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Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...
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Modeling Primary Bone Tumors and Bone Metastasis with Solid Tumor Graft Implantation into Bone

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Benign Bone-Forming Tumors.

Fernanda Amary1, Adrienne M Flanagan1, Paul O'Donnell2

  • 1Histopathology Department, Royal National Orthopaedic Hospital, Brockley Hill, Stanmore, Greater London HA7 4LP, UK; Cancer Institute, University College London, 72 Huntley Street, London WC1E 6DD, UK.

Surgical Pathology Clinics
|November 7, 2021
PubMed
Summary
This summary is machine-generated.

Benign bone tumors like osteomas, osteoid osteomas, and osteoblastomas are described. These bone-forming lesions vary in size, location, and aggressiveness, with osteoid osteomas and osteoblastomas sharing specific genetic markers.

Keywords:
BenignBoneBone-formingOsteoblastomaOsteomaOsteoma osteoid

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Area of Science:

  • Orthopedic Oncology
  • Skeletal Pathology
  • Bone Tumors

Background:

  • Benign bone-forming tumors include osteomas, osteoid osteomas, and osteoblastomas.
  • Osteomas are typically incidental findings in the craniofacial skeleton, composed of compact bone.
  • Osteoid osteomas and osteoblastomas are painful lesions in younger patients, sharing FOS gene alterations.

Purpose of the Study:

  • To differentiate benign bone-forming tumors.
  • To highlight key characteristics of osteomas, osteoid osteomas, and osteoblastomas.
  • To describe the histological and genetic features of these tumors.

Main Methods:

  • Descriptive analysis of tumor characteristics.
  • Histopathological examination.
  • Genetic analysis (FOS gene rearrangement and c-FOS expression).

Main Results:

  • Osteomas: wide age range, incidental, craniofacial, compact bone.
  • Osteoid osteomas: <2 cm, painful, woven bone, FOS gene rearrangement.
  • Osteoblastomas: >2 cm, potentially aggressive, woven bone, FOS gene rearrangement.

Conclusions:

  • Benign bone tumors exhibit diverse clinical and histological features.
  • Osteoid osteomas and osteoblastomas are distinct but related entities characterized by FOS gene alterations.
  • Accurate diagnosis relies on size, location, clinical presentation, and histological findings.