Multiple pterygium syndrome lethal type
is a very rare genetic condition affecting the skin, muscles and skeleton. It is characterized by minor facial abnormalities, prenatal growth deficiency, spine defects, joint contractures, and webbing (pterygia) of the neck, elbows, back of the knees, armpits, and fingers. Fetuses with this condition are usually not born. Some of the prenatal complications include cystic hygroma, hydrops, diaphragmatic hernia, polyhydramnios, underdevelopment of the heart and lungs, microcephaly, bone fusions, joint dislocations, spinal fusion, and bone fractures. Both X-linked and autosomal recessive inheritance have been proposed. Mutations in the CHRNG, CHRNA1, and CHRND genes have been found to cause this condition. Source: Genetic and Rare Diseases Information Center (GARD), supported by ORDR-NCATS and NHGRI.