"Radiographic features "
"The Parks-Bielschowsky 3-step test is useful to identify patterns of ocular motility, specifically vertically-acting extra-ocular muscles 2."
Expected headings
"Radiographic features "
"Trochlear nerve palsy can be unilateral or bilateral, congenital or acquired 2,3."
"characteristic head tilt to the opposite side of the palsy; review old photographs to determine chronicity of observation"