THE MAIN DISTINCTIVE SIGN IN CORPUS CALLOSUM DEGENERATION ON USG IS?: (A) Tear drop sign, (B) lemon sign, (C) Banana sign, (D) Ring sign
Answer is A. With complete agenesis of the corpus callosum, a normal cavum septum pellucidum cannot be visualized sonographically, and the frontal horns are displaced laterally. There is mild enlargement of the Atria posteriorly--such that the ventricle has a characteristic "Teardrop" appearance