We present the case of a 26-year-old female patient with coincidental ultrasound finding of a neck tumour located below the left thyroid lobe. The tumour slightly increased in size over a year.
Fine needle aspiration indicated the neuroectodermal origin of the tumour and surgical removal was performed. Although the tumour mass was carefully and successfully removed, post-operational Horner's syndrome appeared.
The tumour tissue was diagnosed as ganglioneuroma by histopathology.