A 78-Year-Old Man with Elastofibroma Dorsi Presenting as a Left Subscapular Mass.

BACKGROUND Elastofibroma dorsi is a rare, benign soft-tissue tumor, emerging in the subscapular area and exhibiting higher prevalence in elderly women. Despite its slow growth rate and asymptomatic nature in most patients, elastofibroma can cause swelling, pain, and discomfort during shoulder movements. Imaging and histopathologic data combined with a detailed history are essential to exclude malignancies and provide suitable treatment. CASE REPORT This report describes the case of a 78-year-old man with an incidental finding of elastofibroma dorsi, presenting as an asymptomatic left subscapular mass. Physical examination revealed the mass, the presence of which was later confirmed through an MRI scan. The tumor was surgically excised without any postoperative complications. Histopathologic findings from a biopsy supported the diagnosis of elastofibroma dorsi, showing an abundance of thick and irregular elastic fibers, giving a "rope-like" appearance in hematoxylin and eosin stain. Additionally, Verhoeff-Van Gieson stain highlighted the elastic fibers, making their characteristic arrangement and appearance evident. The patient was then discharged from our hospital and made a complete recovery. CONCLUSIONS Despite its benign nature and rarity, elastofibroma dorsi should be included in the differential diagnosis of subscapular masses. Proper imaging and histopathological examination are crucial for a definitive diagnosis, to ensure that patients receive the appropriate and necessary treatment and guidance. Furthermore, additional research is needed to completely clarify the pathophysiologic mechanism responsible for the development of elastofibroma dorsi.