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Microcephalic primordial dwarfism, Montreal type is a rare, genetic multiple congenital anomalies/dysmorphic syndrome characterized by severe short stature and craniofacial dysmorphism (microcephaly, narrow face with flat cheeks, ptosis, prominent nose with a convex ridge, low-set ears with small or absent lobes, high-arched/cleft palate, micrognathia), associated with premature graying and loss of scalp hair, redundant, dry and wrinkled skin of the palms, premature senility and varying degrees of intellectual disability. Cryptorchidism and skeletal anomalies may also be observed. There have been no further descriptions in the literature since 1970.
Features include: Narrow face, Severe short stature, Excessive wrinkling of palmar skin, and Alopecia of scalp and 8 more.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Skin | 2 | Excessive wrinkling of palmar skin, Alopecia of scalp |
Brain and nerves |
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
Data assembled from 4 of 12 sources · Last updated Sep 17, 2026, 7:19 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
2 |
Cerebral hypoplasia, Intellectual disability |
Head and neck | 1 | Narrow face |
Growth and development | 1 | Severe short stature |
Eyes | 1 | Ptosis |