title: An unusual case of low-grade tubulopapillary adenocarcinoma of the sinonasal tract.
abstract: BACKGROUND
  Low-grade papillary adenocarcinomas of the sinonasal tract are rare neoplasms. Over recent years, little doubt remains that this tumour represents a separate entity based on morphology, ultrastructural features and behaviour. We outline a case of this rare entity displaying a not hitherto described immunophenotype.
  
  
  METHODS
  A 32 year old man presented recurrent epistaxis was evaluated with endoscopy which revealed a well circumscribed pedunculated mass lesion in left nares. The mass was arising from the nasal septum which was excised along with the mass. The biopsy revealed low-grade, non-intestinal type sinonasal tubulopapillary adenocarcinoma.
  
  
  CONCLUSIONS
  TTF-1 immunoreactivity in absence of thyroid or pulmonary primary in the present case remains an enigma. However, this raises the possibility of the utility of this antibody to predict a better clinical outcome in the subset of low grade non-intestinal sinonasal adenocarcinoma. More cases of similar morphological appearance may need to be examined for TTF-1 immunoreactivity and clinically followed up to establish this theory.
authors.affiliation: Department of Histopathology, Wirral Hospitals NHS Trust, Upton, Wirral, CH49 5PE, UK. ask4ashish@gmail.com
authors.forename: Ashish
authors.initials: A
authors.lastname: Bansal
authors.forename: Keloth E
authors.initials: KE
authors.lastname: Pradeep
authors.forename: Krishna P
authors.initials: KP
authors.lastname: Gumparthy
mesh_terms: D000231:Adenocarcinoma, Papillary / Q000378:metabolism / Q000473:pathology*; D000328:Adult; D014408:Biomarkers, Tumor / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000378:metabolism; D006801:Humans; D008297:Male; D010255:Paranasal Sinus Neoplasms / Q000378:metabolism / Q000473:pathology*; D014157:Transcription Factors
chemical_list: D014408:Biomarkers, Tumor; D004268:DNA-Binding Proteins; C504003:TTF1 protein, human; D014157:Transcription Factors