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Microcephaly (from Neo-Latin microcephalia, from Ancient Greek μικρός mikrós "small" and κεφαλή kephalé "head" [2]) is a medical condition involving a smaller-than-normal head. [3] Microcephaly may be present at birth or it may develop in the first few years of life. [3]
Symptoms include: [5] intellectual disability (more than half of the patients have an IQ below 50) microcephaly; sometimes pancytopenia (low blood counts) cryptorchidism in males; low birth weight; dislocations of pelvis and elbow; unusually large eyes; blindness or visual impairment; large, low-set ears; small chin due to receded lower jaw
Lenz microphthalmia syndrome is inherited as an X-linked recessive genetic trait and is fully expressed in males only. Females who carry one copy of the disease gene (heterozygotes) may exhibit some of the symptoms associated with the disorder, such as an abnormally small head (microcephaly), short stature, or malformations of the fingers or toes.
Achalasia microcephaly; Chest x-ray of an individual with achalasia. The arrows point to the areas of extreme esophageal dilation. Symptoms: Manifestation of achalasia: regurgitation, vomiting and dysphagia, alongside diagnosis of microcephaly: abnormally small head size below the third percentile as well as mild to moderate mental retardation.
Amish lethal microcephaly is a rare genetic disorder which is characterized by severe microcephaly (small head) from birth, brain hypoplasia (underdeveloped brain), micrognathia (small chin), irritability (at second or third month of age), seizures, problems controlling their body temperature, high levels of alpha-ketogluraic acid in their urine, [2] and less commonly hepatomegaly (large liver).
Other features of Pitt-Hopkins syndrome may include constipation and other gastrointestinal problems, an unusually small head (microcephaly), nearsightedness (myopia), eyes that do not look in the same direction (strabismus), short stature, and minor brain abnormalities [12] Adults who have PTHS may have trouble with their speech. [10]
Microlissencephaly (MLIS) is a rare congenital brain disorder that combines severe microcephaly (small head) with lissencephaly (smooth brain surface due to absent sulci and gyri). Microlissencephaly is a heterogeneous disorder , i.e. it has many different causes and a variable clinical course. [ 1 ]
Macrocephaly is a condition in which circumference of the human head is abnormally large. [1] It may be pathological or harmless, and can be a familial genetic characteristic. . People diagnosed with macrocephaly will receive further medical tests to determine whether the syndrome is accompanied by particular disorde