Head and Neck ImagingJugular bulb, protruding
jugular bulb protruding into the
middle ear through a
congenital defect of the jugular plate. Otoscopically, a retrotympanic
vascular mass is seen in the lower part of the middle ear. This is usually asymptomatic, but may cause
tinnitus or
conductive hearing loss.
CT shows a soft tissue mass low in the middle ear, contiguous with the internal jugular
vein through the jugular plate defect (
Fig.1). The other margins of the jugular foramen are smooth and intact, differentiating this condition from a jugulotympanic
glomus tumour.
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Axial (a) and coronal (b) CT image shows on the left a wide jugular bulb, protruding into the middle ear through a focal jugular plate defect (arrow).
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Jugular bulb, protruding, Fig.1 (a) | | Jugular bulb, protruding, Fig.1 (b) | |