[One of the variants of larvate cyclothymic disorder simulating pathology of the locomotor system].

Based on the reported data and the authors' findings 40 cases of larvate cyclothymia are described. The pivotal symptomatology of the disease involved masked hypochondriac subdepressions that imitated pathology of the bones and joints. In view of this fact the mental disease could not be recognized by the physicians and was diagnosed erroneously as a pathology of the bones and joints. The author provides a 3-component structure of the given hypochondriac depressions and differential diagnostic criteria for their separation from genuine pathology of the bones and joints.