where
an extra fissure divides the lung tissue into additional lobes or segments
beyond the usual lobar divisions.
It is a congenital variation that occurs during lung development.
The pathogenesis involves the
incomplete fusion of the lung during embryonic
development,
resulting in an
anatomically – an extra cleft of tissue.
functionally
do not typically affect lung function but may cause confusion during imaging interpretation, as they can resemble pathological conditions like scarring.
