Accuracy of the smear technique in the cytological diagnosis of 650 lesions of the central nervous system

The authors analyzed the results of 650 lesions of the central nervous syst em submitted to intraoperative cytological diagnosis by the smear technique . Cytological and paraffin section diagnosis were compared. The following s tatistical values were obtained: accuracy of 97.3%, sensitivity of 97.9%, s pecificity of 95%, positive predictive value of 99.1%, and negative predict ive value of 89.6%. The authors comment on their main pitfalls using this c ytological diagnostic procedure. (C) 2001 Wiley-Liss, Inc.