Elastofibroma dorsi was diagnosed in a 48-year-old woman with bilateral subscapular tumor masses diagnosed asynchronously in an interval of 4 months in spite of presence of another lesion at first admittance. She underwent subsequent resections of the lesions. They were diagnosed as elastofibroma. Reevaluation of the initial computerized tomography of thorax indicated an omitted small lesion with a 2-cm diameter and 25.2-day doubling time. Although the real neoplastic nature of elastofibroma is unknown, bilateral presence of the masses with different sizes and relatively short doubling times of the lesions must be kept in mind.