dear sir/ ma'm, thanks for visiting HCM. as is clear from your query you have a large goitre
. this thyroid
gland enlargement at times can be in the posterior part of the neck as well, whereas what we see is only the anterior part. this posterior enlargement can be compressing the oesophagus and the trachea. though you have not mentioned about respiratory symptoms. you need MRI
neck to see the posterior extension and must see your doctor with the report. regards!