Abstract
The review article presents detailed information on the new classification of lung tumours issued by the World Health Orga-nization. In comparison with the previous 2004 classification, there have been numerous changes that are dealt with in detail and that include, among other things, integration of molecular genetic testing and morphological examination with respect to a more precise diagnosis when molecular targeted therapy is indicated.
The new classification also includes terminology changes as well as the current criteria for morphological evaluation of findings of small biopsy and cytology and in resected tumour samples. Also, the diagnostic criteria for adenocarcinoma in situ and minimally invasive lung adenocarcinoma have been newly defined.