Syringomyelia (Sear-IN-Joe-My-E-Lee-Uh), or "SM", is a chronic disorder of the spinal cord which consists of the formation of a syrinx (a pocket of cerebral-spinal fluid sometimes referred to as a...

Under the name of common variable immunodeficiency (CVID) are enclosed a group of disorders of the immune system with different underlying causes but similar symptoms. This syndrome is character...

Antisynthetase syndrome is a rare, chronic, inflammatory autoimmune disorder that affects the muscles and other parts of the body. An autoimmune disorder is one where the body’s own immune...

Darier disease, also known as keratosis follicularis, is a rare genetic disorder of the skin. It is characterized by skin lesions that consist of thickened, scaly bumps which can be yellow or br...

Adrenomyeloneuropathy (AMN) is a rare inherited metabolic disorder that affects approximately 30,000 people worldwide.

Fibromyalgia is a disorder characterized by the core symptoms of chronic widespread pain and tenderness, fatigue, sleep disturbance and cognitive disturbance. The severity of each differs betwee...

Systemic Capillary Leak Syndrome (SCLS) is an exceedingly rare, life- and limb-threatening disorder characterized by acute and severe recurrent attacks featuring a rapid fall in blood pressure d...

Birdshot Chorioretinopathy is a rare inflammatory ocular disorder characterized by severe inflammation of both the choroid and retina. The disorder is thought to be an autoimmune condition.

Chromosome 4q Deletion Syndrome is a rare chromosomal disorder in which there is deletion of a portion of the 4th chromosome.

Addison´s disease is a rare endocrine or hormonal disorder characterized by a diminished production of hormones by the adrenal glands, two small orga...

Dent disease is a rare X-linked recessive, chronic kidney condition found almost exclusively in males. The severity of the disease and the specific symptoms can vary. Females, who can be carrier...

Adrenoleukodystrophy is a rare disease characterized by progressive brain damage and failure of the adrenal glands.

Muckle-Wells syndrome (MWS) is an hereditary autoinflammatory disease with periodic fevers caused by mutations in the NLRP3 gene. It is considered a cryopyrin-associated syndrome (CAPS)...

Microduplication 22q11.2 syndrome is caused by an extra copy of a small piece of chromosome 22 at location q11.2.

Chromosome 13q deletion is a rare genetic disorder in which a piece of genetic material from the long arm (q) of one of the two chromosome 13s is missing. The symptoms and severity of the disord...

Blastic plasmacytoid dendritic cell neoplasm (BPDCN) is a rare cancer that affects certain cells of the immune system called dendritic cells. The immune system is the natural defense of the body...

15q26 deletion is a genetic condition in which a small piece of DNA (genetic material) is missing from one of the 46 chromosomes, specifically from the q (long arm) of chromosome 15.  Depen...

Perineural (or Tarlov) cysts are cerebrospinal fluid-filled nerve root cysts most commonly found at the sacral level of the spine, although they can be found in any section of the spine, which can ...

Large granular lymphocyte leukemia or LGLL is a rare cancer of a type of white blood cells called lymphocytes. Lymphocytes are part of the immune system, the natural defense of the body that hel...

Each human cell stores its genetic material (DNA) in chromosomes. All normal human cells have 23 pairs of chromosomes with the exception of sperm or egg cells that have 23 single chromosomes. Al...