Fine needle aspiration cytology of nodular thyroid lesions: a 2-year experience of the Bethesda system for reporting thyroid cytopathology in a large regional and a university hospital, with histological correlation.

OBJECTIVE: Thyroid fine needle aspiration (FNA) contributes to the appropriate management of nodular thyroid lesions. The introduced categories in the Bethesda system for reporting thyroid cytopathology (TBSRTC) are associated with an implied cancer risk, providing a clinical management guideline. This study aims to evaluate the reproducibility of this implied risk and to compare the results from two different cytopathology departments. METHODS: Five hundred histologically confirmed FNAs, studied since the introduction of TBSRTC, were obtained from 4208 and 3587 FNAs performed in a large regional hospital in Herakleion, Crete (group A) and a university hospital in Athens (group B), respectively. Reports were issued according to TBSRTC. Aspirates were prepared with ThinPrep(®) and evaluated by two experienced cytopathologists. The reproducibility and accuracy were evaluated. RESULTS: The proportion test for suspicious for malignancy (SFM) and malignant (M) cytology reports (P < 0.0001), and the number of malignancies on histology (P < 0.0001), were significantly higher in group A than in group B, consistent with a higher incidence of thyroid carcinomas in southern Greece. Although the malignancy rates were higher in group A than in group B for all categories, except M (A, 99.3%; B, 100%), the difference was only significant for benign aspirates (P = 0.0303). Malignancy rates for all categories in group A were above the TBSRTC recommended range, but were consistent with an increased prevalence of malignancy in that centre, differences in reporting practice and the variable ranges reported in the literature. There was lower sensitivity (P = 0.019) and overall accuracy (P = 0.003) in group A relative to group B, but no difference in specificity. CONCLUSIONS: TBSRTC provides valuable information for the appropriate management of nodular thyroid lesions, both in a university and a large regional hospital.

Efficacy of 'two-man' FNAB technique in the assessment of patients with non-thyroid neck masses.

OBJECTIVE: To show the superiority of 'two-man' FNAB technique comparing to the standard FNAB technique, in order to identify the cause of non-thyroid neck masses. METHODS: Over an 18 months period, a consecutive paired study was conducted in the tertiary referral Venizelion General Hospital. Forty-four cytologic examinations were performed in patients with non-thyroid head and neck masses. The samples were taken from the same side using both techniques the standard FNAB technique and the 'two-man' FNAB technique (for which two persons carried out the procedure). The slides were seen by the pathologist and were defined as diagnostic, suggestive or inconclusive. The diagnosis was confirmed in any case by definite histology after surgical treatment or open biopsy. RESULTS: From 44 samples taken with the 'two-man' technique, 34 were diagnostic (all true) verified by histopathology, seven suggestive (five true and two false) and three inconclusive (6.82%). The correct diagnosis was confirmed in 39 cases (88.64%). From 44 samples of standard technique, 22 were diagnostic (all true), 12 suggestive (five true and seven false) and 10 inconclusive (22.72%). The correct diagnosis was confirmed in 27 cases (61.36%). The accuracy of diagnosis with the standard FNAB technique was 0.79 (SE=0.07), while with the 'two-man' FNAB technique was 0.95 (SE=0.03), a significant statistical difference (Fischer exact test, P=0.041). CONCLUSIONS: 'Two-man' FNAB technique proved to be as safe and patient friendly as the standard FNAB, but more accurate and may be easier to perform than this. The 'two-man' FNAB technique could become the preferred method for fine-needle cytology, particularly for difficult to reach areas of the head and neck.