Collision Lesion ( 2 фото )

В ТГ "Бьютификация" пишут, что:

An 80-year-old woman presented to the plastic surgery clinic with a 6-month history of a skin lesion on the posterior aspect of her left upper arm. Physical examination revealed a brown lesion with irregular borders adjacent to a second, pink lesion with well-defined borders and superficial scaling (Panel A). On dermoscopy, the first lesion had a homogeneous brown color with eccentric hyperpigmented asymmetric globules representative of unevenly distributed nests of melanocytes along the dermoepidermal junction. The pink lesion had telangiectatic vessels and multiple small erosions (Panel B). On histopathological examination of an excisional biopsy specimen, the first lesion was identified as a melanoma in situ and the second lesion as a superficial basal-cell carcinoma. A diagnosis of a collision lesion of melanoma in situ and basal-cell carcinoma was made. A collision lesion is formed when two or more unique tumors with distinct boundaries occur in the same anatomical location. Collision lesions pose a diagnostic challenge because the clinical appearance of one lesion may mask or distract from the other lesion, resulting in misdiagnosis. A wide local excision was performed with clear margins. At follow-up 1 year after the procedure, no evidence of recurrence was found.
Maria Murphy, M.B., B.Ch., B.A.O., and Bernie Finneran, R.A.N.P., M.Sc.
Published January 3, 2026
N Engl J Med 2026;394: e4
DOI: 10.1056/NEJMicm2512705
VOL. 394 NO. 2


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