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MRI and MR are exceptions to the rule that all abbreviations should have their expanded form in parentheses in descriptions.

Magnetic resonance imaging

Descriptions:

FSN: Magnetic resonance imaging of X (procedure)
PT: MRI of X
SYN: Magnetic resonance imaging of X

For example,

- - FSN: Magnetic resonance imaging of chest (procedure)
  - PT: MRI of chest
  - SYN: Magnetic resonance imaging of chest

Magnetic resonance angiography

Descriptions:

FSN: Magnetic resonance angiography of X (procedure)
PT: Magnetic resonance angiography of X
SYN: Magnetic resonance angiogram of X
SYN: MR angiography of X

For example,

- - FSN: Magnetic resonance angiography of carotid artery (procedure)
  - PT: Magnetic resonance angiography of carotid artery
  - SYN: Magnetic resonance angiogram of carotid artery
  - SYN: MR angiography of carotid artery

Magnetic resonance venography

Descriptions:

FSN: Magnetic resonance venography of X (procedure)
PT: Magnetic resonance venography of X
SYN: Magnetic resonance venogram of X
SYN: MR venography of X

For example,

- - FSN: Magnetic resonance venography of limb (procedure)
  - PT: Magnetic resonance venography of extremity
  - SYN: Magnetic resonance venography of limb

Magnetic resonance arthrography

Descriptions:

FSN: Magnetic resonance arthrography of X (procedure)
PT: Magnetic resonance arthrography of X
SYN: Magnetic resonance arthrogram of X
SYN: MR arthrography of X

For example,

- - FSN: Magnetic resonance arthrography of right knee (procedure)
  - PT: Magnetic resonance arthrography of right knee
  - SYN: MR arthrography of right knee

Magnetic resonance spectroscopy

Descriptions:

FSN: Magnetic resonance spectroscopy of X (procedure)
PT: Magnetic resonance spectroscopy of X
SYN: MR spectroscopy of X

For example,

- FSN: Magnetic resonance spectroscopy of liver (procedure)
- PT: Magnetic resonance spectroscopy of liver
- SYN: MR spectroscopy of liver