“Tectal beaking” is MRI feature of:
Correct Answer: Arnold-Chiari malformation
Description: Arnold Chiari I malformation
Chiari I malformation (cerebellar ectopia and seen in adulthood.
Definition: - Descent of otherwise normal cerebellar hemispheres below the foramen magnum, usually involving tonsils.
Features: Peg like, pointed tonsils displaced into upper cervical canal
0–10 years à 6 mm at least
10–30 years à 5 mm
30–40 years à 4 mm
Associated anomalies: Syringomyelia (30–60%), hydrocephalus (20–25%), basilar invaginations (25–50%), Klippel-Feil syndrome (5–10%) and atlanto-occipital assimilation (1–5%)
Chiari II malformation (childhood).
Definition: Descent of dysplastic cerebellar hemisphere below the foramen magnum, usually involving inferior vermis, which is everted instead being inverted, causing 4th ventricle to reduce to a coronal cleft and medulla oblongata to elongate and kink.
Features:
Category:
Unknown
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now