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A 5-week old baby boy presented to accident and emergency with a soft leftsided submandibular swelling and intermittent stridor (figure 1). He was born at 39+1 via induction for reduced fetal movements, but had normal antenatal scans. Observations and blood tests were normal. Investigations included ultrasound, MRI and incisional biopsy.
Ultrasound of the neck (figure 2A,B) reported a well-defined, soft tissue mass of similar texture to the submandibular gland and thymus, but it was separate from the retrosternal thymus. MRI (figure 2C) confirmed a mass but, due …
Contributors JS wrote the abstract, researched the evidence available and edited the images with input from CM (paediatric radiologist) and RW (paediatric surgeon).
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests The first author is the mother of the patient described in this case.
Provenance and peer review Not commissioned; externally peer reviewed.