title: Impact of liver biopsy size on histological evaluation of chronic viral hepatitis: the smaller the sample, the milder the disease.
abstract: OBJECTIVE
  In chronic viral hepatitis, liver biopsy is performed for assessing disease activity and fibrosis. In this study, we evaluated the impact of the size of liver biopsy on the grading and staging.
  
  
  METHODS
  We selected 161 liver biopsies from patients with chronic types B and C hepatitis on the basis of their length (> or =3 cm) and width (1.4 mm). Ishak scoring system was used for grading and staging. The score was blindly repeated reducing the length of the specimen from > or =3 to 1.5 cm and to 1 cm long and width from 1.4 to 1 mm.
  
  
  RESULTS
  Reducing the length of the biopsy led to an increase of cases with mild grades: 49.7% in > or =3 cm, 60.2% in 1.5 cm and 86.6% in 1 cm long specimens (P<0.001). Similarly, cases staged as having mild fibrosis significantly increased in the shorter specimens: 59% in > or =3 cm, 68.3% in 1.5 cm and 80.1% in 1 cm long specimens (P<0.001). As for the width, both grade and stage were significantly underscored in the 1 mm samples, regardless of their length.
  
  
  CONCLUSIONS
  Liver biopsy size strongly influences the grading and staging of chronic viral hepatitis. The use of fine needles should be discouraged in this setting.
authors.affiliation: Liver Unit, Seriate Hospital, Bergamo, Italy. mguido@unipd.it
authors.forename: Guido
authors.initials: G
authors.lastname: Colloredo
authors.forename: Maria
authors.initials: M
authors.lastname: Guido
authors.forename: Aurelio
authors.initials: A
authors.lastname: Sonzogni
authors.forename: Gioacchino
authors.initials: G
authors.lastname: Leandro
mesh_terms: D001707:Biopsy, Needle / Q000379:methods / Q000592:standards*; D019694:Hepatitis B, Chronic / Q000473:pathology*; D019698:Hepatitis C, Chronic / Q000473:pathology*; D006801:Humans; D008099:Liver / Q000473:pathology*; D010338:Pathology, Clinical / Q000379:methods / Q000592:standards; D015203:Reproducibility of Results; D012720:Severity of Illness Index