Table 1. Pulmonary pathological findings in the autopsies of 13 patients who were positive for SARS-CoV-2.

Patient	1	2	3	4	5	6	7	8	9	10	11	12	13
Duration of disease (days)	12	16	7	6	12	22	23	32	27	34	33	40	32
Mechanical ventilation (days)	none	12	none	none	none	7	8	6	20	15	24	31	22
Lung weight (g, both lungs)	1990	2650	2200	2150	2100	2350	650	2100	2350	2400	840	2240	2100
Demonstration of microthrombi	no	yes	yes	yes	no	no	yes	no	yes	no	no	no	yes
Alveolar edema	diffuse	focal	diffuse	focal	patchy	focal	no	no	no	focal	no	focal	diffuse
Alveolar hemorrhage	no	no	focal	focal	no	focal	focal	focal	patchy	focal	focal	focal	no
Hyaline membranes	patchy	focal	patchy	patchy	patchy	patchy	focal	none	focal	focal	patchy	focal	none
Hyperplasia of type II pneumocytes	none	patchy	focal	marked	focal	focal	patchy	patchy	patchy	patchy	patchy	patchy	focal
Squamous metaplasia	no	focal	no	patchy	focal	no	focal	focal	focal	focal	focal	focal	focal
Polynucleated cells	no	yes	no	no	no	yes	yes	no	yes	yes	yes	no	no
Acute inflammation	none	none	patchy	patchy	none	patchy	none	none	patchy	patchy	no	patchy	patchy
Lymphohistiocytic inflammation*	M	PB	PB	PB, I	I	PB, I	PB, I	PB, I	I	I	PB, I	PB, I	PB, I
Interstitial fibrosis	none	mild/focal	none	mild/focal	mild/focal	none	none	mild/focal	marked	marked	marked	mild/ focal	mild/focal

*classification: M, mild; PB, peribronchial aggregates; I, interstitial aggregates