A composite figure illustrating the historical and genetic context of Down syndrome (Trisomy 21). Panel A shows a portrait of John Langdon Down, who first described the clinical features. Panel B is a black-and-white clinical photograph of two individuals; the male exhibits characteristic dysmorphic facial features of Down syndrome, including upslanting palpebral fissures, epicanthic folds, and a flattened nasal bridge. Panel C depicts Dr. Jérôme Lejeune, the geneticist who identified the chromosomal basis of the condition. Panel D shows a spectral karyotype (SKY) or multicolor fluorescence in situ hybridization (m-FISH) arrangement. All autosomal pairs are numbered 1 through 22, along with X and Y sex chromosomes. A pink arrow highlights the genetic hallmark of the disorder: three copies of chromosome 21 (Trisomy 21) instead of the typical homologous pair. This educational graphic links clinical phenotype with its underlying cytogenetic pathology, suitable for medical genetics and pediatrics curricula.

Clinical photograph of a 15-year-old female patient exhibiting phenotypic facial features characteristic of Down syndrome (Trisomy 21). The image demonstrates a flattened facial profile with a notably low-set and depressed nasal bridge. Ocular findings include upslanting palpebral fissures and prominent bilateral epicanthic folds (medial epicanthal skin folds) covering the inner canthi. Additional craniofacial features include a relatively small oral cavity and mild brachycephaly. The patient has light skin with fine freckling across the midface. This image serves as a teaching tool for medical genetics and clinical pediatrics, illustrating the classic dysmorphic facial features associated with Trisomy 21 in an adolescent. The clinical context suggests an association with Morning Glory Syndrome (MGS), though the internal ocular pathologies are not visible in this external facial view.

This composite clinical photograph displays the postnatal morphological features of a fetus with trisomy 21 (Down syndrome). Panel A provides a facial profile view illustrating several classic dysmorphic features, including a flat facial profile, telecanthus/hypertelorism (widely spaced eyes), a markedly depressed nasal bridge, and macroglossia resulting in a protruding tongue. Panel B shows the right hand of the fetus being examined with surgical forceps, highlighting a single transverse palmar crease (simian crease), a common soft marker associated with various chromosomal abnormalities. The images are set against a blue background with a metric ruler for scale, typical of a clinical pathology or autopsy setting. These findings serve as physical manifestations of the underlying genetic duplication of 21q22.12-q22.3, which includes critical regions associated with the Down syndrome phenotype.

Clinical photograph of a pediatric patient exhibiting characteristic dysmorphic facial features and ophthalmologic abnormalities associated with Down syndrome (Trisomy 21). The image primarily demonstrates bilateral congenital ectropion of the upper eyelids, characterized by an outward eversion of the lid margins and exposure of the palpebral conjunctiva. Other visible craniofacial findings include bilateral epicanthal folds (skin folds covering the medial canthus), a flattened nasal bridge, and midface hypoplasia. There is also evident periorbital edema and an upward slanting of the palpebral fissures. This visual case illustrates the rare manifestation of congenital upper lid ectropion in the context of anterior lamellar shortening and general horizontal lid laxity. The photograph is essential for teaching neonatal and pediatric ophthalmology diagnostic signs and the phenotypic spectrum of Trisomy 21.

Clinical photograph of an infant diagnosed with Down syndrome (Trisomy 21), demonstrating typical facial features and supportive medical intervention. The infant presents with a flat facial profile, small nose, and an open-mouth posture, which are common dysmorphic features associated with the condition. A nasogastric (NG) tube is visible, entering through the right nostril and secured to the right cheek with a translucent adhesive dressing. The NG tube is indicated for nutritional support due to feeding difficulties often encountered in pediatric patients with genetic syndromes or hypotonia. The image illustrates the practical management of neonatal feeding challenges and the physical phenotype of Down syndrome. The patient is shown in a domestic or clinical setting wearing floral clothing and a bib, with eyes obscured for privacy in a medical publication context.

This clinical photograph shows the head and torso of a four-month-old infant, highlighting classic craniofacial dysmorphism associated with Trisomy 21 (Down Syndrome). Visible features include a prominent flat nasal bridge and a depressed nasal root, contributing to a flattened facial profile. The infant exhibits upslanting palpebral fissures (partially obscured for privacy) and a slightly protruding tongue (macroglossia or relative macroglossia). The head shape suggests a flat occiput, and the ears appear small and low-set. These phenotypic markers are key diagnostic indicators in pediatric genetics. The image serves as a clinical reference for identifying midface hypoplasia and other soft markers of chromosomal abnormalities during physical examination. The medical specialty is Pediatrics and Medical Genetics, intended for educational identification of syndromic facies.

