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Radiodiagnosis Exam Answers
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Here's a summary of what's covered for each question:

Q	Topic	Key Content
Q1	Carcinoma Oral Tongue (20 marks)	Imaging modalities (US/MRI/CT/PET-CT), AJCC 8th edition T-staging with DOI, cervical lymph node levels I–III
Q2	MRI in Multiple Sclerosis (20 marks)	All MRI sequences, Dawson's fingers, Central Vein Sign, McDonald 2017 criteria, full differential diagnosis table for white matter lesions
Q3	Pleomorphic Adenoma Parotid	US/CT/MRI features, T2 hyperintensity, ADC values, comparison table vs Warthin's/malignant tumors
Q4	OMU & Paranasal Sinuses	OMU components (uncinate, infundibulum, hiatus semilunaris), CT protocol, anatomical variants (Concha bullosa, Haller cell, Onodi cell)
Q5	HRCT Temporal Bone / Cholesteatoma	Scutum erosion, ossicular chain, LSCC fistula, tegmen erosion, facial nerve canal; DWI MRI role
Q6	ACR TI-RADS	Complete 5-feature point scoring system, TR1–TR5 categories, management thresholds
Q7	Proptosis in a Child	Age-based differential, US/CT/MRI features of rhabdomyosarcoma, hemangioma, neuroblastoma, retinoblastoma
Q8	Carcinoma Larynx CT/MRI	Laryngeal compartments, cartilage invasion signs, PES/paraglottic space, T-staging table
Q9	Medulloblastoma CT/MRI	Hyperdense NCCT, restricted DWI, Chang staging, differential diagnosis table vs ependymoma/pilocytic astrocytoma
Q10	NCCT & CTA in Acute Ischemic Stroke	HMCA sign, ASPECTS score, LVO identification, collateral grading, CTP penumbra-core mismatch, DAWN/DEFUSE-3 criteria