Elastofibroma Dorsi as Differential Diagnosis in Tumors of the Thoracic Wall

We report the case of a 73-year-old woman who presented with a soft tissue tumor located between the scapula and the rib cage. Magnetic resonance imaging showed an inhomogeneous tumor on the right dorsolateral thoracic wall that measured 7 × 4 × 7 cm with contrast enhancement. The findings were suggestive of partial infiltration of intercostal muscles and were suspicious of a malignant tumor. After local excision at a district hospital had failed to render definitive diagnosis, the patient underwent complete resection of the tumor at our institution. Histology from the specimen was consistent with elastofibroma dorsi with free resection margins.