ANAMNESIS / SYMPTOMS:
A 48 year old patient suffers from a stenosis of the left parotid duct after operation and has undergone stent insertion into the duct because of iatrogenic caused stenosis.


FINDINGS:
Lying masseter muscle and the mandible with its distal signal extinction the region of the left parotid duct is visible. In the duct a hyperechoic structure with double contour is visualized that reaches from Bichat´s fat pad to the oral cavity. Underneath there are hyperechoic reflections with distal signal extinction recognizable.


DIAGNOSE:
A patient who underwent stent insertion into the Stenon´s duct because of iatrogenic caused stenosis shows sonographically a regularly located stent with its double contour and some air inclusions around it immediately after insertion. The echo-reflecting signal described above is caused by the air inclusions.