Cerebellar heterotopia in the orbit
N. B. Call and H. I. Baylis
An infant with slowly progressive proptosis was found to have heterotopic
cerebellum in her left orbit. Although cerebellar cell rests are common, to
our knowledge none has been found previously in the orbit. It probably
arose either from abnormal germ cell migration or from aberrant germ cell
differentiation. Orbital heterotopia probably can be classified in the
larger category of orbital encephaloceles because of similarities in
presentation, clinical course, and treatment, although there can be
differences in the embryologic mechanisms of their development.
