Infantile cortical hyperostosis

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Infantile cortical hyperostosis
ICD-10 M89.8
ICD-9 756.59
OMIM 114000
DiseasesDB 29307
eMedicine orthoped/151 
MeSH D006958

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Infantile cortical hyperostosis is a self-limited inflammatory disorder of infants that causes bone changes, soft tissue swelling and irritability. The disease may be present at birth or occur shortly thereafter. The cause is unknown. Both familial and sporadic forms occur. It is also known as Caffey disease or Caffey's disease.

Features

An affected infant typically has the following triad of signs and symptoms: soft-tissue swelling, bone lesions, and irritability. The swelling occurs suddenly, is deep, firm, and may be tender. Lesions are often asymmetric and may affect several parts of the body. Affected bones have included the mandible, tibia, ulna, clavicle, scapula, ribs, humerus, femur, fibula, skull, ilium, and metatarsals. When the mandible (lower jaw bone) is affected, infants may refuse to eat, leading to failure to thrive.

Diagnosis

Most infants with infantile cortical hyperostosis are diagnosed by physical examination. X-rays can confirm the presence of bone changes and soft tissue swelling. Biopsy of the affected areas can confirm the presence of typical histopathological changes. No specific blood tests exist, but tests such as erythrocyte sedimentation rate (ESR) and alkaline phosphatase levels are often elevated. A complete blood count may show anemia (low red blood cell count) and leukocytosis (high white blood cell count). Other tests may be done to help exclude other diagnoses. Ultrasound imaging can help diagnose prenatal cases.

Differential diagnosis

Osteomyelitis (bone infection), which is much more common than infantile cortical hyperostosis, must be excluded, since it requires urgent treatment. Other diagnoses that can mimic this disorder and need to be excluded include physical trauma, child abuse, Vitamin A excess, hyperphosphatemia, prostaglandin E1 and E2 administration, scurvy, infections (including syphilis), Ewing sarcoma, and metastatic neuroblastoma.

Pathophysiology

In the early stages of infantile cortical hyperostosis, biopsy shows inflammation of the periosteum and adjacent soft tissues. After this resolves, the periosteum remains thickened, and subperiosteal immature lamellar bone can be seen on biopsy, while the bone marrow spaces contain vascular fibrous tissue. Eventually the inflammation and subperiosteal changes resolve, and hyperplasia of lamellar cortical bone can be seen.

Radiographs initially show layers of periosteal new bone formation with cortical thickening. Periosteal new bone may cover the diaphysis of the bone, causing an increase in diameter of the bone. Over time, the periosteal new bone density increases, becoming homogenous with the underlying cortex. Eventually the bone remodels and resumes a normal appearance.

Prognosis

Infantile cortical hyperostosis is a self-limited condition, meaning that the disease resolves on its own without treatment, usually within 6-9 months. Long-term deformities of the involved bones, including bony fusions and limb-length inequalities, are possible but rare.

Epidemiology

The disease has been reported to affect 3 per 1000 infants younger than 6 months in the United States. No predilection by race or sex has been established. Almost all cases occur by the age of 5 months. The familial form is inherited in an autosomal dominant fashion with variable penetrance. The familial form tends to have an earlier onset and is present at birth in 24% of cases, with an average age at onset of 6.8 weeks. The average age at onset for the sporadic form is 9-11 weeks.

History

John Caffey (1895-1978) first described infantile cortical hyperostosis in 1945. He described a group of infants with tender swelling in the soft tissues and cortical thickenings in the skeleton, with onset of these findings during the first 3 months of life. [1]

References

  1. Caffey J: Infantile Cortical Hyperostoses. J Pediatr 1946; 29: 541-59.
  • Herring J, ed: Infantile Cortical Hyperostosis. In: Tachdjian's Pediatric Orthopaedics. Philadelphia, Pa: WB Saunders; 1561-1565.

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