Flat waist sign:
It refers to flattening of the contours of the aortic arch and adjacent pulmonary trunk. It is seen in severe LLL collapse and is caused by leftward displacement and rotation of the heart.
Maiden waist sign:
It refers to the medial deviation of ureters in retroperitoneal fibrosis.
Wasp waist sign:
- Wasp waist: Severely narrow waist
- Seen in Klippel Feil syndrome
- Klippel-Feil syndrome is defined by congenital fusion of at least 2 cervical vertebrae with an absence of the intervertebral discs
- The classical triad consists of a short neck, limitation of head and neck movements and a low posterior hairline
- The wasp-waist sign (arrowhead) refers to the vertebral body narrowing and associated concavity of the vertebrae at the level of the fused segment.
- Flat waist sign: Left lower lobe collapse
- Maiden waist sign: Retroperitoneal fibrosis
- Wasp waist sign: Klippel Feil syndrome.