Write a short note on Paget's Disease of the Nipple.

The Concept

Paget's disease of the nipple is an eczema-like change of the nipple that is actually a manifestation of an underlying breast cancer. This is the crucial idea: although it looks like a simple skin rash, it is caused by malignant ductal cells (Paget cells) migrating along the ducts to reach and infiltrate the epidermis of the nipple. Almost all cases have an underlying carcinoma — either DCIS or an invasive cancer — so Paget's disease is never treated as a skin problem alone.

Clinical Features & the Key Distinction

It presents as a persistent, red, scaly, itchy or weeping, eczema-like lesion that begins on the nipple and spreads to the areola, sometimes with ulceration or nipple destruction. The high-yield distinction from simple nipple eczema is anatomical: Paget's disease starts on the nipple and spreads to the areola, whereas eczema starts on the areola and spares the nipple. Any unilateral, persistent nipple lesion that fails to respond to topical treatment must raise suspicion.

Investigation & Management

A nipple (punch) biopsy confirms the diagnosis by showing Paget cells, and full triple assessment (including mammography) searches for the underlying tumour, which may be non-palpable. Treatment is that of the underlying cancer — usually surgery (mastectomy, or breast-conserving surgery removing the nipple-areolar complex) with radiotherapy, plus axillary staging and adjuvant therapy as dictated by the tumour.

WHY It Matters Clinically

Paget's disease is important precisely because it is easy to dismiss. A busy clinician may treat a red, scaly nipple as dermatitis with steroid cream; the lesion may even partially improve, giving false reassurance, while the underlying cancer progresses. The safeguard is a firm rule: any unilateral, persistent nipple lesion that does not resolve promptly with simple treatment is biopsied. Around half of patients also have a palpable underlying mass, which usually indicates an invasive cancer and a correspondingly more guarded prognosis.

Exam Pointer

For the viva, anchor the answer on the single defining idea and its safe rule: state the mechanism, the classic clinical picture, the mandatory role of triple assessment where a lump or discharge is involved, and the specific management — and be ready to contrast the condition with the malignancy it can mimic, since that contrast is what examiners most often probe.

Management & Prognostic Implication

Because Paget's disease signifies an underlying cancer, treatment is that of the tumour — surgery (mastectomy, or breast-conserving surgery that removes the nipple-areolar complex) with radiotherapy, plus axillary staging and adjuvant therapy as dictated by the invasive component. The presence of a palpable mass (in about half of cases) usually indicates an invasive cancer with a correspondingly more guarded prognosis, whereas Paget's disease with only DCIS behind it does very well. The prognosis therefore depends on what lies beneath the nipple change, not on the skin lesion itself.

Unlike eczema, it starts at the nipple and destroys it.

• Paget's disease = eczema-like nipple change that signifies an underlying breast carcinoma (DCIS or invasive).
• Malignant ductal (Paget) cells migrate to the nipple epidermis.
• Red, scaly, weeping lesion starting on the nipple and spreading to areola; eczema does the opposite (areola, spares nipple, bilateral).
• Confirm by nipple biopsy + full triple assessment for the underlying tumour.
• Treat the underlying cancer (surgery ± radiotherapy, axillary staging); never manage as simple eczema.