Definition

Noun: A rare genetic (inherited) disorder characterized by abnormally dense, hard, and brittle bones due to defective bone resorption by osteoclasts. This increased bone density can lead to complications such as bone marrow cavity reduction, anemia, and increased susceptibility to fractures.

Usage and Examples

• Noun:
  • The diagnosis of osteopetrosis explained the child's frequent fractures and vision problems.
  • Treatment for severe osteopetrosis may include a bone marrow transplant.

Advanced Usage and Context

• Medical Context: The term is used almost exclusively in medical, genetic, and pathological contexts. It is often categorized by age of onset (e.g., infantile/malignant osteopetrosis, adult/benign osteopetrosis).
• "Marble bone disease": This is a descriptive, non-technical synonym for osteopetrosis, referring to the dense, stone-like appearance of the bones on X-rays.

Variants and Related Words

• Albers-Schönberg disease: Another name for the adult, autosomal dominant form of osteopetrosis.
• Osteopetrotic (adj): Relating to or affected by osteopetrosis.
  • The patient showed osteopetrotic changes on the radiograph.

Synonyms

• Marble bone disease
• Albers-Schönberg disease (specific form)

Notes on Meaning

While the core definition is constant, the severity and associated symptoms define the major types: 1. Infantile/Malignant Osteopetrosis: Severe, autosomal recessive form presenting in infancy with life-threatening complications like bone marrow failure. 2. Adult/Benign Osteopetrosis: Milder, autosomal dominant form where many individuals may be asymptomatic or have minor symptoms.

Noun

1. an inherited disorder characterized by an increase in bone density; in severe forms the bone marrow cavity may be obliterated