<prompt> Which of the following features on mammogram would suggest malignancy?Well defined lesionA mass of decreased densityAreas of spiculated microcalcificationsSmooth borders  <response>: Ans. is c i.e. Areas of spiculated microcalcifications Distinguishing features between benign and malignant lesions on mammogram:- BenignMalignantOpacitySmooth marginIII defined margin, Irregular stellate, spiculated margin, comet tail Low densityHigh density HomogeneousIn homogeneous Thin halowide haloCalcificationMacrocalcification 5mm inMicrocalcification 5 mm in diameterdiameterBreast ParenchymaNormalArchitectural distortionNippleareola- Retracted- RetractedSkinNormalthickenedCooper ligamentsNormalthickened, increase numberDuctsNormalfocal dilatationSubcutaneous retro mammary spaceNormalobliterated 