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Related Concept Videos

Bone Formation by Intramembranous Ossification01:29

Bone Formation by Intramembranous Ossification

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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.
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into ...
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Bone Formation by Endochondral Ossification01:24

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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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Bone Disorders01:29

Bone Disorders

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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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Spongy Bone01:09

Spongy Bone

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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).
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Pleural Effusion I: Introduction01:25

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Pleural effusion is an abnormal fluid accumulation in the pleural cavity, a narrow space between the lungs and the chest wall. It is not a disease per se but rather a symptom or indication of an underlying disease. In normal circumstances, this space contains a small amount of fluid (5 to 15 mL), a lubricant facilitating the non-frictional movement of the pleural surfaces.
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Radiological Investigation III: Pulmonary Angiogram and PET Scan01:13

Radiological Investigation III: Pulmonary Angiogram and PET Scan

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Radiological investigations are paramount in the diagnosis and management of various pulmonary diseases. Two essential investigations are the Pulmonary Angiogram and the Positron Emission Tomography (PET) Scan.
Pulmonary Angiogram
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Related Experiment Video

Updated: Aug 12, 2025

Laminectomy for the Removal of Thoracic Ossification of the Ligamentum Flavum TOLF Using Ultrasonic and Conventional Osteotomes
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Diffuse pulmonary ossification: A case report unveiling clinical and histopathological challenges.

Francesca Polit1, Ferial Alloush1, Cynthia Espinosa2

  • 1Arkadi M. Rywlin M.D. Department of Pathology and Laboratory Medicine, Mount Sinai Medical Center, Miami Beach, FL, 33140, USA.

Respiratory Medicine Case Reports
|January 30, 2023
PubMed
Summary

Diffuse pulmonary ossification (DPO) is a rare lung condition. This case highlights DPO as a potential diagnosis for patients presenting with diffuse pulmonary nodules, even without underlying chronic lung disease.

Keywords:
Case reportDiffuse pulmonary ossificationNodular pulmonary ossificationPulmonary alveolar microlithiasis

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Area of Science:

  • Pulmonology
  • Pathology
  • Radiology

Background:

  • Diffuse pulmonary ossification (DPO) is a rare condition involving bone formation in the lungs.
  • It is often associated with chronic pulmonary diseases, but idiopathic cases exist.
  • Distinguishing DPO from other conditions like pulmonary alveolar microlithiasis (PAM) and miliary tuberculosis (TB) can be challenging.

Observation:

  • A 36-year-old man presented with progressive dyspnea, cough, and hemoptysis.
  • Imaging revealed numerous pulmonary nodules throughout both lungs.
  • Initial differential diagnoses included PAM and miliary TB, but tests for these were negative.

Findings:

  • Surgical resection and microscopic examination confirmed diffuse pulmonary ossification.
  • The findings showed mature bone and fatty marrow without significant underlying lung pathology.
  • This case represents an idiopathic DPO presentation.

Implications:

  • Clinicians and radiologists should consider DPO in the differential diagnosis of diffuse pulmonary nodules.
  • The possibility of DPO should not be dismissed in the absence of known chronic pulmonary conditions.
  • Awareness of DPO aids in accurate diagnosis and management of rare lung diseases.