Papillary thyroid carcinoma with a retropharyngeal cystic goitre extending into the pharyngeal mucosal space.

Retropharyngeal goitre extending to the oropharyngeal level is rare. We present a case of papillary thyroid carcinoma (PTC) with a retropharyngeal cystic goitre extending to the uvular level. A woman in her 50s presented with swelling of the neck and dyspnoea. CT and MRI findings showed a primary tumour in the left lobe of the thyroid gland and a retropharyngeal dumbbell-shaped cystic goitre extending to the uvular level. Total thyroidectomy, central neck dissection and tracheostomy were performed. During the surgery, we opened the retropharyngeal space, and no mass was found. The pathological findings showed that the primary PTC (pT2) was surrounded by benign lesions, including the dumbbell-shaped cystic goitre. We speculated that the dumbbell-shaped cystic goitre extended from the visceral space (VS) into the pharyngeal mucosal space (PMS) and reached the uvular level because the thyroid gland is in the VS, and the VS and PMS are continuous spaces.