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Related Concept Videos

Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during bone...
Spongy Bone01:09

Spongy Bone

All bones comprise an outer layer of compact bone, and an interior made up of spongy bone tissue, also called cancellous or trabecular bone. In long bones, spongy bone tissue is mainly found in the interior of the epiphyses (broad ends of the bone).
Spongy bone is more porous, and less dense compared to compact bone. It is composed of concentric lamellae that are arranged irregularly to form the trabecular network. In some bones, the spaces between trabeculae contain red marrow, where...
Bone Disorders01:29

Bone Disorders

Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
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Related Experiment Video

Updated: Jun 22, 2026

Three-Dimensional Bone Extracellular Matrix Model for Osteosarcoma
08:07

Three-Dimensional Bone Extracellular Matrix Model for Osteosarcoma

Published on: April 12, 2019

Parosteal osteosarcoma.

M Samardziski1, G Zafiroski, C Tolevska

  • 1University Clinic for Orthopedic Surgery, University "St. Cyril and Methodius", Skopje, Macedonia. milan_samardziski@yahoo.com

Bratislavske Lekarske Listy
|June 11, 2009
PubMed
Summary

This study analyzed 6 osteosarcoma cases, revealing two distinct parosteal osteosarcoma types. One type, initially benign, has malignant potential, while the other is highly malignant, requiring different surgical approaches.

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Area of Science:

  • Orthopedic Surgery
  • Oncology
  • Pathology

Background:

  • Osteosarcoma is a primary bone tumor.
  • Parosteal and periosteal osteosarcomas are subtypes.
  • This study focuses on 6 cases from a single clinic.

Purpose of the Study:

  • To analyze clinical and histopathological findings of osteosarcoma cases.
  • To differentiate between biologically distinct types of parosteal osteosarcoma.
  • To recommend appropriate treatment strategies based on tumor type.

Main Methods:

  • Retrospective clinical study.
  • Analysis of 6 osteosarcoma cases (5 parosteal, 1 periosteal).
  • Review of patient history, diagnosis, treatment, and outcomes.

Main Results:

  • Osteosarcoma represented 1.5% of primary bone tumors treated.
  • Misinterpreted diagnoses occurred in 50% of cases.
  • High rates of local recurrence (83.3%), metastases (33.3%), and mortality (33.3%) were observed.
  • Two distinct parosteal osteosarcoma types identified: one with delayed malignant potential, another highly malignant from onset.

Conclusions:

  • Parosteal osteosarcoma exhibits diverse biological behavior.
  • Radical surgery and chemotherapy are recommended for highly malignant types.
  • Compartmental, en bloc resection and regular follow-up are advised for tumors with delayed malignant potential.