title: Clear cell type of renal cell carcinoma with numerous hyaline globules: a diagnostic pitfall.
abstract: A unique and never-before-published example of clear cell renal cell carcinoma (CRCC) found among 9000 primary renal cell tumors is presented. The tumor contained such a dense concentration of glassy hyaline globules (GHG) in the cytoplasm of the neoplastic cells that it overshadowed the morphology of the neoplasm. The resulting appearance of the tumor was quite misleading and different from the conventional CRCC. The GHG were 7-30 microm in diameter. They were glassy and pale to slightly eosinophilic in color in hematoxylin-eosin. The GHG stained positively with periodic acid-Schiff and negatively with silver and Hale's colloidal iron. Immunohistochemically, they were also negative for anti Mycobacterium bovis antigen. At the ultrastructural level, the GHG were formed by an amorphous mass of stellate shape. The GHG were localized within rough endoplasmic reticulum. Molecular genetically, mutation of the distal part of exon 3 of the VHL gene causing elongation of the VHL protein was found in the tumor, thus confirming the diagnosis of CRCC.
authors.affiliation: Department of Pathology, University Hospital Plzen, Czech Republic.
authors.forename: Ondrej
authors.initials: O
authors.lastname: Hes
authors.forename: Katarina
authors.initials: K
authors.lastname: Benakova
authors.forename: Tomas
authors.initials: T
authors.lastname: Vanecek
authors.forename: Radek
authors.initials: R
authors.lastname: Sima
authors.forename: Michal
authors.initials: M
authors.lastname: Michal
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002292:Carcinoma, Renal Cell / Q000175:diagnosis* / Q000235:genetics / Q000378:metabolism; D003593:Cytoplasm / Q000378:metabolism / Q000648:ultrastructure; D017931:DNA Primers / Q000737:chemistry; D004273:DNA, Neoplasm / Q000032:analysis; D016368:Frameshift Mutation; D006801:Humans; D006818:Hyalin / Q000378:metabolism* / Q000648:ultrastructure; D007680:Kidney Neoplasms / Q000175:diagnosis* / Q000235:genetics / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D009392:Nephrectomy; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012334:RNA, Neoplasm / Q000032:analysis; D017423:Sequence Analysis, RNA; D013148:Spironolactone / Q000378:metabolism; D016896:Treatment Outcome; D025521:Tumor Suppressor Proteins / Q000235:genetics / Q000378:metabolism; D044767:Ubiquitin-Protein Ligases / Q000235:genetics / Q000378:metabolism; D051794:Von Hippel-Lindau Tumor Suppressor Protein
chemical_list: D017931:DNA Primers; D004273:DNA, Neoplasm; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D025521:Tumor Suppressor Proteins; D013148:Spironolactone; D044767:Ubiquitin-Protein Ligases; D051794:Von Hippel-Lindau Tumor Suppressor Protein; C497446:VHL protein, human