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• Cachexia
• CADASIL
• Cadaver
• Cafe-au-Lait Spots
• Calcinosis
• Calciphylaxis
• Calcium Metabolism Disorders
• Calculi
• Caliciviridae Infections
• Campylobacter Infections
• Canavan Disease
• Cancer Pain
• Candidemia
• Candidiasis
• Candidiasis, Chronic Mucocutaneous
• Candidiasis, Invasive
• Candidiasis, Oral
• Candidiasis, Vulvovaginal
• Capsule Opacification
• Carbamoyl-Phosphate Synthase I Deficiency Disease
• Carbohydrate Metabolism, Inborn Errors
• Carbon Monoxide Poisoning
• Carcinogenesis
• Carcinoid Heart Disease
• Carcinoid Tumor
• Carcinoma
• Carcinoma in Situ
• Carcinoma, Acinar Cell
• Carcinoma, Adenoid Cystic
• Carcinoma, Adenosquamous
• Carcinoma, Basal Cell
• Carcinoma, Bronchogenic
• Carcinoma, Ductal
• Carcinoma, Ductal, Breast
• Carcinoma, Embryonal
• Carcinoma, Endometrioid
• Carcinoma, Hepatocellular
• Carcinoma, Intraductal, Noninfiltrating
• Carcinoma, Islet Cell
• Carcinoma, Large Cell
• Carcinoma, Lobular
• Carcinoma, Medullary
• Carcinoma, Merkel Cell
• Carcinoma, Mucoepidermoid
• Carcinoma, Neuroendocrine
• Carcinoma, Non-Small-Cell Lung
• Carcinoma, Ovarian Epithelial
• Carcinoma, Pancreatic Ductal
• Carcinoma, Papillary
• Carcinoma, Papillary, Follicular
• Carcinoma, Renal Cell
• Carcinoma, Signet Ring Cell
• Carcinoma, Skin Appendage
• Carcinoma, Small Cell
• Carcinoma, Squamous Cell
• Carcinoma, Transitional Cell
• Carcinoma, Verrucous
• Carcinosarcoma
• Cardiac Complexes, Premature
• Cardiac Conduction System Disease
• Cardiac Output, High
• Cardiac Output, Low
• Cardio-Renal Syndrome
• Cardiomegaly
• Cardiomyopathies
• Cardiomyopathy, Alcoholic
• Cardiomyopathy, Dilated
• Cardiomyopathy, Hypertrophic
• Cardiomyopathy, Hypertrophic, Familial
• Cardiotoxicity
• Cardiovascular Abnormalities
• Cardiovascular Diseases
• Caregiver Burden
• Carney Complex
• Carotid Artery Diseases
• Carotid Artery Injuries
• Carotid Artery, Internal, Dissection
• Carotid Body Tumor
• Carotid Stenosis
• Carpal Tunnel Syndrome
• Cartilage Diseases
• Castleman Disease
• Cat-Scratch Disease
• Cataplexy
• Cataract
• Catatonia
• Catheter-Related Infections
• Causalgia
• Celiac Disease
• Cell Transformation, Neoplastic
• Cellulite
• Cellulitis
• Central Nervous System Diseases
• Central Nervous System Fungal Infections
• Central Nervous System Infections
• Central Nervous System Neoplasms
• Central Nervous System Vascular Malformations
• Central Serous Chorioretinopathy
• Cerebellar Ataxia
• Cerebellar Diseases
• Cerebral Amyloid Angiopathy
• Cerebral Amyloid Angiopathy, Familial
• Cerebral Arterial Diseases
• Cerebral Hemorrhage
• Cerebral Hemorrhage, Traumatic
• Cerebral Infarction
• Cerebral Palsy
• Cerebral Small Vessel Diseases
• Cerebral Ventriculitis
• Cerebrospinal Fluid Leak
• Cerebrospinal Fluid Rhinorrhea
• Cerebrovascular Disorders
• Cervical Intraepithelial Neoplasia
• Chagas Cardiomyopathy
• Chagas Disease
• Chalazion
• Chancre
• Charcot-Marie-Tooth Disease
• Chediak-Higashi Syndrome
• Cheilitis
• Chemical and Drug Induced Liver Injury
• Chemical and Drug Induced Liver Injury, Chronic
• Chemically-Induced Disorders
• Chemotherapy-Induced Febrile Neutropenia
• Chemotherapy-Related Cognitive Impairment
• Chest Pain
• Cheyne-Stokes Respiration
• Chickenpox
• Chikungunya Fever
• Child Behavior Disorders
• Child Development Disorders, Pervasive
• Child Nutrition Disorders
• Childhood-Onset Fluency Disorder
• Chills
• Chlamydia Infections
• Chlamydial Pneumonia
• Choanal Atresia
• Cholangiocarcinoma
• Cholangitis
• Cholangitis, Sclerosing
• Cholecystitis
• Cholecystitis, Acute
• Cholecystolithiasis
• Choledochal Cyst
• Choledocholithiasis
• Cholelithiasis
• Cholera
• Cholestasis
• Cholestasis, Extrahepatic
• Cholestasis, Intrahepatic
• Cholesteatoma
• Cholesterol Ester Storage Disease
• Chondroblastoma
• Chondrocalcinosis
• Chondroma
• Chondromalacia Patellae
• Chondrosarcoma
• Chondrosarcoma, Clear Cell
• Chondrosarcoma, Mesenchymal
