This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Tectal breaking is seen in - 
Select and explain. 
A. Dandy-walker malformation, B. Arnold-chiari malformation, C. Aqueductal stenosis, D. Third ventricular tumor
B: Arnold-chiari malformation
Answer: B: Arnold-chiari malformation 
Explanation: Arnold Chiari malformation  :

It is herniation of tonsils of cerebellum and medulla oblongata through Foramen magnum into vertebral canal. This results in blockage of exits in the roof of the fourth ventricle (foramen of Magendie & Luschka) causing hydrocephalus. Schwartz mentions that —
"there is a dorsal kink in the cervicomedullary junction and breaking of the Quadrigeminal plate."
The quadrigeminal plate is the dorsal part of the midbrain and its another name is Tectum.