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Case Reports in Pathology
Volume 2018, Article ID 7694272, 5 pages
https://doi.org/10.1155/2018/7694272
Case Report

Bednar Tumour Occurring after Malignant Melanoma Excision

1Anatomic Pathology, University of Rome Tor Vergata, Viale Oxford 81, 00133 Rome, Italy
2Surgery, University of Rome Tor Vergata, Viale Oxford 81, 00133 Rome, Italy
3Dermatology, University of Rome Tor Vergata, Viale Oxford 81, 00133 Rome, Italy

Correspondence should be addressed to Augusto Orlandi; ti.2amorinu@idnalro

Received 24 June 2018; Accepted 10 September 2018; Published 1 October 2018

Academic Editor: Stefan Pambuccian

Copyright © 2018 Amedeo Ferlosio et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We report the case of a seventy-four-year-old man with a slow-growing 2 cm mass on the back that arose near the surgical scar of previously excised melanoma, invasive to a Breslow depth of 3 mm. Preoperative clinical diagnosis was “in-transit” melanoma metastasis. After surgical excision, histopathologic examination revealed a dermal nodular proliferation of spindle cells arranged in storiform pattern, with mild pleomorphism, infiltrating around appendages and into the subcutaneous tissue. Immunohistochemical investigation documented diffuse positivity for CD34 and vimentin of spindle cells. Scattered dendritic cells, containing dark pigment in varying proportion and positive for S100, Melan-A and HMB-45, were also observed. A final diagnosis of Bednar tumour was formulated. Subsequently, the patient developed numerous metastases from the primary melanoma and died after 18 months. Bednar tumour is a rare pigmented variant of dermatofibrosarcoma protuberans of intermediate malignant potential. The presence of pigmented cells in Bednar tumour requires careful differential diagnosis with malignant or benign pigmented skin tumours. The clinical history of a Bednar tumour developing close to the scar of a previous melanoma gives the opportunity of a critical and intriguing discussion about the potential origin of pigmented cells in this rare variant of dermatofibrosarcoma protuberans.