FIGURE 1.

Invasive mediastinal staging recommendations. This algorithm applies to the target population of non-small-cell lung cancer patients in Ontario who have been clinically staged T1–4, N0–3, with no distant metastases. ^a Stage 1A: T1N0M0 (T1: primary tumour diameter 3 cm or smaller and surrounded by lung or visceral pleura, or endobronchial tumour distal to the lobar bronchus; N0: no lymph nodes involved; M0: no metastases). ^b For the purposes of this guideline, a tumour in the central third of the hemithorax is considered central. A tumour in the distal two thirds of the hemithorax is considered peripheral. ct = computed tomography; pet = positron-emission tomography.