Pharyngocutaneous fistula is the leaking of saliva outside of the pharynx (“throat” part of the swallowing passage) through a defect in the pharyngeal mucosa lining. This may occur transiently in up to 20% of persons who have undergone total laryngectomy, with the sixth postoperative day the peak time of incidence. Prior radiation therapy seems to increase the risk of fistulization.

Traditionally, the treatment was to make a midline incision directly, insert a penrose drain, and then use pressure dressings. Modern treatment uses suction drains to control salivary leakage and allow the rest of the skin flap to adhere to the neck 1. Then, the drain is removed, shortened, and replaced a series of times to allow the tract to close from top to bottom.

Pharyngocutaneous Fistula

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Pharyngocutaneous fistula (1 of 3)

Panorama of reconstructed hypopharynx one week after laryngectomy for persistent cancer after radiotherapy. (PPW = posterior pharyngeal wall. PE = pseudo-epiglottis, often seen after reconstruction. F's arrow = fistula. E = esophageal entrance.)

Closer view (2 of 3)

Closer view of fistula opening and esophageal entrance, with salivary pooling.

Pharyngocutaneous fistula (3 of 3)

Patient receiving suction drain treatment. The suction tubing evacuates saliva drop by drop as it forms, eliminating the need for wound dressings and long term antibiotics. This treatment also prevents infection and causes less discomfort for the patient than traditional treatment.

Anterior Commissure-to-subglottis Fistula Complication of Radiation

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Larynx losing function (1 of 4)

This man underwent supraglottic laryngectomy and radiotherapy nearly 20 years ago. A biopsy was done some years later elsewhere, and triggered radionecrosis. Hyperbaric oxygen treatments back then saved the day. This larynx has continued to lose function slowly over time, necessitating tracheotomy, and with deteriorating voice quality. The latest problem is coughing on liquids, and they are coming out his tracheotomy tube. Here, you see the arytenoid apices (each marked with A). Epiglottis and false vocal cords are surgically absent. Base of tongue (BoT) was pulled down to the level of the vocal cords. Click to enlarge this photo to see the dots marking the upper surface of each cord.

Swallowing (2 of 4)

Now looking deep into the surgically-minimized laryngeal vestibule, the two larger dots are again on the vocal cords, for comparison with photo 1. The fine dotted line encircles a fistula. When the patient swallows, food or liquid can enter in the direction of the arrow. Where it goes next is seen in the following photos.

View from between vocal cords (3 of 4)

The scope has entered between the cords (between the dots in photo 2), and is now viewing the subglottis. “T” near the top of the photo marks where the tracheotomy tube is seen entering the trachea. The anterior subglottic fistula is seen at the bottom of the photo with the sidewall of the tracheotomy tube seen at the lower-case “t.”

Swallowing water (4 of 4)

Remaining in the anterior subglottis while the patient swallows pale blue-stained water, you see a part of the bolus “exploding” through the fistula, and this series of 4 photos taken together fully explain why this man is having so much difficulty with liquids that he swallows coming out his tracheotomy tube.
References
  1. Bastian RW, Park AH. Suction drain management of salivary fistulas. Laryngoscope. 1995;105(12 Pt 1):1337-41.[]