“…In fact, high FDG retention can be observed in benign lesion originating from tissues characterized by high glycolytic rate. This finding frequently occurs in benign neoplasms originating from brown fat, defined as "hibernomas", whose low prevalence (1.6% of benign lipomatous tumors) often prevents a correct identification [2][3][4]. Actually, these lesions are most frequently observed in areas occupied by brown persists after fetal life (mediastinum, retroperitoneum, as well as paravertebral, supra-clavear and laterocervical spaces) [5].…”