Mello Filho A
Med Cutan Ibero Lat Am. 1985;13(5):401-5.
Pterygium inversum unguis (PIU) is a digital anomaly characterized by adherence of the subungueal tissue to the ventral surface of the distal nail plates. Universal medical literature in ten years reported 24 cases. The foresight that this anomaly could be more frequent, although unnoticed, led us to perform a survey through a systematic digital checking of all patients who were examined by us, in a 8 month period. In this period 2,000 clients were examined, 1,000 being of the female sex and 1,000 of the male sex. Eight cases of PIU of hands, with no familiar trait were diagnosed, 6 of them in females and 2 in males. From the cases in males, 1 was of the idiopathic congenital type and the other was of the secondary type (post-traumatic). From the cases identified in females, 5 were of the idiopathic type (4 acquired and 1 congenital) and 1 was of the secondary type (dermatomyositis). PIU was diagnosed in 8 of the 2,000 adult patients examined by us, reaching 0.4% in frequency. The final result was in accordance with our previous opinion that is not uncommon the incidence of the PIU allowing us to assemble in a short period of time a number of cases larger than any other survey found in medical literature.
甲下反向翼状胬肉（PIU）是一种手指异常，其特征为甲下组织与远端甲板腹面粘连。十年间的全球医学文献报道了24例。鉴于这种异常可能更常见，尽管未被注意到，这促使我们在8个月的时间里，通过对所有接受我们检查的患者进行系统的手指检查来开展一项调查。在此期间，共检查了2000名患者，其中1000名女性，1000名男性。诊断出8例手部PIU，无家族特征，其中6例为女性，2例为男性。在男性病例中，1例为特发性先天性类型，另1例为继发性类型（创伤后）。在女性病例中，5例为特发性类型（4例后天性和1例先天性），1例为继发性类型（皮肌炎）。在我们检查的2000名成年患者中，有8例诊断为PIU，发病率达0.4%。最终结果与我们之前的观点一致，即PIU的发病率并不罕见，这使我们能够在短时间内收集到比医学文献中任何其他调查都更多的病例。
