IntroductionBreast lump is one of the commonest presentations of breast diseases. The diagnosis of breast diseases can be achieved like in other clinical conditions using: history, physical examination and investigation which include cytological or histological confirmation. Currently, several studies have advocated the use of 'Triple test' which consists of clinical examination, radiologic examination and cytopathology as more accurate means of making diagnosis of breast lesions (1-5). When all the three components are positive, diagnostic accuracy approaches 100% for malignancy (2). Fine Needle Aspiration cytology (FNAC) is widely used and accepted as a reliable method of making initial pre-operative diagnosis in breast diseases (2, 6). It has been credited with a lot of advantages such as: high accuracy, cheap, fast, out-patient procedure reducing pressure on theatre load, high patient acceptability, and low complication rate (2, 6).Fine Needle Aspiration cytology reports are classified into 5 categories based on the National Health Services Breast Screening Programme (NHSB-SP) of Britain (7). The use of these standardized diagnostic categories is necessary to enhance communication within a multi-disciplinary team and for comparing results from other Centres. The diagnostic categories and their corresponding numerical codes are: Inadequate/insufficient (C1); Benign (C2); Atypical/indeterminate (C3); Suspicious of malignancy (C4) and Malignant (C5). However, Specimen from FNAC can be used to sub-classify breast lesions (7-9). Most studies on FNAC do not make attempt at sub-classifying breast lesions into definite disease types because of the challenges usually encountered (8, 9). The aim of this study is to evaluate the accuracy of sub-classification of breast diseases using FNAC in our Centre. Eur J Breast Health 2017; 13: 194-9 DOI: 10.5152/ejbh.2017.3506 194 ABSTRACT Objective: The aim of this study is to evaluate the accuracy of sub-classification of breast diseases using Fine Needle Aspiration cytology (FNAC).
Materials and methods:A one-year prospective study of 180 consecutive patients with palpable breast lesions who underwent FNAC and subsequently open surgical biopsy for histological confirmation. FNAC was used to sub-classify breast lesions and then correlated with histological diagnosis.Results: A total of 180 patients were enrolled into the study but only 110 patients with histology report were used for test validity. Seventeen (15.5%) smears were C1; while 46 (41.8%), 5 (4.5%), 4 (3.6%) and 38 (34.6%) were C2, C3, C4 and C5, respectively. FNAC achieved sensitivity of 90.0%, specificity of 95.5%, false positive rate of 5.3%, false negative rate of 8.7%, positive predictive value of 94.7%, negative predictive value of 91.3% and overall diagnostic accuracy of 92.9%. Only 86 (78.2%) of the 110 smears could be sub-classified into different disease conditions of the breast on cytology. FNAC accurately sub-classified 25(78.1%) of fibroadenoma and 28(87.5%) of invasive ductal carcinoma.
Conclusion:F...