Three cases of behavioral disorders in children previously treated for
a diencephalic tumor are reported. In such cases, classical psychiatr
ic evaluation is difficult because reference data on childhood psychoo
rganic syndromes are lacking. Another complicating feature is that mul
tiple factors contribute to the impairment of social interactions, inc
luding maladaptive reactions to disease-related stress, sensory defici
ts, and cognitive disorders. A structured evaluation should be perform
ed in order to assess the child's behavior, the psychological and educ
ational environment, and impairment of neuropsychological and neurophy
siological function.