*_🔹TYPES OF BREAST CANCER_* *_(a)DUCTAL CARCINOMA IN SITU(DCIS)_* ▪️It is characterized by the proliferation(rapid growth) of malignant(cancerous) cells inside the milk ducts without invasion of the surrounding tissues. ▪️This can be clearly visualized on a mammogram with the appearance of calcifications,and considered breast cancer stage 0. ▪️If untreated,it has a likelihood of progressing to invasive cancer. *_(b)INVASIVE CANCER_* ▪️This one invades the surrounding tissues. *_(I)INFILTRATING DUCTAL CARCINOMA_* ▪️Accounts for 80% of all cases. ▪️Tumors arise from the duct system and invade the surrounding tissue. ▪️They often form a solid irregular mass in the breast. *_(II)INFILTRATING LOBULAR CARCINOMA_* ▪️Accounts for 10-15% of breast cancer. ▪️Tumors arise from the lobular epithelium and typically occur as an area of ill-defined thickening in the breast. *_(III)MEDULARY CARCINOMA_* ▪️Accounts for about 5% of breast cancer. ▪️Often diagnosed in women younger than 50 years of age. ▪️Tumors grow in a capsule inside a duct. ▪️They can become large. *_(IV)MUCINOUS CARCINOMA_* ▪️Accounts about 3% of breast cancer. ▪️Often presents in post menopausal women 75 years of age and older. ▪️Tumor is slow growing,prognosis is more favorable than in many other types. *_(V)TUBULAR DUCTAL CARCINOMA_* ▪️Accounts for 2% of breast cancer. ▪️Axillary metastasis is uncommon with this histology. ▪️Prognosis is usually excellent.