| Term | Definition | 
|---|---|
| Cardiomyopathy | disease in which the heart muscle becomes inflamed and doesn't work as well as it should. | 
| Cataract | clouding of the lens of the eye. | 
| CBC and differential | determination of the quantity of each type of blood cell in a given sample of blood. Blood differential test measures the percentage of each type of white blood cell. | 
| Cellulitis | inflammation or infection of the skin causing redness, swelling and tenderness | 
| Cephalopelvic disproportion (CPD) | baby's head or body is too large to fit through the mother’s pelvis. | 
| Cerebral Palsy | group of chronic neurological symptoms causing impaired control of movement, diagnosed usually before age 3. | 
| CGH (Micro-Array) | comparative genomic hybridization is a high resolution genetic blood test using an array containing many DNA samples to determine the expression levels of hundreds or thousands of genes within a cell. This technology has most commonly been used to detect chromosomal abnormalities. | 
| Chorea | abnormal involuntary movement disorder, one of a group of neurological disorders called dyskinesias. | 
| Chronic bronchitis | inflammation of the bronchial tubes resulting in excessive secretions of mucus into the tubes, leading to tissue swelling that can narrow or close off bronchial tubes. | 
| Chronic constipation | infrequent bowel movements or straining and difficulty passing stools. | 
| Chronic diarrhea | one or more loose stools per day for approximately four consecutive weeks. | 
| Chylous reflux | swelling and skin lesions, usually of the lower limbs of the body. | 
| Cleft lip | one or two vertical fissures (clefts) in the upper lip; can be on one side only (unilateral) or on both sides (bilateral). | 
| Cleft palate | opening in the roof of the mouth (the palate) | 
| Clonic seizures | seizures defined by rhythmic jerking movements of the arms and legs, sometimes on both sides of the body. | 
| Coarctation of the aorta | narrowing of the aorta, the large blood vessel that branches off your heart and delivers oxygen-rich blood to your body. | 
| Colonoscopy | internal examination of the colon (large intestine) and rectum, using an instrument called a colonoscope. Typically requires sedation | 
| Color blindness (color deficiency) | Difficulty discriminating between colors, typically red and green. | 
| Commando Crawl | crawl using only the arms | 
| Complement screening | blood test that measures the quantity or activity of complement proteins in the blood. | 
| Complex partial seizures | type of partial seizure associated with disease of the temporal lobe and characterized by varying degrees of impairment of consciousness and automatisms, for which the patient is later amnestic. | 
| Compression garments/bandages | panty hose and other clothes that compress the limbs or torso. | 
| Compression Pump | massaging sleeve used to decrease swelling in the arms or legs caused by certain conditions, such as lymphedema. | 
| Computed tomography (CT) | computerized x-ray to make 3D images of inside the body. | 
| Conduct disorder | a behavioral and emotional disorder of childhood and adolescence. Children with conduct disorder act inappropriately, infringe on the rights of others, and violate the behavioral expectations of others. | 
| Congenital abnormality | body defect that exists at birth. | 
| Congenital heart disease | heart defect that exists at birth. | 
| Corpus callosotomy | surgery to cut the nerve fibers that run between the two halves of the brain. Usually done to manage severe epilepsy. | 
| Cortical Vision Impairment | vision loss due to brain damage, not eye problems. | 
| CPAP | Continuous Positive Airway Pressure. CPAP is air pressure applied with a mask to keep the airways open, usually to aid sleep. | 
| CT Scan | computerized imaging technique that uses X-rays to create a 3-dimentional image of the body. Often used to look at the head, chest, abdomen (stomach and intestines), or bones. | 
| Cyanosis | blueish discoloration of the skin due to poor circulation. Often seen on the hands, feet and around the mouth. | 
| Cyclic Vomiting | sudden repeated attacks of severe vomiting that can last from hours to days | 
| Cysts/blisters | internal round, soft, fluid-filled pockets that either be close to skin or inside organs (body parts) like brain and kidneys. | 
| Debulking/ radical surgical procedures | surgical procedure used to reduce the amount of abnormal tissue but not necessarily completely remove it. Often used when a malignant tumor cannot be completely removed because of its location. | 
| Deep Tendon Reflexes | involuntary jerks produced when certain spots on the limbs are tapped with a rubber hammer | 
| Deep-seated infections including septice | serious infection involving the inside of the body. Can affect the blood (septicemia) or specific organs (like the liver, kidneys, etc). | 
| Dehydration | significant loss of fluid (can result from diarrhea or vomiting) | 
| Delayed Myelination | sheath that covers the nerve fibers which did not form at the usual stage of development | 
| Dental antibiotic prophylaxis | routine use of antibiotics before a dental procedure. Often used for people who have artificial materials, implants or prosthetic devices in their body (hip replacement, heart valves, etc) | 
| Depth perception problems | difficulty using both eyes together to judge depths or distances. Often due to strabismus, lazy eye or an injured eye. | 
| Diabetes insipidus (vasopressin deficien | condition where the kidneys are not able to conserve water and there is excess urination. it is often due to an abnormality or lack of a hormone called vasopressin. | 
| Diet controlled | use of nutrition and food to control disease. Often used to describe the ability to control blood sugar (diabetes) by eating the proper low-sugar foods or reducing salt intake to lower blood pressure. | 
| Dilated Renal Pelvis | outlet of the kidney is enlarged where urine is passed into the ureter | 
| Distichiasis syndrome | abnormal growth of eyelashes which can often rub on the inside of the eye. May occur alone or with other eyelid problems. | 
| Dolicocephaly | a long, narrow head | 
| Doppler/Duplex studies | ultrasound that measures blood flow and pressure in blood vessels. | 
| Downslanting Palpebral Fissures | eye opening appears slanted downwards from the inner corner of the eye to the outer corner of the eye | 
| Drainage of ascitic fluid | removal of excess fluid in the abdomen (stomach) by use of a large needle and syringe. | 
| DTaP vaccine | 3 vaccines combined into one injection. protects against diphtheria, tetanus and pertussis. It's given as a series of 5 shots over a number of years. |