title: Laryngeal hibernoma: case series of a rare tumor.
abstract: BACKGROUND
  Hibernomas are rare, benign tumors of brown adipose tissue uncommonly found in the head and neck.
  
  
  METHODS
  A review of the English-language literature was conducted for this study. We present a series of 2 laryngeal hibernomas treated with transoral laser microsurgical resection at a tertiary referral center over a period of 18 years.
  
  
  RESULTS
  Only 2 cases of laryngeal hibernoma have been previously described in the literature. Two additional cases were encountered at our institution. Preoperative imaging demonstrated a well-circumscribed neoplasm with fat density compatible with lipoma, but internal heterogeneity and vascularity seen in the context of liposarcoma. Transoral laser microsurgical resection was successfully performed in each case.
  
  
  CONCLUSIONS
  Despite unique radiographic features, hibernomas are difficult to distinguish from well-differentiated liposarcoma and lipoma variants without pathologic correlation. Complete surgical resection is indicated. In our experience, transoral laser microsurgical excision of laryngeal hibernomas is a safe, effective treatment modality with little associated morbidity.
authors: Department of Otolaryngology - Head and Neck Surgery, Mayo Clinic, Phoenix, Arizona.
authors: Rachel B
authors: RB
authors: Cain
authors: Matthew A
authors: MA
authors: Zarka
authors: Michael L
authors: ML
authors: Hinni
mesh_terms: D000368:Aged; D006801:Humans; D007822:Laryngeal Neoplasms / Q000473:pathology* / Q000601:surgery; D008067:Lipoma / Q000473:pathology* / Q000601:surgery; D008297:Male; D035583:Rare Diseases / Q000473:pathology* / Q000601:surgery
keywords: hibernoma; larynx; lasers; lipomatous tumor; oncology