Determining Tracheobronchial Tree with Anatomical Dissection: 204 Cases.

Objectives: There are various anatomic variations in the tracheobronchial system. The frequency in studies with bronchoscopy was contradictory. This study aimed to investigate the tracheobronchial tree of the deceased patients with anatomical dissection.

Material and methods: We made anatomical dissections on 204 cases in the Council of Forensic Medicine, Ministry of Justice. The deceased patients who were older than 12 years of age and of Turkish origin were included in this study consecutively.

Results: Of the 204 cases, 161 (78.9%) were males and 43 (21.1%) were females. The mean age was 44.15±19.23 years. Anatomical variations were found to be present in 200 cases (98% of total). The highest degree of variation of the right upper lobe was noted to be 16.6% (34/204). An anomalous arrangement (with three segments or different placement) of the middle lobe was noted in 16.1% of cases. For the basal lower lobe, b8+(b9+b10) pattern and basal orifice with four segments were noted to be the most frequent anatomical variant in the right and left lungs, respectively. The most frequent tracheobronchial variations were as follows: apical basal lobe with two subsegments in the right and left (39.7%), left lower lobe basal orifice with four segments (34.8%), left upper lobe with three segments (25.5%), and right lower lobe basal orifice with three main segmental bronchi (21.1%).

Conclusion: The tracheobronchial tree exhibits highly individualistic features. The knowledge of the frequency of different variations obtained in different studies and normal anatomic variants in return makes doing therapeutic or diagnostic interventions easier and more accurate.