Biphasic hyalinizing psammomatous renal cell carcinoma

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Biphasic hyalinizing psammomatous renal cell carcinoma, abbreviated BHP RCC, is a rare type of renal cell carcinoma with mutations in neurofibromin 2.[1]

It is not recognized as a subtype of RCC by the WHO of 2022.[2]

General

  • Evolving entity.
  • Very rare.
  • Prevalence: male > female.

Microscopic

Features:[1]

  • Biphasic cytomorphology:
    1. Small cells.
    2. Large cells.
  • Hyaline stroma.
  • Psammoma bodies.

DDx:

IHC

Features:[1]

  • HNF-1beta +ve
  • PAX8 +ve
  • CK7 +ve
  • EMA +ve.
  • AMACR +ve.
  • WT1 -ve
  • Melan A -ve.
  • HMB-45 -ve.
  • GATA3 -ve.
  • Chromogranin A -ve.
  • Synaptophysin -ve.
  • FH normal.
  • SDHB normal.

Others:

  • Merlin - loss of staining (12 of 13 cases[2]).

Molecular

  • Neurofibromin 2 (NF2) gene mutations.[2]

See also

References

  1. ↑ 1.0 1.1 1.2 Argani P, Reuter VE, Eble JN, Vlatkovic L, Yaskiv O, Swanson D, Dickson BC, Antonescu CR, Matoso A, Gagan J, Palsgrove DN (July 2020). "Biphasic Hyalinizing Psammomatous Renal Cell Carcinoma (BHP RCC): A Distinctive Neoplasm Associated With Somatic NF2 Mutations". Am J Surg Pathol 44 (7): 901–916. doi:10.1097/PAS.0000000000001467. PMC 7350624. PMID 32217839. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7350624/.
  2. ↑ 2.0 2.1 2.2 Collins K, Hwang M, Antic T, Paintal A, Argani P, Matoso A, Gopinath A, Baskovich B, Mehra R, Williamson SR, Idrees MT, Barletta JA, Anderson WJ, Hirsch MS, Hornick JL, Acosta AM (November 2022). "Merlin immunohistochemistry is useful in diagnosis of tumours within the spectrum of biphasic hyalinizing psammomatous renal cell carcinoma". Histopathology 81 (5): 577–586. doi:10.1111/his.14731. PMID 35971742.
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