Phrygian cap

Phrygian caps are the most common congenital anatomic variant of the gallbladder. It denotes folding of the fundus back upon the gallbladder body and is asymptomatic with no pathological significance.

A Phrygian cap may be identified in ultrasound, multiphase CT/MRI or in cholescintigraphy 3

Ultrasound 

May be wrongly interpreted as an apparent septum in an otherwise normal gallbladder.

Multiphase CT/MRI

Usually clearly identify Phrygian caps from mass lesions. 

Cholescintigraphy

When multiphase CT/MRI are inconclusive, cholescintigraphy will be clinical in preventing an unnecessary cholecystectomy. Gallbladder appears often smaller than the gallbladder fossa. Delayed imaging demonstrates filling of the gallbladder ruling out an underlying mass lesion. 

The appearance is reminiscent of a Phrygian cap a head garment worn by inhabitants of Phrygia (modern Turkey) 1200-700 BC 1-2. Of note, the smurfs also wear a similar hat. 

Abdominal and pelvic anatomy
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Article information

rID: 1870
Sections: Signs, Anatomy
Synonyms or Alternate Spellings:

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Cases and figures

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    Phrygian cap

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    Figure 2: Phrygian cap
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    Phrygian cap
    Case 1: MRCP
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    Case 2: with gallstones
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    Case 3
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