Difference between revisions of "Low-grade oncocytic renal tumour"
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| LMDDx = [[renal oncocytoma]], [[chromophobe renal cell carcinoma]] eosinophilic variant, [[clear cell renal cell carcinoma]] eosinophilic variant, [[papillary renal cell carcinoma]] oncocytic variant, [[tubulocystic carcinoma of the kidney]], other [[renal tumours with eosinophilic cytoplasm]], benign [[liver]] | | LMDDx = [[renal oncocytoma]], [[chromophobe renal cell carcinoma]] eosinophilic variant, [[clear cell renal cell carcinoma]] eosinophilic variant, [[papillary renal cell carcinoma]] oncocytic variant, [[tubulocystic carcinoma of the kidney]], other [[renal tumours with eosinophilic cytoplasm]], benign [[liver]] | ||
| Stains = | | Stains = | ||
| IHC = CK7 +ve, CD117 -ve, [[PAX8]] +ve | | IHC = CK7 +ve, CD117 -ve, [[PAX8]] +ve, GATA3 +ve | ||
| EM = | | EM = | ||
| Molecular = | | Molecular = | ||
| Line 62: | Line 62: | ||
==IHC== | ==IHC== | ||
Features: | Features:<ref>{{cite journal |authors=Ricci C, Ambrosi F, Franceschini T, Giunchi F, Grillini A, Franchini E, Grillini M, Schiavina R, Massari F, Mollica V, Tateo V, Bianchi FM, Bianchi L, Droghetti M, Maloberti T, Tallini G, Colecchia M, Acosta AM, Lobo J, Trpkov K, Fiorentino M, de Biase D |title=Evaluation of an institutional series of low-grade oncocytic tumor (LOT) of the kidney and review of the mutational landscape of LOT |journal=Virchows Arch |volume= |issue= |pages= |date=October 2023 |pmid=37845471 |doi=10.1007/s00428-023-03673-9 |url=}}</ref> | ||
*CK7 +ve. | *CK7 +ve. | ||
*[[GATA3]] +ve. | |||
*PAX8 +ve. | |||
*CD117 -ve. | *CD117 -ve. | ||
Revision as of 21:13, 13 November 2023
| Low-grade oncocytic renal tumour | |
|---|---|
| Diagnosis in short | |
 Low-grade renal oncocytic tumour. H&E stain. | |
|
| |
| LM | abundant eosinophilic cytoplasm, nuclei uniform and round without significant pleomorphism, solid or tubular architecture |
| LM DDx | renal oncocytoma, chromophobe renal cell carcinoma eosinophilic variant, clear cell renal cell carcinoma eosinophilic variant, papillary renal cell carcinoma oncocytic variant, tubulocystic carcinoma of the kidney, other renal tumours with eosinophilic cytoplasm, benign liver |
| IHC | CK7 +ve, CD117 -ve, PAX8 +ve, GATA3 +ve |
| Grossing notes | partial nephrectomy grossing, total nephrectomy for tumour grossing |
| Site | kidney - see kidney tumours |
|
| |
| Clinical history | often incidentally discovered mass |
| Prognosis | likely benign |
| Clin. DDx | other kidney tumours |
Low-grade oncocytic renal tumour, abbreviated LOT, is an unusual renal tumour that does not neatly fit into any WHO renal neoplasia category. It is also known as renal oncocytic tumour that is CD117 negative and CK7 positive.
Whether it is a distinct entity is not clear as of 2019.[1] It can be considered an emerging entity that may be in the WHO classification of renal neoplasia in the future.[2]
General
- Very rare.
- Benign behaviour based on a small series.[1]
Microscopic
Features:[3]
- Oncocytic cytoplasm.
- Round nuclei.
- Tubular or solid architecture.
- Edematous areas with loosly arranged cells.
- Low ISUP nucleolar grade - grade 1 or 2.
DDx:
- Renal oncocytoma.
- Chromophobe renal cell carcinoma.
- Renal hybrid oncocytic/chromophobe tumour.
- Renal cell carcinoma, unclassified.
- Renal tumours with eosinophilic cytoplasm.
Images
LGORT - low mag. (WC)
LGORT - intermed. mag. (WC)
LGORT - intermed. mag. (WC)
LGORT - high mag. (WC)
LGORT - high mag. (WC)
LGORT - high mag. (WC)
IHC
Features:[4]
- CK7 +ve.
- GATA3 +ve.
- PAX8 +ve.
- CD117 -ve.
Others:
- CD10 -ve/+ve.
- AMACR -ve/+ve.
- CA9 -ve.
- CK20 -ve.
- CD10 -ve.
Sign out
Right Kidney Mass, Biopsy: - Low-grade oncocytic tumour (see comment). Comment: The tumour stains as follows: POSITIVE: CK7 (strong, diffuse), CD117 (very focal), PAX8 (strong, diffuse), AE1/AE3, AMACR, E-cadherin, BerEP4. NEGATIVE: CD10, CK20, vimentin, CA9. This tumour does not completely fit the diagnosis of renal oncocytoma or eosinophilic chromophobe renal cell carcinoma. It is in keeping with "low-grade oncocytic tumour" (LOT), an evolving entity. Based on limited data, LOT appears to have an indolent behavior.
See also
References
- ↑ 1.0 1.1 Trpkov K, Williamson SR, Gao Y, Martinek P, Cheng L, Sangoi AR, Yilmaz A, Wang C, San Miguel Fraile P, Perez Montiel DM, Bulimbasić S, Rogala J, Hes O (August 2019). "Low-grade oncocytic tumour of kidney (CD117-negative, cytokeratin 7-positive): a distinct entity?". Histopathology 75 (2): 174–184. doi:10.1111/his.13865. PMID 30895640.
- ↑ Siadat F, Trpkov K (January 2020). "ESC, ALK, HOT and LOT: Three Letter Acronyms of Emerging Renal Entities Knocking on the Door of the WHO Classification". Cancers (Basel) 12 (1). doi:10.3390/cancers12010168. PMC 7017067. PMID 31936678. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7017067/.
- ↑ Trpkov K, Williamson S, Martinek P, Cheng L, San Miguel Fraile P, Yilmaz A, Hes O, Oncocytic Renal Tumors with CD117 Negative, Cytokeratin 7 Positive Immunoprofile are Different from Eosinophilic Chromophobe Renal Cell Carcinoma (ChrRCC) and Oncocytoma. United States and Canadian Academy of Pathology Annual Meeting 2018.
- ↑ Ricci C, Ambrosi F, Franceschini T, Giunchi F, Grillini A, Franchini E, Grillini M, Schiavina R, Massari F, Mollica V, Tateo V, Bianchi FM, Bianchi L, Droghetti M, Maloberti T, Tallini G, Colecchia M, Acosta AM, Lobo J, Trpkov K, Fiorentino M, de Biase D (October 2023). "Evaluation of an institutional series of low-grade oncocytic tumor (LOT) of the kidney and review of the mutational landscape of LOT". Virchows Arch. doi:10.1007/s00428-023-03673-9. PMID 37845471.