Chromosome 3 en anneau chez un adulte nain et retardé mental.

A 46-year-old man with mental retardation, growth failure and some dysmorphic features is found to have a 46,XX,r(3)(p26q29) caryotype in 93% of his peripheral lymphocytes. This observation is compared with previously cases of ring 3. The existence of a «ring syndrome» is considered