Table 1. Differential lobar distribution of NTM lung disease.

Number of patients	Patient population	# lobes total for analysis with lingula counted as a separate lobe	Frequency of involvement	Ref
24 non-surgical subjects	Immunocompromised with NTM lung disease	143 lobes	RML > lingula > LUL	(6)
24 non-surgical subjects	Immunocompetent with NTM lung disease	144 lobes	RUL > RML > lingula	(6)
55 non-surgical	With MAC lung disease	Not stated	RML > RUL > lingula	(7)
128 non-surgical	NTM lung disease	–	RUL (51%), RML (46%), RLL (39%), lingula (36%), LUL (32%), and LLL (6%)	(8)
236 surgical patients and 265 lung resections	NTM lung disease subjects who underwent lung resection: 126 lobectomies, 55 segmentectomy, 44 pneumonectomy, 40 mixed procedures	Not stated	Resections in: 71 RML, 46 lingula, 27 RUL, 20 lobectomy + segmentectomy, 18 bilobectomy, 27 right pneumonectomy, 17 left pneumonectomy	(9)

LLL, left lower lobe; LUL, left upper lobe; MAC, Mycobacterium avium complex; NTM, non-tuberculous mycobacteria; RLL, right lower lobe; RML, right middle lobe; RUL, right upper lobe.