📌 Fibrous Dysplasia on MRI_ What’s the pattern? 👀

https://youtube.com/shorts/ZzTAvxRd-fI

 

① Location
• Centric medullary lesion
• Long bone diaphysis
• Smooth cortex (even when thinned)

 

② Signal (non-specific on purpose)
• T1WI: iso- to low signal
• T2WI: variable
• Often heterogeneous

 

③ Secondary changes (very common)
• Cystic degeneration
• Hemorrhage
• Fluid–fluid levels (ABC-like)

 

④ Contrast enhancement (this matters)
• Mild, diffuse, heterogeneous
• No nodular or mass-like enhancement
• Cystic areas = non-enhancing

 

⑤ Key clue: Milk cloud appearance ☁️
• Patchy, ill-defined, cloudy enhancement
• Spreads within a low-signal matrix
• Reflects loose fibro-osseous stroma
• Not a solid hypervascular tumor

 

If enhancement looks “cloudy,” not “solid” → think FD.

 

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