Salt and pepper sign

The salt and pepper sign is used to refer to a speckled appearance of tissue. It is used in many instances, but most commonly on MRI. Please note that pathologists also use the term.

Differential diagnosis

Vascular tumours

Used to describe some highly vascular tumours which contain foci of haemorrhage, typically a paraganglioma. The appearance is on on T1 weighted sequences, and is made up of:

  • punctate regions of hyperintensity = salt
  • small flow voids = pepper

Typical tumours with this appearance include:

Similar appearance may be seen on T2 sequences or post contrast T1 sequences in patients with juvenile nasopharyngeal angiofibromas 6.

This appearance can also be seen in other hypervascular tumours such as metastatic hypernephroma or metastatic thyroid carcinoma 7.

Sjögren syndrome

The parotid gland in Sjögren syndrome has also been described as having a salt and pepper appearance, due to a combination of punctate regions of calcification (pepper) and fatty replacement (salt)

Vertebral haemangioma

A less common usage for the term is for vertebral haemangiomas which have a courser black and white dotted appearance especially on axial T2 and T1 images (salt = fat, pepper = coarsened trabeculae).

MRI noise artefact

A related use of the term is to describe the noise sometimes seen in MRI images. 

When you think about it, you can probably find folk who have used the term for all sorts of lesions; any lesion that has a fine granular imaging texture will do the trick.

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Article Information

rID: 4630
Section: Signs
Synonyms or Alternate Spellings:

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