CNS

DENTIGEROUS CYST?

“ Due to excessive fluid accumulation associated with the cap of unerupted molars (key to diagnosis). In total, 80% are mandibular and they rarely become malignant. The key features of cystic lesions in the maxilla and mandible are summarised in Table PLAIN FILM •  Well-corticated, unilocular cyst associated with an unerupted molar.•  Look for a fracture …

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FACETAL CYSTS

Facet joints degenerate like any other synovial joint. Facetal cysts may form containing fluid, blood or air and thus demonstrate a variable signal on magnetic resonance imaging. For Radiology Cases, Discussion join: Radiology Made Easy on Facebook  Subscribe to our youtube channel for FRCR radiology case discussion  Join our Telegram group: Radiology Made Easy   

“ADRENOLEUKODYSTROPHY”

“ Typically affects boys aged 5-10 years.  The most common mode of inheritance is X-linked recessive.  The disease starts around the lateral trigones.  Coexists with adrenal insufficiency (neurological symptoms appear first). Death occurs within 2 years. MRI •  Preferential symmetrical involvement of the optic and auditory pathways, the splenium of the corpus callosum, posterior periventricular …

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“LEWY BODY DEMENTIA”

“ Associated with Parkinsonian features. There is fluctuating cognitive impairment and visual hallucinations. MRI •  Similar to Alzheimer disease, but less sparing of the occipital lobes.•  Affects the parietal and occipital lobes and the cerebellum.” For Radiology Cases, Discussion join: Radiology Made Easy on Facebook  Subscribe to our youtube channel for FRCR radiology case discussion  …

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“TORNWALD CYST”

“ This is a posterior nasopharyngeal cyst. It is common and benign. It is filled with proteinaceous material that will intermittently discharge its contents, causing halitosis and a bad taste. They rarely become infected. CT•  High-attenuation (due to protein content) nasopharyngeal cyst MRI •  Thin-walled cyst•  High signal on T1 and T2 (protein content)•  No …

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“JUVENILE NASOPHARYNGEAL ANGIOFIBROMA”

“ This is the most common benign nasopharyngeal tumour. The typical scenario is a teenaged boy with epistaxis.  These are highly vascular tumours and can be locally aggressive. CT •  Densely enhancing mass involving the nasal wall, retromaxillary or pterygopalatine fossa.•  Widening of the pterygopalatine fossa in 90%—pathognomonic.•  Erosion of the medial pterygoid plate is …

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SKULL BASE MALIGNANCY

“•  The vast majority of skull base malignancies are due to metastatic disease, most commonly from breast cancer.•  Primary sources include chordoma (clivus), chondrosarcoma, sarcoma, paraganglionoma etc.” For Radiology Cases, Discussion join: Radiology Made Easy on Facebook  Subscribe to our youtube channel for FRCR radiology case discussion  Join our Telegram group: Radiology Made Easy   

“Capillary hemangioma of the orbit (INFANTILE)”

“ These typically regress after 2 years. They increase in size with Valsalva and large lesions consume platelets. CT •  Lobular lesion that enhances intensely MRI •  Prominent curvilinear flow voids ” For Radiology Cases, Discussion join: Radiology Made Easy on Facebook  Subscribe to our youtube channel for FRCR radiology case discussion  Join our Telegram …

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“ORBITAL LYMPHATIC MALFORMATION”

“ Also known as lymphangioma or cystic hygroma, they are the most common vascular orbital tumour. They usually affect children aged 3-15 years and tend to bleed. Bleeds cause sudden proptosis. They are associated with chromosomal abnormalities including Turner syndrome, trisomies and Noonan syndrome. CT •  Multi-cystic lesion with fluid-fluid levels (from recurrent haemorrhage)•  More …

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