Case report: Occult lymph nodal metastasis in sub-centimeter lung cancer: a report of seven cases and review of literature

Sub-centimeter lung cancers with radiological feature of PSN are at risk for lymph node metastasis. Surgeons should pay close attention to intraoperative rapid pathology results to prevent inadequate surgical treatment. Adenocarcinoma patients often present with one or more high-risk factors for recurrence, active adjuvant treatment and follow-up are necessary.