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Table 3 Lobar involvement and lesion distribution on chest CT

From: Chest CT imaging features of COVID-19 and its correlation with the PaO2/FiO2 ratio: a multicenter study in Upper Egypt

Normal 84 20.8%
Number of involved lobes
 One lobe 40 12.5%
 More than one lobe 280 87.5%
Frequency of lobe involvement
 Upper lobes 256 80%
 Middle lobe 212 66.3%
 Lower lobes 308 96.3%
Pattern of involvement
 Upper only 10 3.1%
 Middle only 0 0%
 Lower only 56 17.5%
 Upper + middle + lower lobes 204 63.8%
 Upper + lower lobes 42 13.1%
 Middle + lower lobes 8 2.5%
Distribution of the lesions
 Peripheral 134 41.9%
 Central 2 0.6%
 Peripheral and central 184 57.5%
Site of the lesions
 Anterior 10 3.1%
 Posterior 186 58.1%
 Anterior and posterior 124 38.8%