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. 2006 Jun 6;95(1):62–66. doi: 10.1038/sj.bjc.6603211

Table 1. Reporting categories for FNAC and for CB.

  Cytology reporting   Core biopsy reporting
C1 Unsatisfactory B1 Unsatisfactory/normal tissue only
C2 Benign B2 Benign
C3 Atypia probably benign B3 Benign, but of uncertain malignant potential
C4 Suspicious of malignancy B4 Suspicious of malignancy
C5 Malignant B5 Malignant
       B5a Noninvasive cancer
       B5b Invasive cancer
       B5c Cancer of nonassessable invasiveness

CB=core biopsy; FNAC=fine-needle aspiration cytology.