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Background: Nipple discharge causes discomfort and anxiety to many women. Nipple discharge is most commonly associated with endocrine alterations and/or medications. These often result in duct ectasia and/or fibrocystic changes that may lead to discharge from one or several ducts. The most common cause of clinically significant discharge is intraductal growth of the ductal epithelium, due to hyperplasia, micropapillary proliferation, solitary papillomas and/or ductal carcinoma (both in situ and invasive). The aim of the study was to evaluate the role of the gray-scale ultrasound and colour Doppler in the diagnosis of intraductal pathology in patients with nipple discharge.
Patients And Methods: One hundred & seven patients were included in the study, (age range 23-65years). Standard mammographic views were taken. Ultrasound evaluation was performed for all cases; ductography for 20 cases and ductoscopy for 3 cases. US guided fine needle biopsy was done in 7 cases; microducectomy of affected duct was done in 20 cases and major duct excision in 5cases. Fibro-optic Ductoscopy is performed for 3 cases.
Results: Revision of biopsy specimens of 17 cases with intraluminal masses detected by US revealed: Six cases with intraductal carcinoma, intraductal papilloma in 7 cases, 1 case of ductal papillomatosis. Three cases showed atypical cells: Intraductal papilloma with atypia in 2 cases, proliferative hyperplasia with atypia in one case. Eighty eight cases had simple duct ectasia (51 bilateral multiple and 37 focal duct ectasia). No dilated ducts were detected in 2 cases. Fibro-optic Ductoscopy confirmed the presence of intraductal papilloma in one case, carcinoma in one case, no intraductal masses in the third case. A 6 months follow-up was requested for all cases with no detected intra luminal pathology. Ultrasound examination is highly sensitive (100%) but less specific (82.4%) in diagnosis of intraductal pathology. Colour & power Doppler are sensitive (94%) in detecting flow in intraductal echogenic masses to differentiate them from insipissated secretions. Colour and power Doppler raises specificity and diagnostic accuracy to 100%. Ductography is an underused procedure that is sensitive (100%) but less specific (60%) in characterization of intraductal filling defects.
Conclusion: Ultrasonography is a mandatory complement to mammography in these cases, US guided fine needle biopsy is minimally invasive technique in confirming the diagnosis of suspicious mass. Ultrasound may also be a guide to fibro-optic ductoscope.
