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  • Title: [Values and limits in fine needle aspiration in the diagnosis of Warthin tumour of the parotid gland].
    Author: Righi A, Foschini MP.
    Journal: Pathologica; 2006 Dec; 98(6):635-9. PubMed ID: 17285840.
    Abstract:
    UNLABELLED: Recent paper state that cytological diagnosis of Warthin Tumour of the parotid gland is poorly reproducible and that aspiration procedures damage the tumoral tissue as to make difficult the histological diagnosis. Aim of the present study is to review cytological sampling performed with fine needle sampling without aspiration and to compare them with the relative surgical specimens in order to determine the value of fine needle aspiration in the diagnosis of Warthin Tumour and to quantify' the damage in histological tissue. MATERIALS AND METHOD: All cases with cytological and/or histological diagnosis of Warthin Tumour during the period 1/1/98 to 30/6/04 were retrieved. In all cases both cytological and histological slides were reviewed and compared. In all cases fine needle aspiration (FNA) was performed according to the technique described by Zajdela et al. in 1987. A cytologic sample was considered diagnostic when there were in the same sample mucoid substance, lymphocytes scattered with a range of maturation and oncocytes organized in flat sheets of cells. RESULTS: 38 cases were selected corresponding to 37 patients (1 case of Warthin Tumour bilateral): all tumors were localized in the parotid gland. Fine needle sampling were 43. Nine cytological sample (20.9%) were inadequate. Sensitivity and specificity, in the preent series, had the same value, being 97.1%. A spectrum of histologic alterations were observed in 30/38 cases (79%). These alterations were squamous metaplasia (7 cases), acute and chronic hemorrhage and inflammation with multinucleated giant cells (26 cases) and granulation tissue with subsequent fibrosis (24 cases). In all cases the histologic alterations from fine needle were focal, limited to less than 20% of the tumoral area (first category of Batsakis 'classification), and did not prevent the histologic diagnosis of Warthin Tumour. CONCLUSIONS: These data suggest that fine needle aspiration without aspiration is a valuable tool for the per-operative diagnosis of Warthin Tumour. In addition it creates only minor histological changes, that always allow the histological diagnosis.
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