Medialisation laryngoplasty with bone wax in a sheep model.

OBJECTIVE: To evaluate the safety and biocompatibility of bone wax as an implant material for medialisation laryngoplasty in a large animal model. METHODS: Three Dorper-cross ewes underwent type I thyroplasty of the right vocal fold with bone wax. The animals were monitored for four weeks for general wellbeing. The animals were euthanised and the larynges harvested. Histological evaluation was performed to assess for adverse tissue reaction and biocompatibility. RESULTS: The mean (± standard deviation) amount of bone wax implanted was 0.49 g (± 0.12 g). No adverse events were reported. Ex vivo vibration was present on high-speed imaging for all medialised vocal folds. Histology demonstrated implanted paraffin embedded within the thyroarytenoid muscle with no evidence of resorption, a minimal inflammatory infiltrate, and a thin fibrotic capsule. CONCLUSION: The results of this investigation suggest that bone wax may be a safe and efficacious implant material for medialisation laryngoplasty. Further studies are necessary to assess its long-term safety and efficacy.

Proliferative verrucous leukoplakia: a clinicopathological comparative study.

A retrospective clinicopathological analysis was performed to compare 35 proliferative verrucous leukoplakia (PVL), 40 leukoplakia without dysplasia (LK), 48 oral lichen planus (OLP)/oral lichenoid lesions (OLL), and 11 verrucous carcinoma (VC) (N = 134). The PVL group comprised 24 female and 11 male patients (mean age 66.5 years), with two to six sites involved (mean 3.1 sites) and multiple biopsies over time (mean 7.1/case). All PVL cases developed malignancy: 77.1% squamous cell and 40% verrucous carcinoma; 68.6% had multiple sites of malignancy. None showed local or distant metastatic spread. Five-year disease-specific survival was 88.6%. In LK and OLP/OLL, malignant transformation was significantly lower than in PVL (2.5% and 2.1%, respectively). Invasive squamous cell carcinoma was not reported in any conventional VC. Immunohistochemical histomorphometric analysis for p53, COX-2, and podoplanin showed no significant differences between the groups. PVL may overlap with LK, OLP/OLL, and VC, but has a persistent aggressive behaviour and high malignant transformation rate. The overlapping features may delay recognition as PVL. The results emphasize the need for a detailed clinicopathological definition of PVL, and long-term close monitoring to ensure progression to PVL and malignancy are recognized in time. The management of this persistent aggressive condition is challenging.

CoblationTM-assisted excision of suprastomal granulation tissue.

BACKGROUND: Suprastomal granulation tissue is a common complication of long-term tracheostomy. It may be associated with bleeding, aphonia, airway obstruction and delayed decannulation. METHODS: This study describes the experience of a tertiary paediatric medical centre with CoblationTM-assisted suprastomal granulation tissue excision. RESULTS: Thirteen children (mean age, 5.7 years) who underwent the procedure from 2013 to 2019 because of delayed decannulation or aphonia were included. Lumen obstruction ranged from 50 to 90 per cent, with a mean of 68.8 per cent. After the procedure, decannulation was successfully performed in 7 patients, and voice quality improved in 10 patients. There were no peri- or post-operative complications. CONCLUSION: This is the largest series to date that describes Coblation used for the treatment of suprastomal granuloma. Coblation has advantages of high precision, relatively low temperature (thereby avoiding thermal injury to adjacent tissue), haemostatic resection and feasibility for use for even large granulomas. The promising results should prompt further studies in larger samples.