Russell-Silver Syndrome, X-Linked
The possibility of an X-linked form was raised by Partington (1985) on the basis of the following observations: 2 brothers, aged 7 and 4, had prenatal growth retardation, triangular facies and cafe-au-lait (CAL) spots. Both had asthma. The mother was 160 cm tall and had CAL spots. Her 4 brothers were tall with no spots. Of her 5 sisters, 3 were over 168 cm tall and had no spots; 2 were 156 cm tall and had CAL spots. Partington (1985) suggested that this may represent X-linked inheritance with severe expression in males and mild expression in females. In the full report with illustrations (Partington, 1986), the pigmentary anomaly was presented as quite different from cafe-au-lait spots. The changes were progressive, starting at age 1 year in the younger child. Both pigmented and achromatic areas developed on the trunk and limbs sparing the face.