Sinonasal undifferentiated carcinoma
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Sinonasal undifferentiated carcinoma, abbreviated SNUC, is a rare epithelial malignancy of the head and neck.
| Sinonasal undifferentiated carcinoma | |
|---|---|
| Diagnosis in short | |
 SNUC. H&E stain. | |
|
| |
| LM | tumour with variable architecture (nested, trabecular or lobular), small-to-moderate cytoplasm, +/-distinct nucleoli, cell size variable (small to large); glandular and squamous differentiation are absent by definition |
| LM DDx | poorly differentiated squamous cell carcinoma of the head and neck, small cell carcinoma, SMARCB1-deficient sinonasal carcinoma, others |
| IHC | pankeratin +ve, EMA +ve, CK7 +ve, CK5/6 -ve, NSE +ve/-ve, chromogranin A -ve, synaptophysin -ve, p63 +ve/-ve |
| Site | head and neck |
|
| |
| Prevalence | rare |
| Prognosis | poor |
| Clin. DDx | other head and neck tumours |
General
Microscopic
Features:[3]
- Architecture: nested, trabecular or lobular.
- Distinct cellular borders.
- Small-to-moderate cytoplasm.
- +/-Distinct nucleoli.
- Tumour cell size variable (small to large).
Note:
- Glandular and squamous differentiation are absent by definition.[4]
DDx:
- Poorly differentiated squamous cell carcinoma of the head and neck.
- Small cell carcinoma.
- SMARCB1-deficient sinonasal carcinoma.[5]
- Other tumours, especially small round blue cell tumours and lymphoma.
Images
www:
SNUC - low mag. (WC)
SNUC - high mag. (WC)
SNUC - very high mag. (WC)
IHC
Features:[3]
Others:
- NSE +ve/-ve.
- Chromogranin A -ve.
- Synaptophysin -ve.
- p63 +ve/-ve.[6]
- SMARCB1 (INI1) +ve (nuclear staining present).
- Nuclear staining lost in SMARCB1-deficient sinonasal carcinoma.
Comparison between different sinonasal carcinomas
Based on a modest size study, keratins can subclassify sinonasal carcinomas:[7]
| Diagnosis | CK4 | CK5/6 | CK7 | CK13 | CK14 | CK19 |
|---|---|---|---|---|---|---|
| Sinonasal undifferentiated carcinoma (SNUC) | 0% | 0% | 50% | 0% | 0% | 50% |
| Nasopharyngeal-type undifferentiated carcinoma (NPTC) | 0% | 80% | 0% | 80% | 0% | 100% |
| Nonkeratinizing squamous cell carcinoma (NKSCC) | 0% | 90% | 0% | 80% | 80% | 90% |
| Squamous cell carcinoma (keratainizing) | 30% | 90% | 60% | 90% | 80% | 90% |
See also
References
- ↑ Pitman, KT.; Costantino, PD.; Lassen, LF. (1995). "Sinonasal undifferentiated carcinoma: current trends in treatment.". Skull Base Surg 5 (4): 269-72. PMC 1656535. PMID 17170968. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1656535/.
- ↑ Al-Mamgani, A.; van Rooij, P.; Mehilal, R.; Tans, L.; Levendag, PC. (Apr 2012). "Combined-modality treatment improved outcome in sinonasal undifferentiated carcinoma: single-institutional experience of 21 patients and review of the literature.". Eur Arch Otorhinolaryngol. doi:10.1007/s00405-012-2008-5. PMID 22476411.
- ↑ 3.0 3.1 Humphrey, Peter A; Dehner, Louis P; Pfeifer, John D (2008). The Washington Manual of Surgical Pathology (1st ed.). Lippincott Williams & Wilkins. pp. 38. ISBN 978-0781765275.
- ↑ 4.0 4.1 Mills, SE. (Mar 2002). "Neuroectodermal neoplasms of the head and neck with emphasis on neuroendocrine carcinomas.". Mod Pathol 15 (3): 264-78. doi:10.1038/modpathol.3880522. PMID 11904342.
- ↑ Bishop, JA.; Antonescu, CR.; Westra, WH. (Sep 2014). "SMARCB1 (INI-1)-deficient carcinomas of the sinonasal tract.". Am J Surg Pathol 38 (9): 1282-9. doi:10.1097/PAS.0000000000000285. PMID 25007146.
- ↑ Wadsworth, B.; Bumpous, JM.; Martin, AW.; Nowacki, MR.; Jenson, AB.; Farghaly, H. (Dec 2011). "Expression of p16 in sinonasal undifferentiated carcinoma (SNUC) without associated human papillomavirus (HPV).". Head Neck Pathol 5 (4): 349-54. doi:10.1007/s12105-011-0285-8. PMC 3210220. PMID 21805120. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3210220/.
- ↑ "Sinonasal undifferentiated carcinoma, nasopharyngeal-type undifferentiated carcinoma, and keratinizing and nonkeratinizing squamous cell carcinoma express different cytokeratin patterns". Am J Surg Pathol 26 (12): 1597–604. December 2002. doi:10.1097/00000478-200212000-00007. PMID 12459626.