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Sarcopenia

Sarcopenia overview Sarcopenia is the gradual loss of muscle mass, strength and physical performance that happens with age. It affects your musculoskeletal system and can make everyday tasks — like climbing stairs or getting out of a chair — harder over time. As your muscles weaken, your risk of falls, fractures and loss of independence goes up. The definition of sarcopenia (pronounced “sar-ko-PEE-nee-uh”) focuses on how muscle loss affects your strength and ability to function. Experts generally define it using one or more key features: Low muscle mass Low muscle strength Low physical performance In some cases, sarcopenia occurs along with a higher body mass index (BMI). This combination, called sarcopenic obesity, can raise your risk of complications more than obesity or sarcopenia alone. In 2016, sarcopenia was recognized as a specific disease with an ICD-10-CM code. This step helped distinguish sarcopenia from other conditions that cause muscle loss and made it a reportable diagnos...
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X-linked Retinoschisis (XLRS)

X-linked Retinoschisis (XLRS)   overview X-linked Retinoschisis (XLRS) is a rare inherited genetic disease caused by RS1 gene mutations, predominantly affecting males and leading to early-onset vision loss due to splitting (schisis) in the retinal layers. It causes characteristic "spoke-wheel" macular cysts, typically presenting within the first decade of life with poor central vision, though peripheral vision can also be affected. Symptoms Reduced Visual Acuity: The primary symptom is a decline in central vision. "Uncorrectable" Vision: The vision loss cannot be corrected with eyeglasses. Macular Schisis: Almost all patients have a characteristic spoke-wheel pattern of cystic lesions in the macula (center of the retina). Peripheral Retinal Changes: About 50% of cases also experience peripheral vision loss, including the development of "vitreous veils". Structural Complications: Potential for retinal detachment and vitreous hemorrhage (bleeding), whic...
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Baraitser-Winter syndrome

Baraitser-Winter syndrome Overview Baraitser-Winter Cerebrofrontofacial (BWCFF) syndrome is a very rare genetic disorder (less than 100 reported cases) characterized by facial dysmorphism, brain malformations, and intellectual disability. Common symptoms include widely spaced eyes (hypertelorism), droopy eyelids (ptosis), high-arched eyebrows, and epilepsy. The condition is caused by heterozygous mutations in the ACTB or ACTG1 genes, which are essential for cellular structure and function. Symptoms Distinctive Craniofacial Features (100% frequency): Widely spaced eyes (hypertelorism). Droopy eyelids (bilateral ptosis). High-arched eyebrows. Broad nasal bridge and tip. Prominent metopic ridge (a ridge along the forehead). Pointed chin. Cleft lip/palate, although less common. Neurological and Developmental: Intellectual disability (mild to severe). Developmental delay. Brain malformations: Frontal pachygyria (thickened brain surface) or lissencephaly (smooth brain). Epilepsy/Seizures. Mu...
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Bare lymphocyte syndrome type I (BLS I)

Bare lymphocyte syndrome type I (BLS I)  Overview Bare lymphocyte syndrome type I (BLS I) is a rare, inherited primary immunodeficiency caused by a lack of Major Histocompatibility Complex (MHC) class I proteins on cell surfaces, leading to recurrent, severe bacterial infections, often in the lungs and airways. It is caused by genetic mutations, notably in  or genes, resulting in severe infections starting in childhood. According to the Immune Deficiency Foundation, management often requires diligent infection control and antibiotic treatment. Symptoms Recurrent Respiratory Infections: Frequent, severe bacterial infections in the lungs and airways (bronchitis, pneumonia, sinusitis) that often start in childhood. Bronchiectasis: Chronic lung damage, a common result of recurrent respiratory infections. Skin Lesions/Ulcers: Development of necrotic skin ulcers, often appearing in adolescence or young adulthood, typically on the face, arms, and legs. Chronic Infections: Increased ...
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X-linked hyper IgM syndrome

X-linked hyper IgM syndrome Overview X-linked hyper IgM syndrome (XHIGM, or HIGM1) is a rare primary immunodeficiency caused by mutations in the CD40LG gene on the X chromosome. Primarily affecting males, it causes low levels of IgG, IgA, and IgE, and normal/high IgM. This results in severe recurrent infections, often starting in infancy, with significant risk of opportunist infections, neutropenia, and liver disease, requiring lifelong treatment or  Symptoms Recurrent Infections: Infants often experience infections early in life, including pneumonia, sepsis, sinusitis, and otitis media. Opportunistic Infections: Susceptibility to unusual infections, particularly Pneumocystis jirovecii pneumonia (PCP) and Cryptosporidium diarrhea. Gastrointestinal Distress: Chronic diarrhea and liver disease, including sclerosing cholangitis, which may be caused by Cryptosporidium. Neutropenia: Intermittent or persistent low white blood cell count, often leading to mouth ulcers and skin infection...
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X-linked agammaglobulinemia (XLA)

X-linked agammaglobulinemia (XLA) Overview X-linked agammaglobulinemia (XLA), or Bruton's agammaglobulinemia, is a rare inherited immunodeficiency caused by mutations in the BTK gene, preventing B-cell maturation and resulting in very low antibody levels. Primarily affecting males, it leads to recurrent bacterial infections, commonly starting at 6-9 months old, requiring lifelong immunoglobulin replacement therapy. Symptoms Recurrent Infections: Frequent, persistent, or severe infections of the ears (otitis media), sinuses (sinusitis), nose (rhinitis), and lungs (pneumonia, bronchitis). Respiratory Infections: Bacterial pneumonia is common and, when it occurs in infants, is a strong indicator of XLA. Skin and Eye Infections: Abscesses, pyoderma, and conjunctivitis (pink eye). Gastrointestinal Issues: Chronic diarrhea, often due to a lack of IgA antibodies.  Serious Infections: Sepsis (blood poisoning), meningitis (spinal cord infection), and septic arthritis. Physical Findings :...
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X-Linked Adrenoleukodystrophy

X-Linked Adrenoleukodystrophy Overview X-linked adrenoleukodystrophy (ALD) is a rare genetic disorder that affects the white matter of the nervous system and the adrenal cortex. White matter is made up of nerve fibers called axons that relay nerve impulses from one cell to another. These nerve fibers are covered by myelin, an insulating layer or sheath that protects the nerve fibers. Myelin is made up of proteins and fats and gives white matter its white color. Without myelin, the signals between nerve cells cannot be transmitted properly, resulting in neurological symptoms. The adrenal cortex is the outer layer of cells of the adrenal glands. The adrenal glands sit atop the kidneys and produce hormones that are vital to proper health and development including cortisol and the sex hormones. Many of those affected experience serious neurological problems either during childhood or during adulthood with rather different types of disabilities. Some affected individuals also have adrenal i...
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