Post-mastectomy lymphatic complications

1. Seroma and lymphocele (early)

• Mechanism: Mastectomy and axillary dissection disrupt blood and lymphatic vessels. This causes an inflammatory response with increased vascular permeability, and serous fluid collects in the dissected space. This mechanism comes from the textbook's general seroma section, which is written around hernia repair. It applies equally to flap dissection.
• Presentation: Fullness or prominence at the surgical site. If left untreated, the seroma stops the skin flap from adhering to the chest wall.
• Consequences: Infection, flap problems, wound dehiscence, and delayed adjuvant therapy.
• Prevention: Closed-suction drains are placed to evacuate fluid. They stay in until output is below 30 mL per 24 hours, because seroma and lymphocele rates relate directly to the volume draining at removal. Sutures and tissue sealants have not removed the need for drains.
• Treatment: Needle aspiration, or a small catheter at the most dependent margin of the cavity. Rarely, surgery is needed.

2. Breast cancer-related lymphedema (BCRL, chronic)

• Mechanism: Axillary clearance or mastectomy damages upper limb lymphatic drainage. Axillary radiotherapy also destroys the tiny lymphatics. The arm swells and develops pitting edema. (Gray's Anatomy for Students, "Breast cancer")
• Incidence: A large systematic review found about 21% of treated patients develop BCRL. This may be an underestimate because BCRL can occur without arm swelling. There are no universally accepted diagnostic criteria. (Sabiston Textbook of Surgery, p. 2428-2429, Upper Extremity Lymphedema)
• Symptoms: Pain, heaviness, tightness, and reduced range of motion that affects fine motor skills. Anxiety, depression, and distress are common.
• Risk factors:
  • Axillary dissection with many nodes removed
  • Mastectomy
  • Higher BMI
  • More metastatic nodes
  • Radiation
  • Physical inactivity
• Surgical options: Lymphatic grafting with thigh lymphatics, or connecting affected arm lymphatics to neck or chest lymphatics, nodes, or veins. The textbook calls lymphatic surgery an emerging field aimed at preventing and treating lymphedema. (Sabiston, Lymphatic Surgery)
• Prevention: Fischer's notes that axillary reverse lymphatic mapping and lymphovenous anastomosis are being used to prevent arm lymphedema when axillary dissection is planned.

3. Other points from the library

• Axillary web syndrome (cording) is a recognized complication. My searches did not return a library passage on it, so this is from general knowledge.
• Nerve injury is possible. The intercostobrachial, long thoracic, thoracodorsal, and medial and lateral pectoral nerves are at risk. (Fischer's, p. 1617)
• Related non-lymphatic complications are hematoma (the most common cause of reoperation, 1.9%), infection (1-20%), and flap necrosis.

4. Practical management (general clinical knowledge, not from the retrieved passages)

• Educate patients early and consider baseline arm measurements or bioimpedance.
• Treat established lymphedema with complex decongestive therapy: manual lymphatic drainage, compression bandaging and garments, exercise, and skin care.
• Treat cellulitis promptly, since it can worsen lymphedema.
• Refer for surgical options such as lymphovenous bypass or vascularized lymph node transfer if conservative therapy fails.

Recent evidence check

• A 2026 systematic review and network meta-analysis of immediate versus delayed lymphatic reconstruction for BCRL (PMID 41672023).
• A 2025 meta-analysis of breast reconstruction versus no reconstruction and BCRL (PMID 40953534).
• A 2026 meta-analysis on lymphedema care, including exercise and manual lymphatic drainage (PMID 41999182).