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Pulmonary arteriovenous malformation

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Normal thymus

 

 

 

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What is the lateral margin of level 1a?

→ Medial margins of posterior bellies of the digastric muscles
→ Medial margins of anterior bellies of the digastric muscles
→ Lateral margins of posterior bellies of the digastric muscles
→ Lateral margins of anterior bellies of the digastric muscles
→ Posterior margins of anterior bellies of the digastric muscles

 

 
 

   

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