many people are affected by lymphedema-distichiasis syndrome ? [/INST] The prevalence of lymphedema-distichiasis syndrome is unknown. Because the extra eyelashes can be overlooked during a medical examination, researchers believe that some people with this condition may be misdiagnosed as having lymphedema only. </s>