• Chordoma
• Chorea
• Chorioamnionitis
• Choriocarcinoma
• Chorioretinitis
• Choroid Diseases
• Choroid Plexus Neoplasms
• Choroidal Effusions
• Choroidal Neovascularization
• Choroideremia
• Choroiditis
• Chromosomal Instability
• Chromosome Aberrations
• Chromosome Deletion
• Chromosome Disorders
• Chronic Cough
• Chronic Disease
• Chronic Exertional Compartment Syndrome
• Chronic Inducible Urticaria
• Chronic Kidney Disease-Mineral and Bone Disorder
• Chronic Pain
• Chronic Periodontitis
• Chronic Traumatic Encephalopathy
• Chronic Urticaria
• Chronobiology Disorders
• Churg-Strauss Syndrome
• Chylothorax
• Cicatrix
• Cicatrix, Hypertrophic
• Ciguatera Poisoning
• Ciliary Motility Disorders
• Citrullinemia
• Cleft Lip
• Cleft Palate
• Clinical Deterioration
• Clostridium Infections
• Clubfoot
• Cluster Headache
• Coagulation Protein Disorders
• Cocaine-Related Disorders
• Coccidioidomycosis
• Coccidiosis
• Cockayne Syndrome
• Cognition Disorders
• Cognitive Dysfunction
• Coinfection
• Cold Urticaria
• Colic
• Colitis
• Colitis, Collagenous
• Colitis, Lymphocytic
• Colitis, Microscopic
• Colitis, Ulcerative
• Collagen Diseases
• Collagenous Sprue
• Colles' Fracture
• Colonic Diseases
• Colonic Diseases, Functional
• Colonic Neoplasms
• Colonic Polyps
• Colonic Pseudo-Obstruction
• Color Vision Defects
• Colorectal Neoplasms
• Colorectal Neoplasms, Hereditary Nonpolyposis
• Coma
• Combat Disorders
• Common Bile Duct Diseases
• Common Bile Duct Neoplasms
• Common Cold
• Common Variable Immunodeficiency
• Communicable Diseases
• Communicable Diseases, Emerging
• Communication Disorders
• Community-Acquired Infections
• Compartment Syndromes
• Complex Regional Pain Syndromes
• Composite Lymphoma
• Compulsive Behavior
• Compulsive Personality Disorder
• Conduct Disorder
• Condylomata Acuminata
• Cone Dystrophy
• Cone-Rod Dystrophies
• Confusion
• Congenital Abnormalities
• Congenital Bone Marrow Failure Syndromes
• Congenital Disorders of Glycosylation
• Congenital Hyperinsulinism
• Congenital Hypothyroidism
• Congenital Microtia
• Congenitally Corrected Transposition of the Great Arteries
• Conjunctival Diseases
• Conjunctival Neoplasms
• Conjunctivitis
• Conjunctivitis, Allergic
• Conjunctivitis, Bacterial
• Conjunctivitis, Inclusion
• Conjunctivitis, Viral
• Connective Tissue Diseases
• Consciousness Disorders
• Constipation
• Constriction, Pathologic
• Contracture
• Contusions
• Convalescence
• Conversion Disorder
• Coproporphyria, Hereditary
• Corneal Diseases
• Corneal Dystrophies, Hereditary
• Corneal Edema
• Corneal Endothelial Cell Loss
• Corneal Injuries
• Corneal Neovascularization
• Corneal Opacity
• Corneal Ulcer
• Corneal Wavefront Aberration
• Coronary Aneurysm
• Coronary Artery Disease
• Coronary Disease
• Coronary Occlusion
• Coronary Restenosis
• Coronary Stenosis
• Coronary Thrombosis
• Coronary Vasospasm
• Coronary Vessel Anomalies
• Coronaviridae Infections
• Coronavirus Infections
• Corticobasal Degeneration
• Cough
• COVID-19
• Coxsackievirus Infections
• Cranial Nerve Diseases
• Cranial Nerve Injuries
• Craniocerebral Trauma
• Craniofacial Abnormalities
• Craniopharyngioma
• Craniosynostoses
• CREST Syndrome
• Creutzfeldt-Jakob Syndrome
• Crigler-Najjar Syndrome
• Critical Illness
• Crohn Disease
• Cross Infection
• Croup
• Crush Injuries
• Cryoglobulinemia
• Cryopyrin-Associated Periodic Syndromes
• Cryptococcosis
• Cryptogenic Organizing Pneumonia
• Cryptorchidism
• Cryptosporidiosis
• Cubital Tunnel Syndrome
• Cumulative Trauma Disorders
• Cushing Syndrome
• Cutaneous Fistula
• Cutis Laxa
• Cyanosis
• Cystadenocarcinoma
• Cystadenocarcinoma, Mucinous
• Cystadenocarcinoma, Serous
• Cystadenoma
• Cystadenoma, Mucinous
• Cystic Adenomatoid Malformation of Lung, Congenital
• Cystic Fibrosis
• Cysticercosis
• Cystinosis
• Cystinuria
• Cystitis
• Cystitis, Interstitial
• Cystocele
• Cysts
• Cytokine Release Syndrome
• Cytomegalovirus Infections
• Cytomegalovirus Retinitis
• Cytopenia