Finger Clubbing

http://www.merck.com/mmhe/sec04/ch039/ch039b.html

Finger Clubbing

Finger clubbing is an enlargement of the tips of the fingers or toes and a loss of the angle where the nails emerge.

Finger clubbing occurs when the amount of soft tissue beneath the nailbeds increases. The reason this increase occurs is not clear, but clubbing seems to occur with some pulmonary disorders (lung cancer, lung abscess, bronchiectasis), but not with others (pneumonia, asthma, emphysema). Finger clubbing also occurs with some congenital heart diseases or, in some cases, may be inherited and not indicate any disease."