Question: What is (are) Osteopetrosis autosomal dominant type 2 ?
Answer: Osteopetrosis is a bone disease that makes bones abnormally dense and prone to breakage (fracture). Researchers have described several major types of osteopetrosis, which are usually distinguished by their pattern of inheritance: autosomal dominant, autosomal recessive, or X-linked. The different types of the disorder can also be distinguished by the severity of their signs and symptoms. Mutations in at least nine genes cause the various types of osteopetrosis.
Source: GARD

Question: What are the symptoms of Osteopetrosis autosomal dominant type 2 ?
Answer: What are the signs and symptoms of Osteopetrosis autosomal dominant type 2? The Human Phenotype Ontology provides the following list of signs and symptoms for Osteopetrosis autosomal dominant type 2. 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) Abnormality of epiphysis morphology 90% Abnormality of the metacarpal bones 90% Abnormality of the metaphyses 90% Aseptic necrosis 90% Bone pain 90% Facial palsy 90% Frontal bossing 90% Joint dislocation 90% Macrocephaly 90% Osteoarthritis 90% Osteomyelitis 90% Recurrent fractures 90% Short distal phalanx of finger 90% Anemia 50% Genu valgum 50% Optic atrophy 50% Short stature 50% Visual impairment 50% Abnormality of leukocytes 7.5% Carious teeth 7.5% Hearing impairment 7.5% Hydrocephalus 7.5% Hypocalcemia 7.5% Bone marrow hypocellularity 5% Abnormality of pelvic girdle bone morphology - Abnormality of the vertebral endplates - Autosomal dominant inheritance - Elevated serum acid phosphatase - Facial paralysis - Fractures of the long bones - Generalized osteosclerosis - Hip osteoarthritis - Juvenile onset - Mandibular osteomyelitis - Osteopetrosis - 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.
Source: GARD