2020 Volume 34 Issue 1 Pages 77-80
Here, we report a rare case of hibernoma (brown fat tumor) arising from the right chest wall. A 49-year-old asymptomatic woman was pointed out as showing a mass lesion in the right thoracic wall in a routine follow-up study after surgical and endocrine therapy for right breast cancer. Since this pleural-based, non-invasive mass had grown rapidly over a period of three months, differential diagnosis to rule out malignant neoplasias was required. We performed thoracoscopic marginal resection for diagnosis and treatment. Histopathologically, the tumor consisted of an intermixture of multivacuolated cells with granular eosinophilic cytoplasm and mature adipocytes with large single vacuoles.