Published in:
01-04-2019 | Classics in Abdominal Radiology
Moustache sign
Published in: Abdominal Radiology | Issue 4/2019
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‘Moustache sign’ seen in multiparametric MR imaging of the prostate signifies the presence of bilateral symmetric oval-shaped areas of low signal intensity on T2-WI at the base of the prostate lateral to the opening of ejaculatory ducts (Figs. 1, 2). The clinical significance of this sign is that it can mimic cancer. These symmetric areas can show diffusion-restriction, early enhancement on dynamic contrast imaging, and wrongly categorized PIRADS 4/5 according to PIRADS v.2. The use of coronal T2-weighted sequence, sharp margins, and symmetric pattern can correctly score this pattern into 2/5, excluding the presence of cancer [1, 2].
Fig. 1
The Qantas Wallabies unveiling a Boeing 737–800 aircraft sporting a giant moustache which will fly around the country during the month of November raising awareness of prostate cancer and men’s mental health. Downloaded from https://commons.wikimedia.org/wiki/Category:Moustaches_in_art#/media/File:Movember_(8140167077).jpg
Fig. 2
Two oval-shaped, symmetric, bilateral areas of low signal intensity on axial (a) and coronal (b) T2-weighted imaging, denoted by arrows, with restricted diffusion in the ADC map (c) and diffuse early enhancement on DCE imaging (d). This set of appearances has been called the “moustache sign”
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