Butterfly and lumbosacral transitional vertebrae

Case contributed by Vikas Shah
Diagnosis almost certain


Undergoing CT colon for change in bowel habit.

Patient Data

Age: 70 years
Gender: Female

Selected images from CT colon


These selected images covering the lumbosacral spine show that L4 has a butterfly vertebral body shape with thin bony bridges anteriorly and posteriorly, and a gap centrally.

The right transverse process of L5 is expanded and forms a pseudoarticulation with S1.

Case Discussion

This study shows two incidental findings of the lumbosacral spine; a butterfly vertebral body and a type IIa lumbosacral transitional vertebral body (Castellvi classification).

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