"prevertebral portion: anteriorly located"
"paraspinal portion: posteriorly located"
"T1: hypointense with high signal post-contrast"
"T2: hyperintense with contrast enhancement 5"
"in the acute phase of vertebral osteomyelitis, there is bone marrow oedema and this is detected by signal changes with low signal intensity on T1 weighted images (WI) and high signal intensity on T2-WI, especially fat saturated techniques/spectroscopic inversion recovery (SPIR) or short tau inversion recovery (STIR) sequences4"
"chordomas appear as homogenous hypointense/isointense lesions on T1-WI, hyperintense on T2-WI and show post-gadolinium high signal; tumour develops within the vertebral bodies and frequently invades perivertebral space/epidural space and can span several vertebral segments 2"
"In general, the prevertebral component is measured on sagittal imaging as the distance between the anterior border of the vertebral body and the air within the pharynx/trachea."
"A mass arising from the prevertebral portion is centred on the vertebral body or prevertebral muscles, which causes anterior displacement of the muscles as opposed to a mass arising from the retropharyngeal space which would cause flattening of the prevertebral muscles posteriorly against the vertebral body 1."
"A mass arising from the paraspinal portion displaces the paraspinal musculature and posterior cervical space fat away from the spine. Extension of malignant and benign lesions into the epidural space from the perivertebral space is common 1."
"chordomas appear as homogenous hypointense/isointense lesions on T1-WI, hyperintense on T2-WI and show post-gadolinium high signal; tumour develops within the vertebral bodies and frequently invades perivertebral space/epidural space and can span several vertebral segments 2"
Expected headings
"Contents"
"Boundaries"
"Normal thickness"
"chordomas are rare and aggressive tumours arising from notochordal remnants in the axial skeleton; on CT the mass is typically hypodense/isodense and associated with lytic vertebral bone destruction and may extend over a number of levels 2"
"chordomas appear as homogenous hypointense/isointense lesions on T1-WI, hyperintense on T2-WI and show post-gadolinium high signal; tumour develops within the vertebral bodies and frequently invades perivertebral space/epidural space and can span several vertebral segments 2"