Axillary DissectionMedical editor Ellen Schlichting MD
Oslo University Hospital
In women with large tumors or with known metastasis to lymph nodes, a routine axillary dissection (AD) is performed without previous sentinel lymph node biopsy (SNB).
By AD, preferably a minimum of 10 lymph nodes are removed. The operation is most often performed together with breast conservative surgery or mastectomy.
- Part of the primary treatment if known lymph node metastases (pre-, per-, or postoperative).
- In the event the sentinel lymph node is not located during operation for invasive cancer.
Special conditions for breast conservative surgery (BCT)
There is no indication for AD for focus of metastasis ≤ 2 mm. AD is indicated when focus of metastasis is > 2mm, but may be omitted, when there are 1 or 2 positive sentinel nodes and if all the following criteria are met:
- Planned systemic adjuvant treatment
- T1/T2 tumor
- Clinical node-negative axilla
- Planned BCT with external radiation treatment of the breast
- No perinodal growth
- No preoperative chemotherapy
Patients with macroscopic tumor infiltration in the SN will anyway receive radiation therapy to regional lymph node stations (axilla, periclavicular area) in addition to the breast. The current criteria for radiation therapy of pN + status are used to evaluate the treatment of these patients. This means that the axillary level 1-2 also is included in the radiation field as <10 axillary lymph nodes are removed.
Locally advanced breast cancer
Most studies show that patients with locally advanced cancer including clinical N0 status in the axilla (US examination included) before start of preoperative systemic treatment may have SN diagnostics after preoperative chemotherapy with satisfactory detection rate and false negative results. For primary clinical N0 stage it is therefore recommended SN subsequent to neoadjuvant treatment if the conditions otherwise permit this. For SN negativity AD is not necessary. For SN positivity (<2mm) AD should be performed. For clinical N1-3 before neoadjuvant treatment there is still indication for AD without SNB, irrespective of tumor response. For T3/4 tumors locoregional irradiation should be performed irrespective of N status and AD. Thereby the axillary treatment wil be adequate even if there is a false negative SNB.
If the frozen section is false negative, but later investigation shows metastasis, AD should be performed later according to previous schedule mentiones above. Imprint can also be performed as a snap diagnostic.
Immunohistochemical examination of SN is not indicated (98). In some centres this is performed on frozen sections ,especially with regard to metastases from lobular carcinoma.
For parasternal uptake on scintigraphy AD should be performed first. The literature is ambiguous with regard to the indication for possible removal of parasternal SN. The major gain will be in the very few cases where positive parasternal lymph nodes will lead to other and more extensive adjuvant treatment as when the SN in the axilla is negative. There is no suggestion that removal of parasternal lymph nodes will influence the rate of recurrence.
- Remove lymph node metastases to cure the disease.
- The hair of the axilla is removed using a shaving machine.
- The operation is performed under general anesthesia.
- The patient in a supine position with the ipsilateral arm abducted 70-90°.
- The incision is made across the lower part of the axilla. During mastectomy, the incision is extended to the same area.
- A dissection is performed along the thoracic wall to the axillallary vein while sparing the large nerves and vessels.
- The specimen is excised en- block and includes lymph nodes in levels 1 and 2. The specimen should contain at least 10 lymph nodes.
- Some branches of veins are ligated at the level of the axilla.
- Hemostasis is performed.
- A vacuum drain is installed and secured with suture.
- Marcain 20ml along the wound edges.
- The incision is closed with intracuticular sutures.
- Steri-strips and compression bandages are applied.
- The drain is removed according to the surgeon, usually when < 50 ml has drained during the last 24 h
- The patient may be discharged after 2-4 days
- The bandages are changed after 5-6 days or after each shower.
- Follow-up 14 days after operation.
Physiotherapy after an operation for breast cancer is a meaningful contribution for patients to enter an appropriate rehabilitation process. Many women will be adequately helped by instruction of how to perform relevant exercises for the shoulder/arm. When lymph nodes are removed from the axilla, the lymphatic circulation in the arm is permanently reduced and lymphedema may develop. Most women are not troubled by this. Lymphedema is particularly frequent after radiation therapy in combination with axillary surgery. Around 1/3 of patients have a varying degree of problems with movement and shoulder/arm function after the operation.