Atypical Presentation of Subungal Melanoma

Abstract

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/ 3.0/) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.Malignant melanomas sometimes present with nail or periungual pigmentation, as a subungual melanoma. This pigmentation also occurs in nonmelanoma skin disorders. Therefore, biopsy is mandatory for the absolute diagnosis. We present an atypical presentation of subungual melanoma in an 81-year-old female patient with no specific periungual pigmentation. She suffered from a crushing injury in her right thumb 2 years ago and had undergone repetitive stump plasty at a local clinic. Recently, she felt intermittent pain at the thumb tip. During the revisional stump plasty, we unexpectedly noted a spread out of dark colored soft tissues the distal phalanx. Pathological examination revealed subungual malignant melanoma. This unusual form of melanoma has a predilection for an acral location, particularly the paronychial region. Even when small pigments are found on the periungual area, careful examination and identification of a component of melanoma is necessary in order to not miss any malignant finger lesion.

Wet Chemical Treatment and Mg Doping of p‐InP Surfaces for Ohmic Low‐Resistive Metal Contacts

“…[13][14][15][16][17][18][19][20] Fabrication of the ohmic contact for p-InP has been more difficult than for n-InP. [21][22][23][24][25][26][27][28] One established reason for the p-InP contact challenges is a relatively strong diffusion of p-type doping atoms (i.e., group-II elements) in InP at the growth and/or postheating temperatures. That leads to a variation in the doping concentration, which can for example cause a hole concentration decrease at p-InP surfaces and thus an increase in the contact resistance.…”