A rare case of bilateral elastofibroma dorsi of the back with postoperative subthoracic seroma: Case report.

Rationale: Elastofibroma dorsi is a slow-growing, ill-defined benign soft tissue tumor characterized by excessive proliferation of fibroblast tissue. Tumors are made up of collagen and coarse elastic fibers. At present, the pathogenesis is unknown, and the incidence is extremely low.

Patient Concerns: A middle-aged and elderly male was admitted to our hospital, with chronic chest pain and palpable bilateral symmetrical dorsal subscapular mass.

Diagnoses: Computed tomography showed the presence of bilateral soft tissue tumors, considering bilateral elastofibroma dorsi.

Interventions And Outcomes: The lesion was completely removed by surgery.

Lessons: Elastofibroma dorsi is a relatively rare benign soft tissue tumor of the chest wall. For symptomatic patients with large tumor volumes, local tumor resection is feasible. It is recommended to routinely place negative pressure drainage tubes during surgery to effectively prevent postoperative local fluid accumulation. For postoperative patients with concurrent local fluid accumulation, the treatment effect of re-catheterization and drainage is good.