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Anatomic lung resection — lobectomy, segmentectomy and pneumonectomy
In early-stage NSCLC the standard operation is lobectomy with systematic sampling of N1 and N2 nodes, but for a peripheral tumour up to 2 cm with negative nodes an anatomic segmentectomy is equivalent or better, and pneumonectomy is reserved for cases in which clear margins cannot be obtained any other way.
Why it matters in the exam
Exam questions on this topic turn on one decision: which resection fits this tumour and this patient. The deciding data are tumour size, location (peripheral or central), the ground-glass (GGO) versus solid component, nodal status and lung function. For years lobectomy was the only standard, because the 1995 LCSG trial showed more local recurrence after limited resection; two newer randomised trials changed the picture — JCOG0802 (2022) showed better overall survival after segmentectomy for peripheral tumours up to 2 cm, and CALGB 140503 (2023) showed that sublobar resection (wedge or segment) is non-inferior when the nodes are checked by frozen section during surgery and found negative.
The exam also asks about technical details: a margin of at least 2 cm, or at least the tumour diameter, in sublobar resection; sampling of at least 3 N2 stations, one of them subcarinal (station 7), plus N1 nodes, and at least 6 nodes in total according to ESTS; and a preference for a minimally invasive approach (VATS or robotic), which shortens hospital stay and reduces complications. For a central tumour invading the origin of a lobar bronchus, sleeve lobectomy is preferred over pneumonectomy, because pneumonectomy, especially on the right, carries much higher mortality and morbidity and severely impairs quality of life. A non-anatomic wedge resection suits a small pure ground-glass lesion or a patient who will not tolerate a larger resection.
In stage IIIA disease with N2 involvement surgery is part of combined treatment — neoadjuvant therapy (chemotherapy with immunotherapy) followed by resection, not primary surgery. A patient unfit for surgery with stage I disease is referred for stereotactic radiotherapy (SBRT).
Key points
- Lobectomy with node sampling is the foundation.
- Segmentectomy for a peripheral tumour up to 2 cm with negative nodes.
- A margin of at least 2 cm in sublobar resection.
- Sleeve resection is preferred over pneumonectomy.
- Known N2 — combined treatment, not surgery first.
Summary table
| Resection | When | Exam points |
|---|---|---|
| Lobectomy | NSCLC stage I–II in a fit patient | The standard; N1 and N2 node sampling is mandatory |
| Anatomic segmentectomy | Peripheral tumour up to 2 cm, negative nodes | JCOG0802: better survival; margin of at least 2 cm |
| Wedge resection | Small pure GGO or a patient with low reserve | Not anatomic; the margin is what matters |
| Sleeve resection | Central tumour at the lobar bronchus origin | Avoids pneumonectomy |
| Pneumonectomy | Central tumour that cannot be removed otherwise | High mortality, right worse than left |
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Sources
- NCCN Clinical Practice Guidelines in Oncology: Non-Small Cell Lung Cancer, 2025 — Principles of Surgical Therapy
- ESTS guidelines for intraoperative lymph node staging in non-small cell lung cancer, 2006 — Systematic nodal dissection and sampling
- Shields' General Thoracic Surgery, 8th edition (2019) — Lobectomy, segmentectomy and pneumonectomy
Sources are given for further reading; the text is written afresh and not copied from them.
Reviewed by the Examqo AI Professor · 2026-11-06. The text may contain errors; when in doubt, check the source.