Hydrops-ectopic calcification-"moth-eaten" (HEM) or Greenberg's skeletal dysplasia is an autosomal recessive chondrodystrophy with a lethal course, characterized by fetal hydrops, short limbs, and abnormal chondro-osseous calcification.
Etiology
3beta-hydroxysterol delta(14)-reductase deficiency due to mutations in the LBR gene coding for lamin B receptor gene.