Subungual exostosis D16.9

Dupuytren, 1847

Benign bone tumour occurring in one or more teeth; in case of para- or subungual occurrence, deformation of the terminal phalanx with disturbances of nail growth.

Type I: Congenital subungual exostoses, mainly on the big toe (more rarely other toes) of women. First manifestation usually between 20 and 30 years of age.

Type II: Acquired subungual exostoses, especially in the big toe of women. First manifestation at a higher age. Less frequent is the localization on the fingers. Cause either unknown or intermittent, locally acting traumas.

Predominantly occurring in adolescents or young adults.

Firm, subungual node, maximum 0.5 cm in size, which protrudes the nail plate due to growth and reactively leads to growth disorder of the nail. Pain due to pressure of the footwear.

Cell- and fiber-rich connective tissue with variable myxoid to sclerotic texture with transition from vascularized columnar cartilage to vascularized, trabecular bone Molecularly, a t(X;6)(q24-26;q15-15) translocalization will be detected (Wilk M et al. 2018).

Surgical ablation by orthopaedists.

1. Da Cambra MP et al (2014) Subungual exostosis of the toes: a systematic review. Clin Orthop Relat Res 472:1251-1259
2. Damron TA (2014): Subungual exostosis of the toes: a systematic review. Clin Orthop Relat Res 472:1260-1261
3. Wilk M et al (2018) Mesenchymal and neuronal tumors. In: Plewig G et al (ed.) Braun-Falco`s Dermatology, Venerology and Allergology. Springer publishing house SS 1887-1919
4. Ward CM et al (2013) Subungual exostosis of the finger: case report and review of the literature. Iowa Orthopedic J 33:228-231