Lift the Fig Leaf and check those figs. Klinefelter's Syndrome is the most common chromosomal abnormality in men yet it is the most under-diagnosed chromosomal condition. It is estimated that 45,000 males in the UK have undiagnosed Klinefelter's Syndrome. Download this application to check out the common symptoms with quick call and email buttons to a UK charity. Remember, you don't have to have all symptoms to have the condition.