Giant hypopharyngeal atypical lipomatous tumor

Chapman McQueen, Elizabeth Montgomery, Barbara Dufour, Mary S. Olney, Peter B. Illei

Research output: Contribution to journalReview articlepeer-review

8 Scopus citations


The so-called "giant fibrovascular polyps" of the esophagus and hypopharynx typically present as sausage-like pedunculated structures that protrude into the lumen and cause obstructive symptoms. Most are cured by local resection but they may recur. Microscopically, they display an admixture of fibrovascular and adipose tissue that is coated by unremarkable squamous mucosa. Here, we report a case that had scattered hyperchromatic cells and lipoblasts within the adipose tissue component. In other anatomic sites similar appearing lesions have been interpreted as pedunculated liposarcomas/atypical lipomatous tumors that are more prone to local recurrences than classic giant fibrovascular polyps. Reports of dedifferentiation and metastases are lacking thus raising the possibility that the cytologic findings in such lesions are degenerative. To confirm our suspicion of liposarcomatous differentiation, we performed immunohistochemistry for MDM2 and p53, 2 markers that are known to be negative in benign lipomatous lesions and positive in well-differentiated liposarcomas/atypical lipomatous tumors. The scattered atypical hyperchromatic cells and the lipoblasts both exhibited strong nuclear staining for both markers and supported the diagnosis of pedunculated giant hypopharyngeal atypical lipomatous tumor.

Original languageEnglish (US)
Pages (from-to)38-41
Number of pages4
JournalAdvances in anatomic pathology
Issue number1
StatePublished - Jan 2010


  • Atypical lipomatous tumor
  • Giant fibrovascular polyp
  • MDM2
  • P53
  • Well-differentiated liposarcoma

ASJC Scopus subject areas

  • Anatomy
  • Pathology and Forensic Medicine


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