[Elastofibroma dorsi].

We report on an 80-years-old woman suffering from subacute prurigo simplex, who had developed a painless subcutaneous tumor on her right upper back, 8 cm in diameter. In palpation, the tumor was firm and did not adhere to the overlying skin. The movability of her arms and back was not restricted. The tumor could not be distinguished from its surrounding tissue by means of ultrasound. Surgery revealed that the tumor was firmly attached to the thoracic fasciae, periosteum, and ligaments, which prevented its complete removal. On histological examination, the tumor was diagnosed as elastofibroma dorsi. We discuss our microscopical findings of this very rare neoplasm in detail.