Table 1.

Diagnostic categories recommended by European guidelines.

Diagnostic category	Results	Significance
C1	Inadequate/non-representative	Nonoptimal for diagnosis/number of epithelial cells too low
C2	Benign	Aspirate adequate for diagnosis and with benign features
C3	Atypia in a lesion that is probably benign	Aspirate adequate for diagnosis and with benign features couple with some cellular atypia
C4	Suspected malignancy or probable carcinoma	Aspirate that is suggestive of malignancy without being definitively diagnostic
C5	Malignant carcinoma or other malignant tumor	Aspirate containing cells with features of carcinoma or other malignant tumors