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| Case
of the Month |
By Dr L
F Foo,
MBChB, MRCP,
FRCR
Answer to Case Of the
Month
Findings
There is
opacification of the frontal sinus. This is associated with bone destruction
of the anterior and posterior walls of the sinus. In close proximity to this
area is the superficial soft tissue mass. Intracranially, there is an
underlying lentiform extraaxial rim enhancing abnormality which crosses the
midline. Extensive filling defects are noted within the superior sagittal
sinus.
Apearances are that
of a Pott’s puffy tumour (frontal sinusitis, frontal osteomyelitis and
subperiosteal abscess), extradural abscess and sagittal sinus thrombosis.
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Pott’s Puffy
Tumour |
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In 1775, Sir John
Percivall Pott described a case of frontal sinusitis causing an indolent,
puffy, circumscribed swelling of the forehead. This was subsequently found
to be due to subperiosteal abscess formation and underlying osteomyelitis of
the frontal bone. This constellation became known as Pott’s puffy tumour.
Early diagnosis and
aggressive treatment is essential due to the real risk of intracranial
complications requiring urgent medical and surgical intervention. Spread of
infection beyond the sinus is either by the haematogenous route (via
emissary veins) or direct (via erosions or existing fractures or dehiscence
of the sinus walls).
These intracranial
complications include meningitis, extradural, subdural and intracerebral
abscesses and secondary septic thrombosis of the dural sinuses.
CT with contrast
enhancement and use of bony windows provide adequate information with
regards the intracranial extent of disease. MRI may also be of value as part
of the radiological work up.
Other recognized
complications of frontal sinusitis include orbital spread leading to orbital
cellulitis, optic neuritis, subperiosteal and intraorbital abscesses.
Treatment of the
above patient included intravenous antibiotics and surgical drainage of his
extradural haematoma with good results.
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| About
the Author |
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Dr L F Foo is currently
a Radiology trainee in Glasgow, United Kingdom.
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Last Updated:
Tuesday, 04 January, 2005
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