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Aplasia of the ulna is a rare malformation of the forearm. A woman patient with such malformation was presented in our clinic on the occasion of a banal dream. In addition to ulnar aplasia, her entire ulnolateral hand was missing. This findings is compared with the relatively few cases described in literature, reporting on the forms of ulnar aplasia observed so far and their additional local malformation. Assumptions regarding the possible origin of such malformations are mentioned, the combined malformations in other body regions as mentioned in literature are described, and brief reference is made to methods of treatment.