In humans, radiographic abnormalities typically include bilateral lobar changes (7); in this dog, the accessory lung lobe was primarily affected on initial imaging, and this finding was interpreted as aspiration pneumonia.
Histopathologic analysis of accessory lung lobe of dog with pneumonic plague (hematoxylin and eosin stain), Colorado, USA.
The most widely accepted theory is that it results from formation of an accessory lung
bud inferior to the normal lung buds during development.
Other terms including pulmonary sequestration, ectopic or accessory lung
, and bronchopulmonary foregut malformation have been used to name this malformation (CANPOLAT & EROKSUZ, 2007).
Focally extensive tan discoloration and fibrosis were present in the right accessory lung
lobe with associated hemorrhage and congestion.