"Contents "
"T1: higher signal than muscle"
"T2: lower signal than muscle 2"
"neonates and young children have limited amounts of fat within the parotid gland which decreases the amount of natural contrast available on CT, which increases the difficulty to perceive a mass lesion and define its margins."
"A large mass arising within the deep lobe of the parotid will medially displace fat in the parapharyngeal space and cause posteromedial displacement of the posterior belly of the digastric muscle and carotid space. There is also often associated widening of the stylomandibular notch 1,2."
"with the parotid gland filling around two-thirds of the parotid space, US findings will reflect those of the parotid gland 3"
"facial nerve is not visualised on US, but is inferred to be located lateral to the retromandibular vein 8 "
Expected headings
"Contents "
"Radiographic appearance"
"Ultrasound"
"CT"
"MRI"
"superior margin: external auditory canal; apex of the mastoid process 3"
"allows for good visualisation of deep lesions as well as reliable assessment of size, location, margins, extracapsular extension, involvement of adjacent structures, and areas of necrosis, haemorrhage, calcification of cysts 5"
"A large mass arising within the deep lobe of the parotid will medially displace fat in the parapharyngeal space and cause posteromedial displacement of the posterior belly of the digastric muscle and carotid space. There is also often associated widening of the stylomandibular notch 1,2."