title: Nucleolar organizer regions in normal skeletal muscle and benign and malignant rhabdomyoblastic tumors.
abstract: The silver staining of interphase nucleolar organizer regions (NORs) has been shown to have an important application in diagnostic histopathology for distinguishing some benign from malignant conditions. In this study, normal fetal and adult skeletal muscles and tissue from fetal and adult rhabdomyomas as well as rhabdomyosarcomas were stained with the silver method for NORs. The morphologic distribution of NORs in rhabdomyosarcomas was found to be very different from that in normal skeletal muscles. In addition, cases of rhabdomyoma were easily differentiated from rhabdomyosarcomas. Statistical analysis of data, from all cases, regarding the diameter of NORs and number per nucleus confirmed these observations.
authors.affiliation: Istituto Anatomia ed Istologia Patologica, Università degli Studi di Bologna.
authors.forename: V
authors.initials: V
authors.lastname: Eusebi
authors.forename: C
authors.initials: C
authors.lastname: Ceccarelli
authors.forename: A
authors.initials: A
authors.lastname: Cancellieri
authors.forename: M
authors.initials: M
authors.lastname: Derenzini
mesh_terms: D000293:Adolescent; D000328:Adult; D002466:Cell Nucleolus / Q000648:ultrastructure*; D002648:Child; D002675:Child, Preschool; D003937:Diagnosis, Differential; D005333:Fetus / Q000648:ultrastructure; D006801:Humans; D008875:Middle Aged; D009132:Muscles / Q000648:ultrastructure*; D012207:Rhabdomyoma / Q000648:ultrastructure*; D012208:Rhabdomyosarcoma / Q000648:ultrastructure*