🩺 Breast Health & Cancer — High-Yield Study Guide (RN prep)

1) Classifications & Key Types

• DCIS: In-duct only, noninvasive.
• IDC: Most common (≈80–90%), past duct; firm ± fixed.
• ILC: ≈10%; often thickening vs discrete lump.
• IBC: Aggressive red-swollen breast, peau d’orange; urgent eval.
• Paget dz (nipple): Erythema, flaking, burning, discharge, pain (late); often linked to intraductal CA.
• Triple-Negative (ER-/PR-/HER2-): 10–20%; more in younger & Black pts; faster course.

2) Common Benign

• Fibrocysti ...