base of skull


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base of skull

(bās skŭl)
The sloping floor of the cranial cavity. It comprises both the external base of skull (external view) and the internal base of skull (internal view).
Synonym(s): basis cranii [TA] .
References in periodicals archive ?
Contrast-enhanced computed tomography (CECT) of the base of skull and nasopharynx showed contrast-enhancing heterogeneous mass lesion involving the left nasopharynx, sphenoid sinus, and base of skull [Figure 3], without any significant cervical lymphadenopathy.
[1] This foramen opens on the base of skull lateral to scaphoid fossa.
Thin cut contrast enhanced CT with sagittal and coronal reformation or MRI Brain with contrast in prone position were done to determine the site of bony or dural defect by observing a contrast enhancing area at the base of skull. All procedures were performed by a consultant neurosurgeon under general anaesthesia (GA).
The imaging protocol consisted of appropriately angled continuous 5mm thick axial slices for the posterior fossa and 10 mm thick slices for the rest of brain from the base of skull to the vertex.
"For some diagnoses, such as prostate cancer, paranasal sinus cancer or base of skull tumours, proton therapy is much better than conventional photon radiotherapy," says Dr Kubes.
It is most effective used against cancers including tumours affecting the base of skull or the spine.
For species with curved horns, it is convenient and functional to divide the horn into the stem--from the base of skull up to the first arch--catching arch, and stabbing region--the straightened section up to the tip of the horn.
Sphenoid bone lies in the base of skull, "wedged" between the frontal, temporal, and occipital bones.
It is a type of radiotherapy that uses a high energy beam of protons rather than high energy X-rays to deliver a dose of radiotherapy for patients with cancer; | It works best on very rare cancers, including tumours affecting the base of skull or spine; | It can be a more effective form of therapy because it directs the radiation treatment to precisely where it is needed - with minimal damage to surrounding tissue.
Pencil beam scanning will allow radiation oncologists to more precisely treat many of these tumors and will be particularly beneficial for head and neck, base of skull and certain prostate tumors.
(4) One of the 4 patients had haemotympanum on clinical examination, and a CTB was requested to exclude a base of skull fracture, but instead revealed a mandibular condyle fracture as the cause of the haemotympanum.
Thin section high resolution CT scan with MPR may aid the diagnosis of base of skull defects in patients with RM without CSF rhinorrhea when the plain CT scan/ MRI are negative.8 All the patients with recurrent meningitis should undergo diagnostic imaging to identify underlying defects of skull and spine.