A rare collision tumour of basal cell carcinoma and malignant melanoma of the lower abdomen with distant metastases: a case report. (PubMed, Case Reports Plast Surg Hand Surg) - Sep 20, 2026 - "BRAF V600 mutation analysis was negative, and nivolumab plus ipilimumab was initiated. This case highlights how sampling bias and clinicopathological discordance can obscure aggressive malignant components in cutaneous collision tumours. In large, heterogeneous, or clinically aggressive cutaneous tumours, systematic multi-site sampling and prompt clinicopathological reassessment are essential when the initial pathological diagnosis does not fully explain the clinical behaviour."
Journal • Basal Cell Carcinoma • Hematological Disorders • Melanoma • Non-melanoma Skin Cancer • Oncology • Skin Cancer • Solid Tumor • BRAF
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Masato Tsuchiya; Mieko Uno; Ryuichi Azuma; Shota Murakami; Takaya Ichimura
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