Primordial dwarfism (PD) is a form of dwarfism that results in a smaller body size in all stages of life beginning from before birth. More specifically, primordial dwarfism is a diagnostic category including specific types of profoundly proportionate dwarfism, in which individuals are extremely small for their age, even as a fetus. Most Specialty: Medical genetics.
In people with Majewski osteodysplastic primordial dwarfism Type II (MOPDII), which is one of the five genetic disorders that are currently grouped under primordial dwarfism, adult brain size is about that of a 3-month-old infant. However, this typically doesn't affect intellectual development.
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Aug 23, 2019 · Achondroplasia, which is by far the most common form of dwarfism and accounts for 70 percent of cases, is a genetic disorder that causes overproduction of a protein involved in the regulation of bone growth called fibroblast growth factor receptor three. The excess interferes with bone development, resulting in disproportionately short arms and legs, an average adult height of 4 feet 3.5.