Matter Adriana, Gioia Di Chiacchio Nilton, Di Chiacchio Nilton, Tassara Tavares Glaysson, Lipner Shari, Iorizzo Matilde
Dermatology Department, Hospital Santa Casa de Curitiba, Curitiba, Brazil.
Dermatology Department, Hospital do Servidor Público Municipal de São Paulo, São Paulo, Brazil.
Skin Appendage Disord. 2025 Apr;11(2):192-197. doi: 10.1159/000542243. Epub 2024 Dec 3.
Onychomatricoma is a benign tumor that originates from the nail matrix. The main clinical features reported include longitudinal thickening of the nail plate, splinter hemorrhages, and xanthonychia.
The aims of the study were to describe epidemiological, clinical, and dermoscopy data of patients with dark skin phototypes (Fitzpatrick IV, V, VI) diagnosed with onychomatricoma and to compare the findings with previously reported cases.
The medical records of 24 patients with dark skin phototype, and a diagnosis of onychomatricoma, collected from 2015 to 2023, were reviewed and analyzed.
Thirteen tumors (54.17%) occurred in the fingers and eleven tumors (45.83%) in the toenails. The main clinical and dermoscopic features found were increased nail thickness (21 cases; 88%), xanthonychia (20 cases; 83%), longitudinal melanonychia (18 cases; 75%), transverse hypercurvature of the nail plate (18 cases; 75%), and free edge cavitations (18 cases; 75%).
The clinical and dermoscopic features of onychomatricoma in patients with dark phototypes are similar to those in fair phototypes, except for the higher prevalence of melanonychia (75% vs. 24.2%).
甲母质瘤是一种起源于甲母质的良性肿瘤。报道的主要临床特征包括甲板纵向增厚、裂片形出血和黄甲。
本研究的目的是描述诊断为甲母质瘤的深色皮肤光类型（菲茨帕特里克IV、V、VI型）患者的流行病学、临床和皮肤镜检查数据，并将结果与先前报道的病例进行比较。
回顾并分析了2015年至2023年收集的24例深色皮肤光类型且诊断为甲母质瘤患者的病历。
13例肿瘤（54.17%）发生于手指，11例肿瘤（45.83%）发生于脚趾甲。发现的主要临床和皮肤镜特征为指甲增厚（21例；88%）、黄甲（20例；83%）、纵向黑甲（18例；75%）、甲板横向过度弯曲（18例；75%）和游离缘空洞（18例；75%）。
深色皮肤光类型患者的甲母质瘤临床和皮肤镜特征与浅色皮肤光类型患者相似，只是黑甲的患病率更高（75%对24.2%）。
