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39 Cards in this Set
- Front
- Back
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What are 3 exceptions to the rule of masses belonging to a particular space
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multispacial masses
transpatial mass agressive mass that destroy fascia |
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What are congenital lesions that occur before the deep cervical fascia layers were made
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lymphatic
vascular malformations |
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What are aquired process that may destroy fascia
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malignancy or aggresive infection
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What are the best 3 MR sequences to look at MR pathology
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T1
T1 + gad T2 |
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What is the part of the pharynx that is just posterior to the nasal cavity
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nasopharynx
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What are the tissues of the parapharyngeal space
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mucosa, lymphoid tissue
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What is the ddx of a pharngeal mass
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Squamous cell carcinoma, lymphoma
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Where is the superior aspect of all the suprahyoid spaces
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skull base
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What should always be checked if there is a mass in a suprahyoid space
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if there is invasion through the skull base
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What does the masseter space contain
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muslces, bones, teeth , V3
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What is the mc mass of the masticator space
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mass related to teeth
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When do abscess related to teeth typically occur
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after removal of teeth
(look in the bone window to see if a tooth has been removed) |
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Do you always get an enhancing rim enhancement of an abscess
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no, not in the head and neck like the brain
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What is the most common pediatric malignancy arising in the head and neck in children
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rhabdomyosarcoma
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What is the ddx of malignancy of the massticator space
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sarcoma of the mandible or sarcoma of the muscles
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What are the contents of the carotid space
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carotid artery, jugular vein
nerves |
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What is the ddx of lesions in the carotid space
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aneurysm
carotid body tumur jugular vein thrombosis nervesheath tumor |
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What are 2 types of nerve sheath tumors
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schwannoma
neurofibroma |
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Do neurofibromas enhance on CT
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no, but they will on MR
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What are the characteristics of a carotid body tumor
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T1 +gad : vivid nodular enhancement
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What happens to the ICA and ECA when there is a carotid body tumor
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splaying
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What is the appearance of a pleomorphic adenoma on MR (T1, T2 fat sat)
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T1: dark
T2 fat sat images: bright well defined |
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What is the ddx of a parotid space mass
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inflammatory LN
parotid neoplasm (pleomorphic adenoma) nerve sheath tumor |
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What is located in the parotid space
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salivary tissue
lymphnodes CN 7 parotid tissue |
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Which way is the parapharyngeal fat pushed from a parotid space mass
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anterior medially
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What is the most common parotid mass
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pleomorphic adenoma
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What does a pleomorphic adenoma look like on post contrast imaging
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bright and heterogeneous, (looks like necrosis but is not)
remember it is bright on T2 and usually well circumscribed |
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What is in the PVS, RPS and PCS
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PVS: bones, disks
RPs: nodes PCS: nodes, CN11 |
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Where do hygromas commonly occur
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Posterior cervical space
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What is a common cause of a mass in the perivetebral space
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discitis
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Can a discitis lead to a a prevetebral abscess
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yes
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can a diskitis spread across the midline
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yes
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What should you alway check if there is a discitis
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see if it has spread to the spinal cord
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Can a prevetebral be distinguished from a retropharngeal mass on a lateral plain film
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no
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What is a rounded mass medial to the carotid space
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A lymphnode in the retropharyngeal space
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What is a common congenital lesion of the posterior cervical space
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hygroma
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What does a hygrooma look like on CT
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well defined, no enhancement
fluid density |
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What is the ddx for a PCS mass
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cystic hygroma or LAD (lymphoma or SCC mets from scalp tumor)
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How does a multilocular lymphatic malformation present
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multispatial mass
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