Multicystic bone disease (Gorham-Stout syndrome) in a spider monkey (Ateles geoffroyi ).

Background: In April 2000, a 2.5-year-old pet female Geoffroyi's spider monkey presented for reduced activity, a subdued demeanor, and boney enlargement involving both radii.

Methods: On further examination, polyostotic bone cysts were identified involving many of the tubular bones and were identified radiographically.