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Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
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Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
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The bones of the human skeletal system are of varied shapes, sizes, and functions. They can be classified based on their shape and function into four major classes: long bones, short bones, flat bones, and irregular bones. Some classifications include a fifth type, the sesamoid bones, as a separate class, whereas others categorize them under short bones.
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Bone cysts: unicameral and aneurysmal bone cyst.

E Mascard1, A Gomez-Brouchet2, K Lambot3

  • 1Clinique Arago, 93, boulevard Arago, 75014 Paris, France; Service de chirurgie orthopédique, hôpital Necker, 149, rue de Sèvres, 75015 Paris, France; Département de pédiatrie, institut Gustave-Roussy, 94805 Villejuif cedex, France.

Orthopaedics & Traumatology, Surgery & Research : OTSR
|January 13, 2015
PubMed
Summary

Simple bone cysts (UBC) and aneurysmal bone cysts (ABC) are common in children. Differentiating these benign bone lesions is crucial for appropriate treatment and managing risks like fractures or bone destruction.

Keywords:
Aneurysmal bone cystBiopsyBone tumorCurettageSimple bone cystUnicameral bone cyst

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Area of Science:

  • Orthopedics
  • Pediatric Oncology
  • Radiology

Background:

  • Simple bone cysts (UBC) and aneurysmal bone cysts (ABC) are benign lytic bone lesions frequently seen in pediatric patients.
  • UBCs are typically unicameral, while ABCs are expansive, hemorrhagic, and often multicameral, sometimes associated with translocations.
  • Distinguishing between UBC and ABC is critical due to differing prognoses and management strategies.

Purpose of the Study:

  • To outline the key characteristics of simple and aneurysmal bone cysts.
  • To emphasize the importance of differentiating between UBC and ABC for appropriate clinical management.
  • To discuss the diagnostic and therapeutic approaches for both entities.

Main Methods:

  • Review of clinical presentations, imaging findings (especially MRI), and histopathological features of UBC and ABC.
  • Analysis of treatment outcomes for various interventions, including observation, intracystic injections, sclerotherapy, and surgical options.
  • Comparison of the natural history and potential complications of UBC versus ABC.

Main Results:

  • UBCs typically resolve spontaneously and pose a risk of pathologic fracture; treatment may involve observation, methylprednisolone injection, or surgery for high-risk cases.
  • ABCs can be more aggressive, with risks of bone destruction; diagnosis requires biopsy to rule out mimics like telangiectatic sarcoma.
  • Effective treatments for ABCs include alcohol sclerotherapy or surgery, particularly for spinal or aggressive lesions.

Conclusions:

  • Accurate differentiation between UBC and ABC based on clinical, radiological, and pathological findings is essential.
  • Treatment strategies for UBC and ABC should be tailored to the specific cyst type, location, and associated risks.
  • While generally benign, vigilance for complications and accurate diagnosis are paramount in managing these pediatric bone lesions.