Nasopharyngeal carcinoma

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Nasopharyngeal carcinoma
Diagnosis in short

Nasopharyngeal carcinoma. H&E stain.

LM Cohesive typical (squamoid) cells (abundant dense eosinophilic cytoplasm, central nuclei +/- small/indistinct nucleoli), prominent lymphoid component
LM DDx HPV-associated head and neck squamous cell carcinoma, squamous cell carcinoma of the head and neck
IHC EBER +ve, p16 -ve
Site head and neck

Nasopharyngeal carcinoma, abbreviated NPC, is malignant epithelial tumour of the head and neck closely related to squamous cell carcinoma.

General

  • "Nasopharyngeal carcinoma" is the name of an entity - it is not a descriptive term.
  • Strong association with Epstein-Barr virus (EBV).

Note:

Gross

  • Nasopharynx - as the name would suggest.

Microscopic

Features:[1]

  • Prominent lymphoid component - key feature.
  • Features of squamous cell carcinoma:
    • Cohesive cells with:
      • Abundant dense eosinophilic cytoplasm.
      • Central nuclei +/- small/indistinct nucleoli.

DDx:

Images

www:

Histologic subclassification

World Health Classification (2005) for NPC:[2]

Type Histology Description EBV Prevalence Prognosis
1 keratinizing SCC graded poorly-well-diff. -ve ? bad
2a nonkeratinizing carcinoma, differentiated well def. cell borders & tumour nest borders, mimics appearance of UCC +ve ? good
2b nonkeratinizing carcinoma, undifferentiated sheets/syncytial, vescicular nuclei, prominent nucleoli, pink cytoplasm ? most common ?
3 basaloid SCC mimics BCC - see basaloid SCC ? least common ?

How to remember KNUB:

  • Keratinizing, Non-keratinizing diff., non-keratinizing Undiff., Basaloid SCC.

IHC

  • EBER +ve.
  • p16 -ve.[3]

Notes:

See also

References

  1. Klatt, Edward C. (2006). Robbins and Cotran Atlas of Pathology (1st ed.). Saunders. pp. 145. ISBN 978-1416002741.
  2. Humphrey, Peter A; Dehner, Louis P; Pfeifer, John D (2008). The Washington Manual of Surgical Pathology (1st ed.). Lippincott Williams & Wilkins. pp. 39. ISBN 978-0781765275.
  3. Gulley ML, Nicholls JM, Schneider BG, Amin MB, Ro JY, Geradts J (April 1998). "Nasopharyngeal carcinomas frequently lack the p16/MTS1 tumor suppressor protein but consistently express the retinoblastoma gene product". Am. J. Pathol. 152 (4): 865–9. PMC 1858242. PMID 9546345. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1858242/.
  4. Singhi, AD.; Califano, J.; Westra, WH. (Feb 2012). "High-risk human papillomavirus in nasopharyngeal carcinoma.". Head Neck 34 (2): 213-8. doi:10.1002/hed.21714. PMID 21484924.