A composite figure illustrating the historical and genetic context of Down syndrome (Trisomy 21). Panel A shows a portrait of John Langdon Down, who first described the clinical features. Panel B is a black-and-white clinical photograph of two individuals; the male exhibits characteristic dysmorphic facial features of Down syndrome, including upslanting palpebral fissures, epicanthic folds, and a flattened nasal bridge. Panel C depicts Dr. Jérôme Lejeune, the geneticist who identified the chromosomal basis of the condition. Panel D shows a spectral karyotype (SKY) or multicolor fluorescence in situ hybridization (m-FISH) arrangement. All autosomal pairs are numbered 1 through 22, along with X and Y sex chromosomes. A pink arrow highlights the genetic hallmark of the disorder: three copies of chromosome 21 (Trisomy 21) instead of the typical homologous pair. This educational graphic links clinical phenotype with its underlying cytogenetic pathology, suitable for medical genetics and pediatrics curricula.

This composite educational image illustrates the phenotypic and genotypic findings of a chimeric fetus with sex-chromosome discordant trisomy 21. Panel A shows a clinical photograph of the lower trunk and perineum of an aborted fetus, demonstrating phenotypically normal male external genitalia with visible cryptorchidism (undescended testes). Panel B provides a close-up view of the fetal foot where a black arrow highlights a wide space between the first and second toes, known as a 'sandal gap' deformity, a soft marker for Down syndrome. Panels C and D display G-banded karyotypes identifying two distinct cell lines within the same individual: Panel C shows a normal male karyotype (46,XY), and Panel D shows a female karyotype with trisomy 21 (47,XX,+21). The collection demonstrates the clinical presentation of chimerism, where anatomical development may not fully reflect the chromosomal mosaicism/chimerism present in different tissue layers. This material is relevant for medical genetics and embryology education focusing on chromosomal abnormalities and mosaicism.

A composite figure illustrating the historical and genetic context of Down syndrome (Trisomy 21). Panel A shows a portrait of John Langdon Down, who first described the clinical features. Panel B is a black-and-white clinical photograph of two individuals; the male exhibits characteristic dysmorphic facial features of Down syndrome, including upslanting palpebral fissures, epicanthic folds, and a flattened nasal bridge. Panel C depicts Dr. Jérôme Lejeune, the geneticist who identified the chromosomal basis of the condition. Panel D shows a spectral karyotype (SKY) or multicolor fluorescence in situ hybridization (m-FISH) arrangement. All autosomal pairs are numbered 1 through 22, along with X and Y sex chromosomes. A pink arrow highlights the genetic hallmark of the disorder: three copies of chromosome 21 (Trisomy 21) instead of the typical homologous pair. This educational graphic links clinical phenotype with its underlying cytogenetic pathology, suitable for medical genetics and pediatrics curricula.

Clinical photograph of a 15-year-old female patient exhibiting phenotypic facial features characteristic of Down syndrome (Trisomy 21). The image demonstrates a flattened facial profile with a notably low-set and depressed nasal bridge. Ocular findings include upslanting palpebral fissures and prominent bilateral epicanthic folds (medial epicanthal skin folds) covering the inner canthi. Additional craniofacial features include a relatively small oral cavity and mild brachycephaly. The patient has light skin with fine freckling across the midface. This image serves as a teaching tool for medical genetics and clinical pediatrics, illustrating the classic dysmorphic facial features associated with Trisomy 21 in an adolescent. The clinical context suggests an association with Morning Glory Syndrome (MGS), though the internal ocular pathologies are not visible in this external facial view.

Clinical photograph of an infant diagnosed with Down syndrome (Trisomy 21), demonstrating typical facial features and supportive medical intervention. The infant presents with a flat facial profile, small nose, and an open-mouth posture, which are common dysmorphic features associated with the condition. A nasogastric (NG) tube is visible, entering through the right nostril and secured to the right cheek with a translucent adhesive dressing. The NG tube is indicated for nutritional support due to feeding difficulties often encountered in pediatric patients with genetic syndromes or hypotonia. The image illustrates the practical management of neonatal feeding challenges and the physical phenotype of Down syndrome. The patient is shown in a domestic or clinical setting wearing floral clothing and a bib, with eyes obscured for privacy in a medical publication context.

