Head And Neck Radiology

Front 1

Pleomorphic adenomas are also known as?

Back 1

Benign mixed tumours

Front 2

Most common sites of extracranial H&N dermoids?

Back 2

1. Superolateral orbit (zygomaticofrontal suture)
   
2. Oral cavity

Front 3

Most common pharynageal mucosal space cancers to present with nodes?

Back 3

1. SCC (90%)
2. Lymphoma (50%)

Front 4

Phthisis bulbi

Back 4

• end-stage eye disease
• atrophic, scarred, disorganised +/- Ca2+
• causes varied - infection, trauma, inflammatory, XRT, tumour, etc

Front 5

Cholesterol granuloma of the petrous apex

Back 5

• benign
• contains blood products, T1 high signal
• no ehancement
• smooth bone erosion
• aetiology: recurrent bleeding of small vessels due to negative pressure of an obstructed petrous apex
• look for: paranasal / mastoid opacification

Front 6

DDx of thyroglossal duct cyst

Back 6

• lingual or sublingual duct cyst
• dermoid or epidermoid
• abscess

Front 7

What structure can be used as a marker for the intraparotid facial nerve?

Back 7

Retromandibular vein, which lies just medially

Front 8

Inverted papillomas: general features

Back 8

• arise from the lateral wall
• macroscopically similar to nasal polyps
• frond-like projections
• benign, possibility of malignant transformation
• avid post contrast enhancement
• can demonstrate bony destruction

Front 9

Scwhannoma: MRI features

Back 9

• CT: isodense to brain parenchyma; C+; contain cystic components
• MRI: T1 iso; T2 high; C+

Front 10

Keratosis obturans

Back 10

Bilateral inflammatory ear masses associated with chronic sinusitis and bronchiectasis

Front 11

Pattern of uptake on NM technetium scans in Graves disease?

Back 11

Diffuse avid uptake in a uniform pattern

Front 12

Waveforms of ICA vs. ECA

Back 12

ICA: low resistance

ECA: high resistance with every diastolic flow reversal

Front 13

Primary malignant uveal melanoma

Back 13

• most common orbital tumour in adults
• arise from the ciliary body or choroid'
• mets: liver > lung > bone > kidney > brain
  

Front 14

Pleomorphic adenoma: MR features

Back 14

• T1: low

• T2: high with low T2 rim

• C+: homogeneous enhancement

Front 15

Pleomoprhic adenoma: CT features

Back 15

• smooth or lobulated masses
• prominent enhancement
• +/- Ca2+
• larges ones can be heterogeneous due to necrosis

Front 16

Warthin tumour: CT features

Back 16

• bilateral, parotid tail
• cystic lesion with focal nodule
• no Ca2+

Front 17

Warthin tumour: MRI features

Back 17

• T1: low/iso w/ high foci (Ca2+)
• T2: heterogeneous
• C+: usually nil

Front 18

Le Fort type 1

Back 18

"Floating palate"

• horizontal maxillary fracture, separating the teeth from the upper face
  
• fracture line passes through the alveolar ridge, lateral nose and inferior wall of maxillary sinus
  

Front 19

Le Fort type 2

Back 19

"Floating maxilla"

• pyramidal fracture, with the teeth at the pyramid base, and nasofrontal suture at its apex
  
• fracture arch passes through posterior alveolar ridge, lateral walls of maxillary sinuses, inferior orbital rim and nasal bones
  

Front 20

Le Fort type 3

Back 20

"Floating face"

• craniofacial disjunction
• fracture line passes through nasofrontal suture, maxillo-frontal suture, orbital wall and zygomatic arch