Difference between revisions of "Low-grade oncocytic renal tumour"

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| Image      = Low grade oncocytic renal tumour - alt -- intermed mag.jpg
| Image      = Low grade oncocytic renal tumour -- very high mag.jpg
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| Caption    = Low-grade renal oncocytic tumour. [[H&E stain]].
| Caption    = Low-grade renal oncocytic tumour. [[H&E stain]].

Revision as of 03:06, 7 April 2021

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
Stains Hale's colloidal iron -ve
IHC CK7 +ve, CD117 -ve, PAX8 +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, 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:

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:

  • CK7 +ve.
  • CD117 -ve.

Others:

  • CD10 -ve/+ve.
  • AMACR -ve/+ve.
  • CA9 -ve.
  • CK20 -ve.
  • CD10 -ve.

See also

References

  1. ↑ 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.
  2. ↑ 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/.
  3. ↑ 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.
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