Hemimegalencephaly is a rare neurological condition in which one-half of the brain, or one side of the brain, is abnormally larger than the other. As a consequence of this imbalance, the unusual and enlarged brain tissue causes frequent seizures, usually followed with mental retardation. Hemimegalencephaly may occur as an isolated finding in an infant or it may be associated with other syndromes.
Hemiplegia is a condition in which one-half of a patient's body is paralyzed. Hemiplegia is more severe than hemiparesis, wherein one half of the body is weakened but not paralysed
A rare inherited form of migraine that characteristically causes temporary paralysis on one side of the body and involves the presence of an aura. A migraine episode may be triggered by minimal trauma to the head. The severity of the disorder is variable with some patients experiencing paralysis on one side of the body or coma for weeks.
Hemoglobinopathy is a group of disorders passed down through families (inherited) in which there is abnormal production or structure of the hemoglobin molecule. Such disorders include hemoglobin C disease, hemoglobin S-C disease, sickle cell anemia, and various types of thalassemia.
Alternative Names: Urine - hemoglobin Hemoglobin is a molecule attached to red blood cells that helps move oxygen and carbon dioxide through the body. Red blood cells have an average life span of 120 days. After this time, they are broken down into parts that can make a new red blood cell. This typically takes place in the spleen, bone marrow, and liver. If the red blood cells break down the blood vessels, their parts move freely in the bloodstream. If the level of hemoglobin in the blood rises too high, then hemoglobin begins to appear in the urine. This is called hemoglobinuria. This article focuses on the urine test done to diagnose hemoglobinuria.
Hemolytic anemia, lethal - genital anomalies: A very rare syndrome characterized mainly by genital abnormalities and hemolytic anemia which often causes death.
Hemolytic disease of the fetus and newborn (HDFN) is a blood disorder that causes your baby’s red blood cells to break down quickly. When red blood cells break down it is called hemolysis.
Hemolytic disease of the fetus and newborn (HDFN) is a blood disorder that causes your baby’s red blood cells to break down quickly. When red blood cells break down it is called hemolysis. Hemolysis causes anemia (low number of red blood cells) and jaundice (an increased bilirubin level) during the first few days to weeks of your baby’s life. Severe anemia can cause critical illness since it is harder to deliver oxygen throughout the body. This type of severe jaundice can lead to hearing problems/deafness and brain damage if left untreated. HDFN occurs when there is a mismatch between the mother’s and baby’s blood type and/or Rh factor during pregnancy.
Hemolytic uremic syndrome, atypical, childhood: A rare disorder involving destruction of blood cells and kidney disease. Unlike typical hemolytic uremic syndrome which usually follows a bacterial infection, the atypical form is possibly a genetic disorder. The distinguishing feature of the atypical form is that no diarrhea is involved. The atypical form has a poorer prognosis than the typical form.
Hemolytic uremic syndrome HUS is a condition caused by the abnormal destruction of red blood cells. The damaged red blood cells clog the filtering system in the kidneys, which can lead to life-threatening kidney failure.
HUS usually develops in children after five to 10 days of diarrhea, often bloody, caused by infection with certain strains of Escherichia coli (E. coli) bacteria. Adults also can develop HUS due to E. coli or other types of infection, certain medications, or pregnancy. HUS is a serious condition. But timely and appropriate treatment leads to a full recovery for most people, especially young children.
Hemolytic uremic syndrome should be distinguished from atypical hemolytic uremic syndrome (aHUS). The two conditions have different causes and different signs and symptoms.
Hemophagocytic lymphohistiocytosis (HLH), is an uncommon hematologic disorder. It is a life-threatening disease of severe hyperinflammation caused by uncontrolled proliferation of activated lymphocytes and macrophages characterised by proliferation of morphologically benign lymphocytes and macrophages that secrete high amounts of inflammatory cytokines. It is classified as one of the cytokine storm syndromes.
Hemophagocytic lymphohistiocytosis, familial, 2: A rare recessively inherited disorder involving an overactive immune system. More specifically, the body becomes infiltrated by large numbers of histiocytes (macrophages) that accumulate in various organs such as the liver, spleen, bone marrow, skin and central nervous system. It usually only occurs in infants and young children. Type 2 is caused by a defect on chromosome 10q22.
Hemophagocytic lymphohistiocytosis, familial, 3: A rare recessively inherited disorder involving an overactive immune system. More specifically, the body becomes infiltrated by large numbers of histiocytes (macrophages) that accumulate in various organs such as the liver, spleen, bone marrow, skin and central nervous system. It usually only occurs in infants and young children. Type 3 is caused by a defect on chromosome 17q25.1.
Hemophagocytic lymphohistiocytosis, familial, 4: A rare recessively inherited disorder involving an overactive immune system. More specifically, the body becomes infiltrated by large numbers of histiocytes (macrophages) that accumulate in various organs such as the liver, spleen, bone marrow, skin and central nervous system. It usually only occurs in infants and young children. Type 4 is caused by a defect on chromosome 6q24.
Hemophagocytic reticulosis: The abnormal proliferation of reticulum cell (histiocytes) which infiltrate various organs and. Macrophages destroy blood cells causing blood abnormalities. Meningoencephalitis frequently occurs when the histiocytes infiltrate the mininges and cerebral tissue. Symptoms start at birth or soon after and become progressively worse without treatment. Medication can control the condition but a hematopoietic stem cell transplant is needed to achieve remission.
