What is the fine-grained topic of the following text: This review describes the main features of central airway pathology and compares the imaging findings, especially the ones of multidetector computed tomography (MDCT) and virtual bronchoscopy, with those in pathology and direct bronchoscopy, in order to propose a schematic and practical approach to establish diagnoses. Only return the topic.
Comparing imaging findings in central airway pathology with pathology and direct bronchoscopy.