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| This glossary contains: 19186 medical terms |
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Conformational radiation therapy
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Conformational radiation therapyA procedure that uses computers to create a 3-dimensional picture of the tumor in order to target the tumor as accurately as possible and give it the highest possible dose of radiation while sparing normal tissue as much as possible. It is also known as 3-D or conformal radiation therapy. Conventional radiation therapy directs x-rays not only at the tumor but also unavoidably at nearby healthy tissue. Conformational radiation is meant to deliver a higher dose of radiation to the cancer without causing so much damage to surrounding tissues.
RELATED TERMS--------------------------------------
Tumor
Overgrowth of tissue.
Tissue
Biological tissue is a group of cells that perform a similar function.The study of tissues is known as histology, or, in connection with disease, histopathology.The classical tools for studying the tissues are the wax block, the tissue stain, and the optical microscope, though developments in electron microscopy, immunofluorescence, and frozen sections have all added to the sum of knowledge in the last couple of decades.
X-rays
Electromagnetic radiations that, because of their penetrating power, are used to record on film shadows of the varying densities within a part of the body.
Cancer
Any malignant growth or tumor caused by abnormal and uncontrolled cell division; it may spread to other parts of the body through the lymphatic system or the blood stream.
SIMILAR TERMS--------------------------------------
Confabulation
Fabrication of stories in response to questions about situations or events that are not recalled.
Conformal radiation therapy
A procedure that uses computers to create a 3-dimensional picture of the tumor in order to target the tumor as accurately as possible and give it the highest possible dose of radiation while sparing normal tissue as much as possible. It is also known as 3-D or conformational radiation therapy.
Confrontation
A communication that deliberately pressures or invites another to self-examine some aspect of behavior in which there is a discrepancy between self-reported and observed behavior.
PREVIOUS AND NEXT TERMS--------------------------------------
Condyloma latum
A manifestation of the secondary stage of syphilis that takes the form of broad flat wartlike growths in moist creased areas, as around the anus and external genitalia.
Condyloma subcutaneum
Molluscum contagiosum. Wartlike growths around the anus and genitals caused by a virus. Molluscum contagiosum is a contagious disease of the skin marked by the occurrence of soft rounded tumors of the skin caused by the growth of a virus belonging to the family Poxviridae. The disease is characterized by the appearance of few to numerous small, pearly, umbilicated downgrowths (the condyloma subcutaneum).
Cone dystrophy
A disease of the cones, the specialized light-sensitive cells that act as photoreceptors in the retina of the eye, providing sharp central vision and color vision. The cone dystrophies are a form of genetic macular degeneration characterized by progressive deterioration of the cones that leads to the distinctive triad of loss of color vision, photophobia, and reduced central vision. Cone dystrophy genes have been mapped to chromosome regions 6p21.1, 6q25-q26, 17p12-13, and Xp21.1-p11.3. In region 6p21.1, mutations have been found in the gene that encodes GCAP1, a key component in the recovery of photoreceptor cells to the dark-adapted state after exposure to a light stimulus.
Cone snail
A fishing-eating snail (Conidae) that inhabits tropical coral reefs and produces toxins that immobilize their prey.
Conformal radiation therapy
A procedure that uses computers to create a 3-dimensional picture of the tumor in order to target the tumor as accurately as possible and give it the highest possible dose of radiation while sparing normal tissue as much as possible. It is also known as 3-D or conformational radiation therapy.
Conformational radiation therapy
Congenital achromatopsia,
An hereditary disorder of vision characterized by a lack of cone vision (sight provided by the cone photoreceptors in the retina). People with achromatopsia (achromats) are completely or almost completely colorblind. They have poor visual acuity, and their eyes do not adapt normally to higher levels of illumination and are very light sensitive (photophobic). At higher levels of illumination, the vision of achromats decreases unless they make use of tinted lenses. In moderately bright indoor spaces or outdoors just after dawn or just before dusk, some achromats adapt to their reduced level of visual functioning without resorting to tinted lenses, by using visual strategies such as blinking, squinting, or positioning themselves in relation to the light source. Others routinely wear medium tinted lenses in such settings. In full sunlight outdoors or in very bright indoor spaces, almost all achromats use very dark tinted lenses to have a reasonable amount of vision, since their retinas do not possess the photoreceptors needed for seeing well in such settings.
Congenital anemia
1. Anemia at birth. 2. Synonym for Rh incompatibility.
Congenital anomaly
Something that is unusual or different at birth. A minor anomaly is defined as an unusual anatomic feature that is of no serious medical or cosmetic consequence to the patient. A minor anomaly of the feet might, for example, be curvature of the second toe so it overlaps the third toe a little.A major anomaly, by contrast, might be a cleft lip and palate, a birth defect of serious medical and cosmetic consequence to the child.
Congenital arthrogryposis
Nonprogressive congenital contractures that develop before birth and are evident at birth (congenital). The contractures are characterized by reduced mobility of many (multiple) joints. Congenital arthrogryposis is also called arthrogryposis multiplex congenita (AMC). In AMC the range of motion of the joints in the arms and legs is usually limited or fixed. Joints affected may include the shoulders, elbows, wrists and fingers and the hips, knees, ankles, and feet -- virtually any and all joints.
Congenital bilateral absence of vas deferens
A condition in males when the tubes that carry sperm from the testes (the vas deferens) fail to develop normally. The testes usually develop and function normally and the men have normal sexual performance, but sperm cannot be transported through the male reproductive system. Men with congenital bilateral absence of vas deferens are therefore infertile (unable to conceive a child). This condition is responsible for 2 to 5% of all infertility in men. Congenital bilateral absence of vas deferens is due to mutations in the CFTR gene (the cystic fibrosis transmembrane conductance regulator gene) which encodes a protein that functions as a channel across the cell membrane.
