Key points
- Nineteen complete fistulectomies of PSF and 12 of 19 histological
analyses.
- There were two routes passing inside or outside the inferior horn of
thyroid cartilage.
- The cases from 3rd pouch origin seemed to route
inside the horn.
- The tracts originated from 4th pouch appeared to run
outside the horn.
- PSF from 4th pouch origin tended to cause severe
deep neck infection.
Key words: pyriform sinus fistula; pharyngeal pouch;
fistulectomy; acute suppurative thyroiditis; thyroid