[Unilateral isthmic lysis in x-ray computed tomography].

J Radiol

Service de Radiologie B, Hôpital Cochin, Paris.

Published: December 1988

Condensing pediculolaminar hypertrophy of mechanical origin is known as "Dahu's sign". Dahu's sign corresponds to hypertrophy of the vertebral hemi-arch found by CT scan and leads to suspicion of controlateral lysis of the isthmus. It is the CT scan equivalent of vertebral "anisocorism" by conventional radiology.

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