Hemophilia A is a bleeding disorder in which the blood does not clot normally. People with this disorder have prolonged bleeding or oozing after an injury, surgery, or tooth extraction. In severe cases, heavy bleeding occurs after minor injury or even when there is no injury (spontaneous bleeding). Serious complications can result from bleeding into the joints, muscles, brain, or other internal organs. In milder forms there is no spontaneous bleeding, and the disorder may not become apparent until after a surgery or serious injury.
The major types of this condition are hemophilia A (also known as classic hemophilia or factor VIII deficiency) and hemophilia B (also known as Christmas disease or factor IX deficiency). Although the two types have very similar signs and symptoms, they are caused by mutations in different genes.
Hemophilia is a rare inherited blood clotting (coagulation) disorder caused by inactive or deficient blood proteins (usually factor VIII). Factor VIII is one of several proteins that enable the blood to clot. Hemophilia may be classified as mild, moderate, or severe. The level of severity is determined by the percentage of active clotting factor in the blood (normal percentage ranges from 50 to 150 percent). People who have severe hemophilia have less than one percent of active clotting factor in their blood. hemophilia A (also known as classical hemophilia, factor VIII deficiency or antihemophilic globulin [AHG] deficiency);
Hemophilia is a bleeding disorder that slows the blood clotting process. People with this condition experience prolonged bleeding or oozing following an injury, surgery, or having a tooth pulled. In severe cases of hemophilia, continuous bleeding occurs after minor trauma or even in the absence of injury (spontaneous bleeding). Serious complications can result from bleeding into the joints, muscles, brain, or other internal organs. Milder forms of hemophilia do not necessarily involve spontaneous bleeding, and the condition may not become apparent until abnormal bleeding occurs following surgery or a serious injury.
The major types of this condition are hemophilia A (also known as classic hemophilia or factor VIII deficiency) and hemophilia B (also known as Christmas disease or factor IX deficiency). Although the two types have very similar signs and symptoms, they are caused by mutations in different genes. People with an unusual form of hemophilia B, known ashemophilia B Leyden, experience episodes of excessive bleeding in childhood but have few bleeding problems after puberty.
Hemophilic arthropathy: Joint destruction associated with hemophilia. The knees, ankles, elbows, hip and shoulders are the most common joints involved. Symptoms are progressive and often surgical intervention is required to prevent total loss of joint function.
Hemorrhagic fevers also called Viral hemorrhagic fevers (VHFs) are a diverse group of animal and human illnesses in which fever and hemorrhage are caused by a viral infection. VHFs may be caused by five distinct families of RNA viruses: the families Arenaviridae, Filoviridae, Bunyaviridae, Flaviviridae, and Rhabdoviridae. All types of VHF are characterized by fever and bleeding disorders and all can progress to high fever, shock and death in many cases. Some of the VHF agents cause relatively mild illnesses, such as the Scandinavian nephropathia epidemica (a Hantavirus), while others, such as Ebola virus, can cause severe, life-threatening disease.
Hemorrhagic proctocolitis: Inflammation of the rectum and colon that results in bleeding.
Hemorrhagic shock and encephalopathy syndrome: A very rare severe condition characterized by sudden severe shock, brain disease and liver and kidney dysfunction which occurs in infants. The cause is unknown.
Hemorrhagic thrombocythemia: A rare blood disorder characterized by increased number of platelets in the blood which often results in an enlarged spleen, bleeding and blood vessel blockages.
Hemorrhagiparous thrombocytic dystrophy (medical condition): A rare inherited blood coagulation disorder caused by blood platelet abnormalities which results in easy bruising and excessive bleeding. Hemorrhagiparous thrombocytic dystrophy: Another name for Bernard-Soulier Syndrome (or close medical condition association).
Hemosiderosis: A rare lung condition where bleeding into the lungs causes lung damage due to the accumulation of iron. The severity of the condition is determined by the amount of bleeding.
Hendra virus (formerly called equine morbillivirus) is a member of the family Paramyxoviridae. The virus was first isolated in 1994 from specimens obtained during an outbreak of respiratory and neurologic disease in horses and humans in Hendra, a suburb of Brisbane, Australia.
Hennekam-Beemer syndrome (medical condition): A very rare syndrome characterized mainly by short stature, abnormal skin pigmentation, small ears and hearing impairment. Hennekam-Beemer syndrome: Another name for Mastocytosis, cutaneous, with short stature, conductive hearing loss and microtia (or close medical condition association).
Hennekam koss de geest syndrome (medical condition): A very rare syndrome characterized mainly by reduced muscle tone, short stature and contractures. Hennekam koss de geest syndrome: Another name for Short stature - contractures - hypotonia (or close medical condition association). Short stature - contractures - hypotonia: A very rare syndrome characterized mainly by reduced muscle tone, short stature and contractures.
Hennekam lymphangiectasia lymphedema syndrome (medical condition): A rare disorder characterized by buildup of lymphatic fluid in the limbs, face and genitals, seizures and mental and growth retardation. Hennekam lymphangiectasia lymphedema syndrome: Another name for Lymphangiectasies and lymphedema Hennekam type (or close medical condition association). Lymphangiectasies and lymphedema Hennekam type: A rare disorder characterized by buildup of lymphatic fluid in the limbs, face and genitals, seizures and mental and growth retardation.
Hennekam syndrome is an inherited disorder resulting from malformation of the lymphatic system, which is part of both the circulatory system and immune system. The lymphatic system consists of a network of vessels that transport lymph fluid and immune cells throughout the body.