What are the signs and symptoms of Roberts syndrome? The Human Phenotype Ontology provides the following list of signs and symptoms for Roberts syndrome. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can use the MedlinePlus Medical Dictionary to look up the definitions for these medical terms. Signs and Symptoms Approximate number of patients (when available) Abnormal hair quantity 90% Aplasia/Hypoplasia of the radius 90% Aplasia/Hypoplasia of the thumb 90% Bowing of the long bones 90% Clinodactyly of the 5th finger 90% Hypertelorism 90% Hypoplasia of the zygomatic bone 90% Intrauterine growth retardation 90% Microcephaly 90% Short stature 90% Underdeveloped nasal alae 90% Upper limb phocomelia 90% Abnormality of female external genitalia 50% Aplasia/Hypoplasia of the earlobes 50% Brachydactyly syndrome 50% Cataract 50% Cognitive impairment 50% Cryptorchidism 50% Long penis 50% Oral cleft 50% Premature birth 50% Proptosis 50% Radioulnar synostosis 50% Underdeveloped supraorbital ridges 50% Abnormality of the palate 7.5% Aplasia/Hypoplasia affecting the eye 7.5% Blue sclerae 7.5% Craniosynostosis 7.5% Finger syndactyly 7.5% Glaucoma 7.5% Multicystic kidney dysplasia 7.5% Nystagmus 7.5% Patellar aplasia 7.5% Polyhydramnios 7.5% Sandal gap 7.5% Short neck 7.5% Single transverse palmar crease 7.5% Stillbirth 7.5% Synostosis of carpal bones 7.5% Thrombocytopenia 7.5% Abnormality of the metacarpal bones - Absent earlobe - Accessory spleen - Ankle contracture - Atria septal defect - Autosomal recessive inheritance - Bicornuate uterus - Biliary tract abnormality - Brachycephaly - Cafe-au-lait spot - Cleft eyelid - Cleft palate - Cleft upper lip - Clinodactyly - Clitoromegaly - Cranial nerve paralysis - Cystic hygroma - Elbow flexion contracture - Enlarged labia minora - Frontal encephalocele - High palate - Horseshoe kidney - Hydrocephalus - Hypospadias - Intellectual disability - Knee flexion contracture - Low-set ears - Malar flattening - Microphthalmia - Midface capillary hemangioma - Narrow naris - Oligodactyly (hands) - Opacification of the corneal stroma - Patent ductus arteriosus - Phocomelia - Polycystic kidney dysplasia - Posteriorly rotated ears - Postnatal growth retardation - Premature separation of centromeric heterochromatin - Radial deviation of finger - Severe intrauterine growth retardation - Shallow orbits - Sparse hair - Syndactyly - Talipes equinovalgus - Ventricular septal defect - Wide nasal bridge - Wrist flexion contracture - The Human Phenotype Ontology (HPO) has collected information on how often a sign or symptom occurs in a condition. Much of this information comes from Orphanet, a European rare disease database. The frequency of a sign or symptom is usually listed as a rough estimate of the percentage of patients who have that feature. The frequency may also be listed as a fraction. The first number of the fraction is how many people had the symptom, and the second number is the total number of people who were examined in one study. For example, a frequency of 25/25 means that in a study of 25 people all patients were found to have that symptom. Because these frequencies are based on a specific study, the fractions may be different if another group of patients are examined. Sometimes, no information on frequency is available. In these cases, the sign or symptom may be rare or common.