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Spitz nevus is a benign melanocytic nevus, common in children or young adults, and it has histological features that are confused with those of malignant melanoma. Polypoid Spitz nevus is the benign counterpart of polypoid malignant melanoma. A 22-year-old woman presented with a solitary 1.5×1.5 cm-sized firm polypoid erythematous nodule on the left thigh. On dermoscopy, pink to yellowish lagoons intermingled by white fibrous septa were found but milky red globules or irregular linear vessels were not found. Therefore, melanoma almost could be ruled out cautiously. Histopathology showed symmetrical, well-circumscribed, polypoid architecture with predominant dermal nests of spindle cells. Immunohistochemically, the nevus cells were strongly positive for S-100 protein and negative for HMB-45. Thus, the diagnosis of polypoid Spitz nevus was made. Herein, we report a case of polypoid Spitz nevus that was differentiated from polypoid melanoma by histopathologic and dermoscopic findings. (Korean J Dermatol 2016;54(4):293∼296)
Vinorelbine, a vinca alkaloid anticancer drug, is widely used to treat various cancers. Several dermatological side effects of vinorelbine, such as acral erythema, phlebitis, and severe extravasation reactions, have been reported. Vinorelbine is categorized as non-DNA binding vesicant that undergoes high metabolism and clearance, which limits the degree of tissue injury if extravasation occurs. A 73-year-old male presented with erythematous linear patches on his left wrist and a 51-year-old male presented with erythematous eroded patches and bullae on his right forearm. Histopathologic study showed interface changes with basal vacuolar degeneration and epidermal dysmaturation. Separation of the dermis from the epidermis was observed, as well as interstitial and perivascular inflammatory infiltrates in the dermis. Both patients were being treated with vinorelbine for lung cancer. Before the onset of the skin lesions, accidental intravenous extravasation of vinorelbine had occurred. Herein, we report two cases of chemotherapy induced drug reaction due to extravasation of vinorelbine. (Korean J Dermatol 2016;54(5):372∼376)