Left Upper Lobectomy and Lingula Removal
In standard left upper lobectomy for localized lung cancer, the lingula (segments IV and V) is removed along with the upper division (segments I-III), constituting a complete left upper lobe resection. However, emerging evidence supports that selective preservation of the lingula through trisegmentectomy may be oncologically equivalent for appropriately selected patients with early-stage disease 1, 2, 3, 4.
Standard Anatomic Approach
The left upper lobe consists of two anatomic divisions: the upper division (apical-posterior and anterior segments I-III) and the lingula (superior and inferior lingular segments IV-V) 1, 5.
Traditional left upper lobectomy removes all five segments (I-V), which is the established standard of care for stage I and II NSCLC 6.
The American College of Chest Physicians recommends lobectomy with systematic lymph node sampling or mediastinal node dissection as the standard extent of resection for lung cancer 6.
Alternative Parenchyma-Sparing Approaches
Trisegmentectomy (Upper Division Only)
Left upper trisegmentectomy removes only segments I-III while preserving the lingula (segments IV-V), analogous to right upper lobectomy that preserves the middle lobe 1, 4, 5.
This approach is appropriate for tumors confined to the apical portion of the left upper lobe, particularly those ≤2 cm in the upper division 2, 4, 5.
Recent propensity-matched data from 2025 demonstrates equivalent 5-year overall survival (75.9% vs 82.1%, p=0.28) and locoregional recurrence-free survival (73.7% vs 80.0%, p=0.23) comparing left upper lobectomy versus trisegmentectomy for clinical stage IA-IIA disease 4.
Lingulectomy (Lingula Only)
Conversely, lingulectomy removes only segments IV-V while preserving the upper division (segments I-III) for tumors confined to the lingula 1, 2.
A 2023 meta-analysis of 1,196 patients showed that left upper lobe multi-segmentectomy (trisegmentectomy or lingulectomy) resulted in better 5-year disease-free survival (93.1% vs 88.4%, p=0.041) and shorter hospital stay compared to lobectomy, with no difference in overall survival or recurrence rates 3.
Critical Selection Criteria for Parenchyma-Sparing Resection
Tumor location must be clearly confined to either the upper division or lingula with adequate margins (equal to tumor diameter or ≥2 cm) 1.
Clinical stage must be T1-2 N0 with systematic hilar and mediastinal lymph node dissection performed to ensure accurate staging 1, 2, 4.
Multiple studies confirm that tumors up to 6.3 cm can be safely resected with split-lobe procedures when margins are adequate and complete lymphadenectomy is performed 1.
Patients with compromised pulmonary function (FEV₁ <80% predicted or predicted postoperative values approaching 40%) should be strongly considered for parenchyma-sparing approaches 6, 7, 8.
Lymph Node Dissection Requirements
Regardless of whether complete lobectomy or segmentectomy is performed, systematic hilar and mediastinal lymph node dissection is mandatory 6, 1, 4.
Studies demonstrate equivalent lymph node sampling between left upper lobectomy and trisegmentectomy (median 7 vs 6 nodes, p=0.36) with similar N2 station sampling patterns 4.
The presence of N1 or N2 disease does not necessarily exclude split-lobe procedures, provided complete lymphadenectomy is performed 1.
Common Pitfalls to Avoid
Do not assume that all left upper lobe tumors require complete lobectomy—carefully assess tumor location within the lobe to determine if parenchyma-sparing resection is feasible 1, 2, 3.
Inadequate surgical margins (<2 cm or less than tumor diameter) compromise oncologic outcomes regardless of resection type 1.
Failure to perform systematic lymph node dissection undermines the oncologic adequacy of any parenchyma-sparing approach 6, 1, 4.
Video-assisted thoracoscopic surgery (VATS) should be preferred over thoracotomy when technically feasible, as it reduces complications and improves recovery without compromising oncologic outcomes 7, 8, 5.