Difference between revisions of "Granular cell tumour"
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===Micro=== | ===Micro=== | ||
The sections show skin with nests of cells in the mid dermis, extending to the subcutis. The cells that make up the nests have an abundant granular grey cytoplasm, and round regular nuclei without obvious nucleoli. No mitotic activity is readily apparent. The lesional cells focally wrap around nerve | The sections show skin with nests of cells in the mid dermis, extending to the subcutis. The cells that make up the nests are epithelioid and have an abundant granular grey cytoplasm, and round regular nuclei without obvious nucleoli. No mitotic activity is readily apparent. No necrosis is identified. No nuclear pleomorphism is apparent. The lesional cells focally wrap around nerve. The lesion is completely excised in the plane of section. | ||
==See also== | ==See also== | ||
Revision as of 16:01, 24 June 2014
| Granular cell tumour | |
|---|---|
| Diagnosis in short | |
_skin.jpg) Granular cell tumour. H&E stain. | |
|
| |
| LM | cells with abundant eosinophilic granular cytoplasm (granules ~ 1-3 micrometers, poorly demarcated on LM), +/-pseudoepitheliomatous hyperplasia |
| Subtypes | benign (common), malignant (uncommon) |
| LM DDx | squamous cell carcinoma, oncocytoma, adjacent ulcer, xanthoma, melanocytic nevus with neurotization |
| Stains | PAS +ve |
| IHC | S-100 +ve, CD68 +ve (cytoplasmic), vimentin +ve (membranous), calretinin +ve (usually) |
| EM | abundant lysosomes |
| Gross | yellow nodule |
| Site | typically head and neck - other sites: breast, skin, tongue, esophagus + more |
|
| |
| Syndromes | LEOPARD syndrome |
|
| |
| Prevalence | rare |
| Prognosis | usually good (benign) |
| Clin. DDx | xanthoma, other skin lesions |
The granular cell tumour is a rare histomorphologically distinctive neoplasm found at many sites. The classic location is the head and neck.
General
- Rare.
- Usually benign.
- May seen in the context of LEOPARD syndrome and a mutation in the PTPN11 gene.[1]
- PTPN11 = protein-tyrosine phosphatase non-receptor type 11.[2]
- Gene implicated in Noonan syndrome 1.
- PTPN11 = protein-tyrosine phosphatase non-receptor type 11.[2]
- May mimic (well-differentiated) squamous cell carcinoma - histopathologically.
- There is a well-described phenomenon called pseudoepitheliomatous hyperplasia.[3]
Sites
May be seen in any number of sites:
- Granular cell tumour of the breast.
- Granular cell tumour of the skin.
- Granular cell tumour of the tongue.
- Granular cell tumour of the esophagus.
Gross
- Yellow nodule.
DDx of yellow nodule:
- Granular cell tumour.
- Lipoma.
- Xanthoma.
Microscopic
Features:
- Cells eosinophilic or grey granular cytoplasm - key feature.
- Cytoplasm usually abundant.
- Granules (represent abundant lysosomes[4]):
- Size: 1-3 micrometers.
- Poorly demarcated (on light microscopy).
- Nested architecture.
- +/-Pseudoepitheliomatous hyperplasia.
- May mimic SCC.
DDx:
- Squamous cell carcinoma.
- Oncocytoma.
- Melanocytic nevus with neurotization.
- Xanthoma.
Malignant features
Features of malignancy (3 of 6 required):[5]
- Necrosis.
- Spindled tumour cells.
- Vesciular nuclei with large nucleoli.
- Mitoses (>2/10 HPF at 200x).
- High NC ratio.
- Pleomorphism.
Predictive of poor outcome:[5]
- Ki-67 >10%.
Special stains
- PAS +ve.
IHC
Features:[6]
- S100 +ve.
- CD68 +ve (cytoplasmic).
- Vimentin +ve (membranous).
- Calretinin +ve (90-95%).[7]
Images
GCT. (WC)
GCT - S-100. (WC)
_S-100.JPG)
EM
- Abundant lysosomes.[4]
- Round structures with variable (electron) density.
Images:
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SKIN LESION, NECK, EXCISION: - GRANULAR CELL TUMOUR. - MILD SOLAR ELASTOSIS. COMMENT: The lesional cells stain as follows: POSITIVE: S-100, CD68, vimentin, calretinin. NEGATIVE: HMB-45.
Micro
The sections show skin with nests of cells in the mid dermis, extending to the subcutis. The cells that make up the nests are epithelioid and have an abundant granular grey cytoplasm, and round regular nuclei without obvious nucleoli. No mitotic activity is readily apparent. No necrosis is identified. No nuclear pleomorphism is apparent. The lesional cells focally wrap around nerve. The lesion is completely excised in the plane of section.
See also
References
- ↑ Schrader, KA.; Nelson, TN.; De Luca, A.; Huntsman, DG.; McGillivray, BC. (Feb 2009). "Multiple granular cell tumors are an associated feature of LEOPARD syndrome caused by mutation in PTPN11.". Clin Genet 75 (2): 185-9. doi:10.1111/j.1399-0004.2008.01100.x. PMID 19054014.
- ↑ Online 'Mendelian Inheritance in Man' (OMIM) 176876
- ↑ Abu-Eid R, Landini G (March 2006). "Morphometrical differences between pseudoepitheliomatous hyperplasia in granular cell tumours and squamous cell carcinomas". Histopathology 48 (4): 407–16. doi:10.1111/j.1365-2559.2006.02350.x. PMID 16487362.
- ↑ 4.0 4.1 Ordóñez, NG. (Jul 1999). "Granular cell tumor: a review and update.". Adv Anat Pathol 6 (4): 186-203. PMID 10410172.
- ↑ 5.0 5.1 Fanburg-Smith JC, Meis-Kindblom JM, Fante R, Kindblom LG (July 1998). "Malignant granular cell tumor of soft tissue: diagnostic criteria and clinicopathologic correlation". Am. J. Surg. Pathol. 22 (7): 779–94. PMID 9669341.
- ↑ Rekhi, B.; Jambhekar, NA. (Jun 2010). "Morphologic spectrum, immunohistochemical analysis, and clinical features of a series of granular cell tumors of soft tissues: a study from a tertiary referral cancer center.". Ann Diagn Pathol 14 (3): 162-7. doi:10.1016/j.anndiagpath.2010.01.005. PMID 20471560.
- ↑ Fine, SW.; Li, M. (Feb 2003). "Expression of calretinin and the alpha-subunit of inhibin in granular cell tumors.". Am J Clin Pathol 119 (2): 259-64. doi:10.1309/GRH4-JWX6-J9J7-QQTA. PMID 12579997.