RELATED TERMS--------------------------------------
Tumor
Overgrowth of tissue.
Tissue
Biological tissue is a group of cells that perform a similar function.The study of tissues is known as histology, or, in connection with disease, histopathology.The classical tools for studying the tissues are the wax block, the tissue stain, and the optical microscope, though developments in electron microscopy, immunofluorescence, and frozen sections have all added to the sum of knowledge in the last couple of decades.
X-rays
Electromagnetic radiations that, because of their penetrating power, are used to record on film shadows of the varying densities within a part of the body.
Cancer
Any malignant growth or tumor caused by abnormal and uncontrolled cell division; it may spread to other parts of the body through the lymphatic system or the blood stream.
SIMILAR TERMS--------------------------------------
Confabulation
Fabrication of stories in response to questions about situations or events that are not recalled.
Conformal radiation therapy
A procedure that uses computers to create a 3-dimensional picture of the tumor in order to target the tumor as accurately as possible and give it the highest possible dose of radiation while sparing normal tissue as much as possible. It is also known as 3-D or conformational radiation therapy.
Confrontation
A communication that deliberately pressures or invites another to self-examine some aspect of behavior in which there is a discrepancy between self-reported and observed behavior.
PREVIOUS AND NEXT TERMS--------------------------------------
Condyloma latum
A manifestation of the secondary stage of syphilis that takes the form of broad flat wartlike growths in moist creased areas, as around the anus and external genitalia.
Condyloma subcutaneum
Molluscum contagiosum. Wartlike growths around the anus and genitals caused by a virus. Molluscum contagiosum is a contagious disease of the skin marked by the occurrence of soft rounded tumors of the skin caused by the growth of a virus belonging to the family Poxviridae. The disease is characterized by the appearance of few to numerous small, pearly, umbilicated downgrowths (the condyloma subcutaneum).
Cone dystrophy
A disease of the cones, the specialized light-sensitive cells that act as photoreceptors in the retina of the eye, providing sharp central vision and color vision. The cone dystrophies are a form of genetic macular degeneration characterized by progressive deterioration of the cones that leads to the distinctive triad of loss of color vision, photophobia, and reduced central vision. Cone dystrophy genes have been mapped to chromosome regions 6p21.1, 6q25-q26, 17p12-13, and Xp21.1-p11.3. In region 6p21.1, mutations have been found in the gene that encodes GCAP1, a key component in the recovery of photoreceptor cells to the dark-adapted state after exposure to a light stimulus.
Cone snail
A fishing-eating snail (Conidae) that inhabits tropical coral reefs and produces toxins that immobilize their prey.
Conformal radiation therapy
A procedure that uses computers to create a 3-dimensional picture of the tumor in order to target the tumor as accurately as possible and give it the highest possible dose of radiation while sparing normal tissue as much as possible. It is also known as 3-D or conformational radiation therapy.
Conformational radiation therapy
Congenital achromatopsia,
An hereditary disorder of vision characterized by a lack of cone vision (sight provided by the cone photoreceptors in the retina). People with achromatopsia (achromats) are completely or almost completely colorblind. They have poor visual acuity, and their eyes do not adapt normally to higher levels of illumination and are very light sensitive (photophobic). At higher levels of illumination, the vision of achromats decreases unless they make use of tinted lenses. In moderately bright indoor spaces or outdoors just after dawn or just before dusk, some achromats adapt to their reduced level of visual functioning without resorting to tinted lenses, by using visual strategies such as blinking, squinting, or positioning themselves in relation to the light source. Others routinely wear medium tinted lenses in such settings. In full sunlight outdoors or in very bright indoor spaces, almost all achromats use very dark tinted lenses to have a reasonable amount of vision, since their retinas do not possess the photoreceptors needed for seeing well in such settings.
Congenital anemia
1. Anemia at birth. 2. Synonym for Rh incompatibility.
Congenital anomaly
Something that is unusual or different at birth. A minor anomaly is defined as an unusual anatomic feature that is of no serious medical or cosmetic consequence to the patient. A minor anomaly of the feet might, for example, be curvature of the second toe so it overlaps the third toe a little.A major anomaly, by contrast, might be a cleft lip and palate, a birth defect of serious medical and cosmetic consequence to the child.
Congenital arthrogryposis
Nonprogressive congenital contractures that develop before birth and are evident at birth (congenital). The contractures are characterized by reduced mobility of many (multiple) joints. Congenital arthrogryposis is also called arthrogryposis multiplex congenita (AMC). In AMC the range of motion of the joints in the arms and legs is usually limited or fixed. Joints affected may include the shoulders, elbows, wrists and fingers and the hips, knees, ankles, and feet -- virtually any and all joints.
Congenital bilateral absence of vas deferens
A condition in males when the tubes that carry sperm from the testes (the vas deferens) fail to develop normally. The testes usually develop and function normally and the men have normal sexual performance, but sperm cannot be transported through the male reproductive system. Men with congenital bilateral absence of vas deferens are therefore infertile (unable to conceive a child). This condition is responsible for 2 to 5% of all infertility in men. Congenital bilateral absence of vas deferens is due to mutations in the CFTR gene (the cystic fibrosis transmembrane conductance regulator gene) which encodes a protein that functions as a channel across the cell membrane.
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This dictionary contains 19186 terms.
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