Clinical photograph of a pediatric patient exhibiting characteristic dysmorphic facial features and ophthalmologic abnormalities associated with Down syndrome (Trisomy 21). The image primarily demonstrates bilateral congenital ectropion of the upper eyelids, characterized by an outward eversion of the lid margins and exposure of the palpebral conjunctiva. Other visible craniofacial findings include bilateral epicanthal folds (skin folds covering the medial canthus), a flattened nasal bridge, and midface hypoplasia. There is also evident periorbital edema and an upward slanting of the palpebral fissures. This visual case illustrates the rare manifestation of congenital upper lid ectropion in the context of anterior lamellar shortening and general horizontal lid laxity. The photograph is essential for teaching neonatal and pediatric ophthalmology diagnostic signs and the phenotypic spectrum of Trisomy 21.

This composite clinical photograph displays the postnatal morphological features of a fetus with trisomy 21 (Down syndrome). Panel A provides a facial profile view illustrating several classic dysmorphic features, including a flat facial profile, telecanthus/hypertelorism (widely spaced eyes), a markedly depressed nasal bridge, and macroglossia resulting in a protruding tongue. Panel B shows the right hand of the fetus being examined with surgical forceps, highlighting a single transverse palmar crease (simian crease), a common soft marker associated with various chromosomal abnormalities. The images are set against a blue background with a metric ruler for scale, typical of a clinical pathology or autopsy setting. These findings serve as physical manifestations of the underlying genetic duplication of 21q22.12-q22.3, which includes critical regions associated with the Down syndrome phenotype.

This clinical photograph shows the head and torso of a four-month-old infant, highlighting classic craniofacial dysmorphism associated with Trisomy 21 (Down Syndrome). Visible features include a prominent flat nasal bridge and a depressed nasal root, contributing to a flattened facial profile. The infant exhibits upslanting palpebral fissures (partially obscured for privacy) and a slightly protruding tongue (macroglossia or relative macroglossia). The head shape suggests a flat occiput, and the ears appear small and low-set. These phenotypic markers are key diagnostic indicators in pediatric genetics. The image serves as a clinical reference for identifying midface hypoplasia and other soft markers of chromosomal abnormalities during physical examination. The medical specialty is Pediatrics and Medical Genetics, intended for educational identification of syndromic facies.

Clinical photograph of a neonate in a Neonatal Intensive Care Unit (NICU) setting, demonstrating characteristic dysmorphic features associated with Down syndrome (Trisomy 21). Visible craniofacial findings include up-slanting palpebral fissures, a depressed nasal bridge, a flattened facial profile, and small, dysplastic ears. The infant exhibits a short neck and relatively short extremities. Medical interventions are present, including an orogastric or endotracheal tube secured with tape at the mouth, a peripheral intravenous (IV) line bandaged on the left hand, and a pulse oximetry sensor attached to the right foot. The neonate is placed on a green sterile drape, illustrating a post-delivery clinical assessment or procedural context for respiratory distress management. The image serves as an educational reference for identifying neonatal syndromic markers and the typical presentation of hypotonia and joint laxity in a clinical setting.

A multi-panel medical image illustrating the clinical presentation and surgical management of congenital heart disease in a pediatric patient with Trisomy 21 (Down Syndrome). Panel (a) is a clinical photograph of a child displaying characteristic dysmorphic facial features, including upward slanting palpebral fissures, a flat nasal bridge, and a protruding tongue. Panels (b), (c), and (d) provide intraoperative views during a median sternotomy. Panel (b) shows the exposed heart before surgical repair, identifying a ventricular septal defect (VSD) and a glutaraldehyde-treated pericardial patch (P) ready for use. Panel (c) demonstrates the intraoperative site after the VSD has been successfully closed with the patch (marked X). Panel (d) displays the ligation of a patent ductus arteriosus (PDA). The surgical images are labeled from the 'Surgeon's View' with 'Head End' and 'Foot End' orientations provided. This composite image serves to correlate the phenotypic features of Trisomy 21 with common associated cardiac anomalies (VSD and PDA) and their definitive surgical correction.