Endoscopic ultrasound

Endoscopic ultrasound (EUS) is a procedure combining the range of endoscopy with the diagnostic abilities of ultrasound. EUS is used in the imaging of the upper GI tract and surrounding structures as well as the respiratory tract (where it is referred to as endobronchial ultrasound, EBUS).  A high frequency transducer crystal is used, typically in the range of 12-20 Megahertz.

Radiographic features

Normal

In a healthy patient, five layers are seen1:

  • innermost layer (hyperechoic): superficial mucosal layer corresponding to the interface of the esophageal lumen and the mucosal layer
  • second layer (hypoechoic): mucosal layer
  • third layer (hyperechoic): submucosal layer
  • fourth layer (hypoechoic): muscularis propria
  • fifth layer (hyperechoic): esophageal adventitia
Esophageal cancer

Endoscopic ultrasound can be used for local TNM staging of esophageal cancer to determine the local invasion of the tumor through the normal esophagus.

Pancreatic lesions 

Endoscopic ultrasound can be used for aspiration of both solid and cystic pancreatic masses.  

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Article information

rID: 27422
Synonyms or Alternate Spellings:
  • Endoscopic ultrasonography
  • Endosonography
  • EUS
  • EBUS
  • Endobronchial ultrasound
  • Endobronchial ultrasonography

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Cases and figures

  • Case 2: pancreatic adenocarcinoma
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