Table 2.

Organizing Pneumonia Characteristics

Lesion Characteristics	Number of Patients	Percent (95%CI)
Lesion location
RUL	92	61% (53%, 69%)
RML	74	49% (41%, 57%)
RLL	109	72% (64%, 79%)
LUL	92	61% (53%, 69%)
LLL	85	56% (48%, 64%)
Peripheral	66	44% (36%, 52%)
Central	5	3% (1%, 8%)
Both Peripheral and Central	79	52% (44%, 60%)
No. of lesions
Solitary	31	21% (14%, 28%)
1–5 lesions	31	21% (14%, 28%)
6–10 lesions	13	9% (5%, 14%)
>10 lesions	14	9% (5%, 15%)
Diffuse	62	41% (33%, 49%)
Margin of dominant leison
Smooth	16	11% (6%, 17%)
Lobular	21	14% (9%, 20%)
Spiculated	35	23% (17%, 31%)
Ill-Defined	78	52% (43%, 60%)
Lesion Consistency
Solid	67	44% (36%, 53%)
Internal GGO	80	53% (45%, 61%)
Air Bronchograms	40	26% (20%, 34%)
Additional lesion Characteristics
Surrounding GGO	33	22% (16%, 29%)
Cavitation	9	6% (3%, 11%)
Necrosis	1	1% (0%, 4%)
Adjacent Bronchiectasis	4	3% (1%, 7%)
Ancillary features
Lymphadenopathy	65	43% (35%, 51%)
Effusion	68	45% (37%, 53%)
Associated Pathology Findings
None	99	66% (57%, 73%)
Granulomas	13	9% (5%, 14%)
Bacteria/Organism	7	5% (2%, 9%)
Reactive Type II Pneumocytes	8	5% (2%, 10%)
Chronic Inflammation	9	6% (3%, 11%)
Acute Inflammation	7	5% (2%, 9%)
Atypical Adenomatous Hyperplasia	1	1% (0%, 4%)