الفهرس 
List of contentsOnly 14 pages are availabe for public view
 |  | from | 3 |  |  |
| | | from | 3 | | |
Abstract
Ductal carcinoma in situ (DCIS), represents spectrum of non invasive breast cancers composed of malignant epithelial cells still surrounded by the normal basement membrane of the duct. Before use of wide spread mammographic screening, DCIS was rarely detected and accounted for only (0.8-5%) of all breast cancers.In recent years, DCIS has been encountered more frequently because of the wide spread use of mammographic screening in asymptomatic women. DCIS account for as much as 30% of breast cancers in screened populations and approximately 5% of breast carcinoma in symptomatic women .The mammographic features of DCIS have been well described in the literature, with microcalcifications being the dominant feature, other finding such as masses, architectural distortions, dilated retroareolar ducts and developing densities have also been reported. Although most cases of DCIS are diagnosed mammographically, 6-23% of DCIS are not seen visible on mammography .Several studies have examined the role of sonography in evaluation of mammographically detected microcalcification and the sonographic finding of DCIS.A microlobulated mass with mild hypoechogenicity, ductal extension and normal acoustic transmission are the most US finding in DCIS, but speculated margins marked hypoechogenicity, thick echogenic rim and posterior acoustic shadowing at US often suggested the presence of invasion .In recent studies, MRI imaging has demonstrated high sensitivity for DCIS, helping detected mammographically and clinically occult DCIS in numerous reported cases.MRI showed higher sensitivity than did mammography for all tumor types, and higher sensitivity than did US for DCIS.