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Microscopic features. A) Scanning magnification revealing poorly circumscribed nodules of eosinophilic spindle cells filling the dermis and extending into the subcutis (hematoxylin and eosin, original magnification 40x); B) higher magnification demonstrating fascicles of benign smooth muscle bundles without necrosis or nuclear atypia (hematoxylin and eosin, original magnification 100x)
