An 80-year-old male was referred to us with squamous cell carcinoma of the left pre-auricular area that was confirmed through incisional biopsy (). The patient was suffering from occasional bleeding, discharge, and repeated ulceration of the lesion. We performed computed tomography of the head and neck region before surgery, which showed no evidence of invasion. We performed wide excision of the tumor with a 0.5 cm lateral margin throughout. We obtained a safe margin of depth without parotid gland injury even though the tumor bed was close to the parotid gland fascia (). However, we could not completely rule out micro-injuries to the parotid gland fascia although we reserved parotid gland fascia. After wide excision, the skin defect was covered with a 5×6 cm full thickness skin graft from the left inguinal area. The usual compression dressing with a tie-over suture was applied to maintain the skin graft.\nOn the fifth postoperative day, we discovered exudate from the base of the skin graft through the slit incision site (). The dressing materials were wet and the discharge from the operative site increased during meals. The amount of discharge was approximately 50 mL, and its amylase level was 200,000 unit/L. Accordingly, we confirmed the exudate was salivary discharge and he was diagnosed with a sialo-cutaneous fistula.\nWe decided to use botulinum toxin type A injection because of concern for graft failure due to increased sialorrhea that was not controlled by conventional compression dressings. Using a tuberculin syringe, we administered a transcutaneous injection of 25 IU of the toxin at a point 0.5 cm above the site of the fistula at the surgical incision line and administered another 25 IU injection 0.5 cm anterior from that point. The injections were performed only for the superficial parotid gland in order to avoid post injection facial nerve paralysis. The discharge draining from the sialo-cutaneous fistula was considerably reduced after the second day of injection. The patient fully recovered within a week without any complications such as graft shearing or failure ().
A 38-year-old man reported to the department of oral and maxillofacial surgery with a history of fall. He was diagnosed with left subcondylar, left angle and right parasymphysis fractures. He was thoroughly investigated and open reduction and internal fixation was done under general anesthesia.\nA mini-retromandibular approach was used for the fixation of the subcondylar and angle fracture, while parasymphysis fracture was reduced intraorally. On the seventh postoperative day, a diffuse swelling was observed in the left parotid region and on compressing the swelling; a watery, odorless discharge was seen from the sutured surgical wound [].\nA diagnosis of parotid fistula was made on the basis of history, location of swelling and clinical inspection of the discharge. The pressure dressing was applied for first four days after the aspiration along with antisialagogues and antibiotics. There was no significant decrease in the size of swelling or discharge.\nAfterwards we decided to use hot hypertonic saline injections. A 3% hypertonic saline was poured in a clean steel bowl and was heated to a temperature of 60 degree in an autoclave previously set at the required temperature. The mentioned site was prepared by scrubbing with Betadine solution. Five milliliter of this hypertonic solution was injected into the parotid through fistulous opening, followed by pressure dressing. The patient was instructed to continue same medicines. This procedure was repeated for three days. On the fourth day the patient did not show any signs of swelling or salivary leak as the fistula closed spontaneously.\nPressure dressings and use of antisialagogues cause fibrosis of the gland in 2 to 3 weeks;[] hence closure of fistula in 4 days was attributed to warm hypertonic saline injections. Follow-up was done for 5 months with no morbidity seen. The facial nerve and its branches were evaluated and were found to be normal.