Fig. 2From: Primary endobronchial melanoma: a case report and clinical management indicationsNeoplastic cells exhibited characteristic features, including medium-sized atypical epithelioid and spindle cells with eosinophilic cytoplasm, voluminous nuclei, and prominent nucleoli (A-B). Expression of pS100, Melan-A, and HMB-45 markers confirmed the melanocytic origin, with the absence of keratins AE1/AE3, confirming the diagnostic hypothesis of melanoma (C-D)Back to article page