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First Aid
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First Aid for the USMLE Step 1 (2023)
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First Aid for the USMLE Step 1 (2023) | Medicine (MD/DO) School Study Aid

Page 470 -
5 Picmonics to Learn | 12 mins
Osteochondroma
Characteristics
Most Common Benign Bone Tumor
Males Under 25
Cartilage-capped Spurs
Metaphysis of Long Bones
Small Risk of Chondrosarcoma
Clinical Features
Painless Mass near Joint
Painful if Growing or Malignant
Workup
X-Ray
MRI if Concern for Malignancy or Functional Limitation
Management
Monitoring
Surgery
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3 mins
Osteoma
Benign
Cortex
Compact and Wavy (Trabecular) Bone
Skull and Paranasal Sinuses
Symptoms are Variable
ASSOCIATIONS
Gardner Syndrome
Tuberous Sclerosis
CHARACTERISTICS
Lesions with Density Identical to the Cortex
TREATMENT AND PROGNOSIS
Observation
No Malignant Transformation
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3 mins
Osteoid Osteoma and Osteoblastoma
Characteristics
Benign Bone Tumors
Osteoid Osteoma
Osteoid Osteoma
Cortex of Long Bones
Pain Relieved by NSAIDs
Pain Worse at Night
<2 cm
Radiolucent Nidus with Surrounding Sclerosis
Osteoblastoma
Osteoblastoma
Spine
Pain Not Relieved by NSAIDs
> 2 cm
Radiolucent Nidus without Surrounding Sclerosis
Management
Surgery
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3 mins
Enchondromas
Benign Cartilaginous Tumors
ORIGINS
Growth Plate Cartilage Remnants
Chondrocytes that Proliferate and Enlarge
LOCATION
Medullary Cavity
Metaphysis
Long Bones of the Hands and Feet
Humerus and Femur
Clinical Findings
Small, Central Lesions
Well-Circumscribed Nodules of Hyaline Cartilage
Calcifications
Treatment
Surgery
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2 mins
Giant Cell Tumor
Pathophysiology
Osteoclastoma
Epiphyseal End of Long Bones
Peak Incidence 20-40 Years
Benign
Knee Region
Diagnosis
Soap Bubble Appearance on X-ray
Spindle-shaped Cells
Multinucleated Giant Cells
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46 secs

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