Primrose syndrome is characterized by macrocephaly, hypotonia, developmental delay, intellectual disability with expressive speech delay, behavioral issues, a recognizable facial phenotype, radiographic features, and altered glucose metabolism. Additional features seen in adults: sparse body hair, distal muscle wasting, and contractures. Characteristic craniofacial features include brachycephaly, high anterior hairline, deeply set eyes, ptosis, downslanted palpebral fissures, high palate with torus palatinus, broad jaw, and large ears with small or absent lobes. Radiographic features include calcification of the external ear cartilage, multiple Wormian bones, platybasia, bathrocephaly, slender bones with exaggerated metaphyseal flaring, mild epiphyseal dysplasia, and spondylar dysplasia. Additional features include hearing impairment, ocular anomalies, cryptorchidism, and nonspecific findings on brain MRI.

ITM2B-related cerebral amyloid angiopathy-2, also known as familial Danish dementia (FDD), is an autosomal dominant neurodegenerative disorder characterized by the progressive development of cataracts and other ocular disorders including ocular hemorrhages, hearing impairment, varying neurologic symptoms, and dementia, usually associated with paranoid reactions and temporal disturbance of consciousness. Most patients die in the fifth to sixth decade of life. Neuropathologic findings include severe widespread cerebral amyloid angiopathy, hippocampal plaques, and neurofibrillary tangles, similar to Alzheimer disease (see 104300) (summary by Vidal et al., 2000).

Mutations in the EPHA2 gene have been found to cause multiple types of cataract, which have been described as posterior polar, congenital total, complete, and age-related cortical. The preferred title/symbol of this entry was formerly 'Cataract, posterior polar, 1; CTPP1,' and 'Cataract, Age-Related Cortical, 2; ARCC2' was formerly a distinct entry.

Mutations in the VIM gene have been found to cause multiple types of congenital cataract, which have been described as congenital, pulverulent, and posterior polar.

Mutations in the CRYAB gene have been found to cause multiple types of cataract, which have been described as congenital posterior polar, congenital lamellar, and juvenile. Autosomal dominant and autosomal recessive forms have been described. The preferred title/symbol of this entry was formerly 'Cataract, Posterior Polar, 2; CTPP2.'

Any retinitis pigmentosa in which the cause of the disease is a mutation in the BBS2 gene.