01167nas a2200217   4500000000100000008004100001653002000042653003000062100001200092700001100104700001200115700001100127700001100138700001100149245006100160856007400221300001000295490000700305520062300312022001400935       2014                            d10aMalformed nails10aPterygium inversum unguis1 aBaek JH1 aKim HS1 aPark YM1 aKim HO1 aCho BK1 aLee JY00aA case of acquired idiopathic pterygium inversum unguis.  uhttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC4069649/pdf/ad-26-374.pdf  a374-60 v263 a<p>Pterygium inversum unguis (PIU) is a rare nail abnormality in which the distal nail bed adheres to the ventral surface of the nail plate, with obliteration of the distal groove. Because of the rarity of this condition, its exact origin is unknown. This disorder can be either congenital or acquired, with or without a family history. The acquired forms may be idiopathic or secondary to systemic connective tissue diseases or other causes such as stroke, neurofibromatosis, leprosy, or the use of nail fortifiers. We present an unusual case of acquired idiopathic PIU of the 10 fingernails in a 22-year-old man.</p>  a1013-9087