title: Nonkeratinizing undifferentiated nasopharyngeal carcinoma: a case report.
abstract: BACKGROUND
  Nasopharyngeal carcinoma, a malignant neoplasm of squamous origin, is an uncommon neoplasm in the United States, although it is a significant cause of morbidity and mortality in southeast Asia and northern Africa. These lesions arise most frequently from the lateral wall of the nasopharynx and may be locally aggressive or metastasize regionally or distantly.
  
  
  METHODS
  A 46-year-old African American male presented to our institution with a 5-month history of nasal congestion. Imaging studies revealed a mass filling the right sphenoid sinus and eroding into the adjacent sinuses and temporal bone. A biopsy was performed, and immediate imprint cytology showed two populations of cells, lymphoid cells and cohesive clusters of cells with prominent nucleoli. A diagnosis favoring nasopharyngeal carcinoma was rendered, and subsequent histology showed a nonkeratinizing undifferentiated nasopharyngeal carcinoma.
  
  
  CONCLUSIONS
  Nasopharyngeal carcinoma, particularly in its nonkeratinizing undifferentiated form, may mimic inflammatory and lymphoproliferative disorders. Careful examination for the distinct cytologic features is necessary for accurate diagnosis and subsequent treatment.
authors.affiliation: Department of Pathology, University of South Alabama, Mobile, Alabama 36617, USA. ecarter@usouthal.edu
authors.forename: J Elliot
authors.initials: JE
authors.lastname: Carter
authors.forename: Suman
authors.initials: S
authors.lastname: Goel
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D003937:Diagnosis, Differential; D006801:Humans; D008232:Lymphoproliferative Disorders / Q000175:diagnosis; D008297:Male; D008875:Middle Aged; D009303:Nasopharyngeal Neoplasms / Q000473:pathology