Carmen M Perrino1, David J Grignon1, Sean R Williamson2,3,4, Muhammad T Idrees1, John N Eble1, Liang Cheng1,5. 1. Department of Pathology, Indiana University School of Medicine, Indianapolis, IN, USA. 2. Department of Pathology and Laboratory Medicine, Henry Ford Health System, Detroit, MI, USA. 3. Henry Ford Cancer Institute, Henry Ford Health System, Detroit, MI, USA. 4. Department of Pathology, Wayne State University School of Medicine, Detroit, MI, USA. 5. Department of Urology, Indiana University School of Medicine, Indianapolis, IN, USA.
Abstract
AIMS: Renal cell carcinoma, unclassified (RCCU) is a category that includes a morphologically and biologically heterogeneous group of tumours that are unable to be diagnosed as other well-defined entities. We aim to describe the morphological findings of tumours within this category and to determine the most frequent morphological features leading to classification difficulty. METHODS AND RESULTS: One hundred and thirty-six cases of RCCU were examined. Patients ranged in age from 23 to 87 years. Seventy-seven patients were men and 59 were women. International Society of Urological Pathology (ISUP) grade was most commonly 3 (n = 66), followed by 2 (n = 42) and 4 (n = 28). Tumour size ranged from 0.6 to 24.9 cm. The American Joint Committee on Cancer (AJCC) pathological T categories included pT1a (n = 50), pT1b (n = 14), pT2a (n = 7), pT2b (n = 4), pT3a (n = 50) and pT4 (n = 9). Forty-four cases included lymph node(s), 41% of which (n = 18) had metastases. Tumours were assessed for a variety of histological features and assigned to the following morphological groups: predominantly oncocytoma/chromophobe RCC-like; clear cell RCC-like; papillary RCC-like; collecting duct-like; and pure sarcomatoid differentiation. The majority of the oncocytoma/chromophobe and clear cell RCC-like phenotypes were low stage (pT1 or pT2). The papillary RCC-like, collecting duct-like and pure sarcomatoid phenotypes were mainly high stage (pT3 or pT4). CONCLUSIONS: Renal cell carcinoma, unclassified is a term that encompasses tumours with a variety of morphological features and a wide biological spectrum. The most common source of diagnostic difficulty was tumours composed of predominantly eosinophilic cells.
AIMS: Renal cell carcinoma, unclassified (RCCU) is a category that includes a morphologically and biologically heterogeneous group of tumours that are unable to be diagnosed as other well-defined entities. We aim to describe the morphological findings of tumours within this category and to determine the most frequent morphological features leading to classification difficulty. METHODS AND RESULTS: One hundred and thirty-six cases of RCCU were examined. Patients ranged in age from 23 to 87 years. Seventy-seven patients were men and 59 were women. International Society of Urological Pathology (ISUP) grade was most commonly 3 (n = 66), followed by 2 (n = 42) and 4 (n = 28). Tumour size ranged from 0.6 to 24.9 cm. The American Joint Committee on Cancer (AJCC) pathological T categories included pT1a (n = 50), pT1b (n = 14), pT2a (n = 7), pT2b (n = 4), pT3a (n = 50) and pT4 (n = 9). Forty-four cases included lymph node(s), 41% of which (n = 18) had metastases. Tumours were assessed for a variety of histological features and assigned to the following morphological groups: predominantly oncocytoma/chromophobe RCC-like; clear cell RCC-like; papillary RCC-like; collecting duct-like; and pure sarcomatoid differentiation. The majority of the oncocytoma/chromophobe and clear cell RCC-like phenotypes were low stage (pT1 or pT2). The papillary RCC-like, collecting duct-like and pure sarcomatoid phenotypes were mainly high stage (pT3 or pT4). CONCLUSIONS:Renal cell carcinoma, unclassified is a term that encompasses tumours with a variety of morphological features and a wide biological spectrum. The most common source of diagnostic difficulty was tumours composed of predominantly eosinophilic cells.
Authors: Huiying He; Kiril Trpkov; Petr Martinek; Ozlem Tanas Isikci; Cristina Maggi-Galuzzi; Reza Alaghehbandan; Anthony J Gill; Maria Tretiakova; Jose Ignacio Lopez; Sean R Williamson; Delia Perez Montiel; Maris Sperga; Eva Comperat; Fadi Brimo; Ali Yilmaz; Kristyna Pivovarcikova; Kveta Michalova; David Slouka; Kristyna Prochazkova; Milan Hora; Michael Bonert; Michal Michal; Ondrej Hes Journal: Virchows Arch Date: 2018-09-19 Impact factor: 4.064
Authors: Sofia Canete-Portillo; Maria Del Carmen Rodriguez Pena; Dezhi Wang; Diego F Sanchez; George J Netto; Cristina Magi-Galluzzi Journal: Virchows Arch Date: 2021-10-05 Impact factor: 4.064
Authors: Kiril Trpkov; Sean R Williamson; Anthony J Gill; Ondrej Hes; Adebowale J Adeniran; Abbas Agaimy; Reza Alaghehbandan; Mahul B Amin; Pedram Argani; Ying-Bei Chen; Liang Cheng; Jonathan I Epstein; John C Cheville; Eva Comperat; Isabela Werneck da Cunha; Jennifer B Gordetsky; Sounak Gupta; Huiying He; Michelle S Hirsch; Peter A Humphrey; Payal Kapur; Fumiyoshi Kojima; Jose I Lopez; Fiona Maclean; Cristina Magi-Galluzzi; Jesse K McKenney; Rohit Mehra; Santosh Menon; George J Netto; Christopher G Przybycin; Priya Rao; Qiu Rao; Victor E Reuter; Rola M Saleeb; Rajal B Shah; Steven C Smith; Satish Tickoo; Maria S Tretiakova; Lawrence True; Virginie Verkarre; Sara E Wobker; Ming Zhou Journal: Mod Pathol Date: 2021-02-01 Impact factor: 7.842