Interlobar fissures on HRCT

The curvilinear interlobar fissures have a thickness of 0.15 mm. The right minor fissure has a boomerang configuration (arrow); inside the boomerang, the middle lobe is visible, surrounded by the right upper lobe. The right major fissure appears as an oblique straight line, delineating the superior segment of the right lower lobe posteriorly.