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20 Cards in this Set
- Front
- Back
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Pleomorphic adenomas are also known as? |
Benign mixed tumours |
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Most common sites of extracranial H&N dermoids?
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1. Superolateral orbit (zygomaticofrontal suture)
2. Oral cavity |
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Most common pharynageal mucosal space cancers to present with nodes? |
1. SCC (90%)
2. Lymphoma (50%) |
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Phthisis bulbi |
* end-stage eye disease
* atrophic, scarred, disorganised +/- Ca2+ * causes varied - infection, trauma, inflammatory, XRT, tumour, etc |
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Cholesterol granuloma of the petrous apex |
* 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 |
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DDx of thyroglossal duct cyst |
* lingual or sublingual duct cyst
* dermoid or epidermoid * abscess |
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What structure can be used as a marker for the intraparotid facial nerve? |
Retromandibular vein, which lies just medially |
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Inverted papillomas: general features |
* 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 |
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Scwhannoma: MRI features |
* CT: isodense to brain parenchyma; C+; contain cystic components
* MRI: T1 iso; T2 high; C+ |
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Keratosis obturans |
Bilateral inflammatory ear masses associated with chronic sinusitis and bronchiectasis |
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Pattern of uptake on NM technetium scans in Graves disease? |
Diffuse avid uptake in a uniform pattern |
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Waveforms of ICA vs. ECA |
ICA: low resistance ECA: high resistance with every diastolic flow reversal |
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Primary malignant uveal melanoma |
* most common orbital tumour in adults
* arise from the ciliary body or choroid' * mets: liver > lung > bone > kidney > brain |
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Pleomorphic adenoma: MR features |
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T1: low * T2: high with low T2 rim * C+: homogeneous enhancement |
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Pleomoprhic adenoma: CT features |
* smooth or lobulated masses
* prominent enhancement * +/- Ca2+ * larges ones can be heterogeneous due to necrosis |
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Warthin tumour: CT features |
* bilateral, parotid tail
* cystic lesion with focal nodule * no Ca2+ |
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Warthin tumour: MRI features |
* T1: low/iso w/ high foci (Ca2+)
* T2: heterogeneous * C+: usually nil |
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Le Fort type 1 |
"Floating palate" * fracture line passes through the alveolar ridge, lateral nose and inferior wall of maxillary sinus |
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Le Fort type 2 |
"Floating maxilla" * fracture arch passes through posterior alveolar ridge, lateral walls of maxillary sinuses, inferior orbital rim and nasal bones |
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Le Fort type 3 |
"Floating face" * fracture line passes through nasofrontal suture, maxillo-frontal suture, orbital wall and zygomatic arch |
