Combined use of histopathology with touch smear cytology in biopsies of the larynx.

The aim of this prospective study is to evaluate the effectiveness of combined use of histopathology with cytology in biopsies of the larynx. Biopsies taken for this purpose are studied by using two different methods and the results are evaluated. One hundred and thirty-five patients with suspected malignant laryngeal lesions were examined by direct microlaryngoscopy for primary diagnosis. Each lesion was biopsied first. Subsequently touch smear cytology was obtained from the biopsies. In all cases, cytologic slides (one or two per biopsy) were screened and compared to corresponding biopsies. Lesions were categorized as benign, laryngeal intraepithelial neoplasia and malignant. Results obtained were compared with surgical samples obtained from patients who have undergone surgery. In other cases, where surgery was not applied, results of the follow-up were evaluated. In larynx biopsies the results for histopathology were as follows: sensitivity 93.9%, specificity 100% and accuracy 96.3%. The results for cytology were as follows: sensitivity 82.5%, specificity 94.5% and accuracy 87.4%. A comparison of cytologic evaluation versus histopathologic evaluation in laryngeal biopsies reveals that histopathology is superior. According to the study results, in 88.9% (120/135) of the cases the agreement between cytological and histopathological results was found. In two other cases (1.5%) cytologic evaluation contributed to the histopathologic diagnosis.