Bulletin of Stomatology and Maxillofacial Surgery
ISSN 1829-006X
2026; 200–203
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COLLISION TUMOR OF BASAL CELL CARCINOMA AND SQUAMOUS CELL CARCINOMA OF THE NASAL SKIN; A CASE REPORT

Muhannad Kareem Shumran Al-Ghanimi*

Received: 2026-01-08 · Published: 2026-01-04

© 2026 The Author(s) and the original publisher.

CC BY-NC 4.0 This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
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Original title
COLLISION TUMOR OF BASAL CELL CARCINOMA AND SQUAMOUS CELL CARCINOMA OF THE NASAL SKIN; A CASE REPORT
Author
Muhannad Kareem Shumran Al-Ghanimi
Source journal
Bulletin of Stomatology and Maxillofacial Surgery
Published
2026-01-04
Licence
Creative Commons Attribution-NonCommercial 4.0 International
Original
https://doi.org/10.58240/1829006X-2025.21.12-200

Abstract

Collision tumors of two or more histologically separated neoplasms coexisting at the same anatomical site are rare pathological entities. We report a case of a 74-year-old female living in a rural resource-limited area who presented with a slowly growing, asymptomatic ulcerated lesion on the nasal skin. Excisional biopsy was performed with a 5 mm free margin, revealing a collision tumor comprising of basal cell carcinoma (BCC) and well-differentiated squamous cell carcinoma (SCC). The lesion showed clear separation with no evidence of transitional zones between the two components, differentiating it from basosquamous carcinoma. The patient underwent surgical excision, with no evidence of recurrence or metastasis observed during a six-month follow-up. Collision tumors, including both BCC and SCC, are exceptionally rare, and this represents, according to our knowledge, the first documented case in Iraq. Management should be tailored to the most aggressive histologic component, in this case, SCC. This case emphasized the importance of accurate histopathological diagnosis and highlights the need for increased clinical awareness in underserved regions.
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