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T1-weighted MRI scan of Guyon's canal. The arrow indicates the fatty mass reported as lying atop Guyon's canal.
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T1-weighted and STIR (short T1 inversion recovery) MRI scan of the wrist, reconstructed in axial and coronal planes was performed (Fig. 1). This showed no obvious deformity in Guyon's canal and no abnormality along the ulnar nerve.
Operative pictures of Guyon's canal: lipoma in forceps, yellow sloop around nerve, red sloop around the ulnar artery.
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A multi-lobulated piece of fatty tissue was found within the canal measuring 3 cm x 2 cm x 1.5 cm (Fig. 2).