Fine needle aspiration cytology of a low grade myxoid renal epithelial neoplasm: a case report.
BACKGROUND
Recently, several case reports have described a rare but distinct subtype of renal tumor, referred to as a "low grade renal epithelial neoplasm," that appears to have a better prognosis than conventional renal cell carcinoma does. This report describes the cytologic features of this tumor as determined by fine needle aspiration (FNA) biopsy.


METHODS
A 53-year-old woman with a history of lymphoma had a renal mass incidentally discovered on an abdominal computed tomographic scan performed for lymphoma restaging. Results of an FNA biopsy showed relatively uniform, medium-sized tumor cells with moderate amounts of finely vacuolated or wispy cytoplasm and indistinct cell borders. The nuclei were primarily round with coarse chromatin and had prominent nucleoli. In the cell block preparation, the tumor cells showed a tubular architecture and an abundant myxoid matrix. The patient underwent a partial nephrectomy. The tumor was classified as a low grade myxoid renal epithelial tumor.


CONCLUSIONS
This unusual kidney tumor appears to have distinctive cytomorphologic features, including a uniform population of epithelial cells with round nuclei, an abundant myxoid matrix and tubular architecture.
Sun
Wei
W
Department of Pathology, The University of Texas M D Anderson Cancer Center, Houston 77030, USA.
McGregor
David K
DK
Ordonez
Nelson G
NG
Ayala
Alberto G
AG
Caraway
Nancy P
NP
D044963:Biopsy, Fine-Needle; D002277:Carcinoma / Q000145:classification / Q000000981:diagnostic imaging / Q000473:pathology*; D002467:Cell Nucleus / Q000473:pathology / Q000648:ultrastructure; D004847:Epithelial Cells / Q000473:pathology* / Q000648:ultrastructure; D005260:Female; D006801:Humans; D007633:Keratins / Q000378:metabolism; D007668:Kidney / Q000000981:diagnostic imaging / Q000473:pathology*; D007680:Kidney Neoplasms / Q000145:classification / Q000000981:diagnostic imaging / Q000473:pathology*; D016256:Lewis X Antigen / Q000378:metabolism; D046529:Microscopy, Electron, Transmission; D008871:Microvilli / Q000473:pathology / Q000648:ultrastructure; D008875:Middle Aged; D009392:Nephrectomy; D011379:Prognosis; D014057:Tomography, X-Ray Computed; D014746:Vimentin / Q000378:metabolism
D016256:Lewis X Antigen; D014746:Vimentin; D007633:Keratins