Table 7. Distribution of left lung segments involvement by region.

Segment	Involved (percentage of total)	Not involved (percentage of total)
Left apical	391 (36.67%)	675 (63.32%)
Left posterior	517 (48.49%)	549 (51.5%)
Left anterior	335 (31.42%)	731 (68.57%)
Left superior lingular	512 (48.03%)	554 (51.97%)
Left inferior lingular	522 (48.86%)	544 (51.03%)
Left superior basal	522 (48.86%)	544 (51.03%)
Left medial basal (assumed)	408 (38.27%)	658 (61.72%)
Left lateral basal	554 (51.97%)	512 (48.03%)
Left posterior basal	614 (57.59%)	452 (42.4%)
Left anterior basal	220 (20.63%)	846 (79.36%)