J Korean Assoc Oral Maxillofac Surg 2018; 44(1): 29~33
Primary sinonasal mucosal melanoma simulated as cystic lesions: a case report
Sung-Ho Shin1, Hyun Seok1,2, Seong-Gon Kim1, Seong-Doo Hong3
1Department of Oral and Maxillofacial Surgery, College of Dentistry, Gangneung-Wonju National University, Gangneung,
2Department of Oral and Maxillofacial Surgery, Chungbuk National University Hospital, Cheongju,
3Department of Oral Pathology, School of Dentistry, Seoul National University, Seoul, Korea
Hyun Seok
Department of Oral and Maxillofacial Surgery, Chungbuk National University Hospital, 776 1sunhwan-ro, Seowon-gu, Cheongju 28644, Korea
TEL: +82-43-269-3139 FAX: +82-43-269-6387
E-mail: sok8585@hanmail.net
ORCID: http://orcid.org/0000-0002-5278-3807
Received June 14, 2017; Revised July 19, 2017; Accepted August 16, 2017.; Published online February 28, 2018.
© Korean Association of Oral and Maxillofacial Surgeons. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Sinonasal mucosal melanoma (SNMM) in the maxillary sinus is a rare disease condition. Compared to oral mucosal melanoma, SNMM has a bulky, exophytic, and polypoid appearance, is weakly pigmented, and associated with unspecific symptoms. Due to these features, SNMM in the maxillary sinus has been misdiagnosed as nasal polyps and chronic sinusitis. In this case report, we described SNMM occurring in the right maxillary sinus simulated as a cystic or benign lesion. Cortical bone thinning and expansion were observed around the mass. The excised soft mass was encapsulated and weakly pigmented. The mass was clearly excised and covered with a pedicled buccal fat pad graft. Diagnosis using immunohistochemistry with S-100 and homatropine methylbromide-45 (HMB-45) is critical for proper treatment.
Keywords: Sinonasal mucosal melanoma, Maxillary sinus, Buccal fat pad, S-100, Homatropine methylbromide-45

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28 February 2018
Vol. 44
No. 1 pp. 1~39

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