Lungs
The lungs are divided into three lobes on
the right side and two lobes on the left side by the interlobar. The major
(oblique) fissures on both sides are similar. It runs obliquely forwards and
downwards (upper portion facing forward and laterally and the lower portion
facing backward and medially), passing through the hilum. On a lateral view, it
starts at the level of fourth or fifth thoracic vertebra to reach the diaphragm
5 cm behind the costophrenic angle on the left and just behind the ngle on the
right side.
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| major
fissure on lateral chest |
1. Minor fissure
2. Major fissure
Line
diagram showing the position of major fissure on lateral chest radiograph
(Reproduced with permission)
The right lung has an additional fissure,
the minor (horizontal) fissure. It can be drawn on chest PA film from right
hilum to the sixth rib in axillary line minor fissure on PA chest
 |
minor fissure on PA chest
Line diagram showing the positing of minor fissure on PA
chest radiograph (Reproduced with permission)
It separates the middle lobe from right
upper lobe. There are some accessory fissure. which are occasionally seen. The
azygos lobe fissure, so called because it contains the azygos vein on right and
hemiazygos vein on left within its lower margin, is commonly seen on the right
side with an incidence on 0.4 parcent.28 It appears as a hairline with slight
lateral convexity running across the right upper zone to end in a comma like
expansion (azygos vein) near the hilum. The azygos lobe is the area of the ling
medial to the azygos fissure. The left sided horizontal fissure, similar to the
minor fissure on the right, separated the lingular from the other upper
lobe segment. The superior accessory fissure separated the apical from the
basal segment of the lower lobes. The inferior accessory fissure separates the
medial from the other basal segment.
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