Chordoma can occur over all the following sites, except –
Correct Answer: Rib
Description: Chordoma occurs only in vertebrae and clivus
Chordoma
Chordoma is a rare malignant tumour originating from the remnants of the primitive notochord.
As the vertebrae develop, notochord disappears and in adults, the normal remnant of notochord is nucleus pulpous of the intervertebral disc. In chordoma, this embryonic notochordal foci remains inside the vertebral body and forms tumours.
It occurs in adult males after 50 years.
It commonly occurs in the sacrococcygeal or in the sphere-occipital regions. The sacrum is the most common site: - Sacrum 50% clivus (35%), cervical thoracic/lumbar (15%).
Most of them occur in vertebral bodies.
Category:
Orthopaedics
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