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Primary Bone Tumors - Differential Diagnosis Algorithm 

Metastatic - Most common tumour in adults
 - Breast
Primary Bone Tumors ... Cyst Malignant ... #Bony #Tumors # ... Tumours #MSK #Differential ... #Orthopedics #Causes
Diagram of different types of bone tumors that can occur around the knee on XRay -
degenerative subchondral cyst ... island • Stress fracture ... Chondrosarcoma • Stress fracture ... #Bony #Differential ... #Radiology #XRay
Diagram of different types of bone tumors that can occur around the knee on XRay
Age <
bone cyst • Osteoid ... island • Stress fracture ... Chondrosarcoma • Stress fracture ... #Bony #Differential ... #Diagnosis #Radiology
Pathologic / Fragility Fractures - Differential Diagnosis Algorithm 
Tumours
 - See Bone Lesions Scheme
Paget's Disease
 -
- Differential ... Diagnosis Algorithm Tumours ... - See Bone Lesions ... - Skull/spine/Pelvis ... #Orthopedics #Causes
Stridor - Differential Diagnosis Framework:
High-pitched, variable respiratory sound

ETIOLOGIES:
Infectious:
 • Retropharyngeal abscess
 • Acute epiglottitis
 • Peritonsillar
Stridor - Differential ... Mechanical: • Larynx fracture ... • Bronchogenic cyst ... Tracheal mass/tumor ... #diagnosis #causes
Causes of Knee Effusions - Differential Diagnosis Framework

Knee Effusion Red Flags:
1. Fever/Chills/Joint pain/Night sweats/Weight loss
	- DDX:
		-
Causes of Knee Effusions ... - Differential ... Intra-articulation fracture ... - Aneurysmal bone ... cyst - Osteochondroma
The table on the left is the overall table for mediastinal masses.
In the next paragraphs we
- Benign Cysts ... - Foregut cysts ... Diagnosis #Pulmonary #Radiology ... Mediastinal #Mass #Differential ... Middle #Posterior #RadiologyAssistant
Nonossifying Fibroma with Pathologic Fracture - MSK Radiology
Imaging Findings:
 • Cortically based, geographic, lucent lesion with
- MSK Radiology ... Differential diagnosis ... lesion: • Simple bone ... cyst: Central, ... • Aneurysmal bone
Liposclerosing Myxofibrous Tumor (LSMFT) - MSK Radiology
Imaging Findings:
 • Geographic lucent lesion with sclerotic margin in
Liposclerosing Myxofibrous Tumor ... Case description ... Differential diagnosis ... cyst: expansile ... #Myxofibrous #Tumor