What Are the Characteristics of the Upper Airway in Patients With Craniofacial Microsomia?

PURPOSE: Obstructive sleep apnea (OSA) is a common problem in patients with craniofacial microsomia (CFM); however, the exact pathophysiology in patients with CFM remains unclear. The first aim of this study was to evaluate upper airway volume and morphology in patients with CFM. The second aim was to identify risk factors for the presence of OSA. MATERIALS AND METHODS: A cross-sectional study was set up and 3 study groups were identified: 1) CFM with OSA, 2) CFM without OSA, and 3) control. Computed tomographic (CT) scans of the head and neck were included and used to create 3-dimensional models. The age-matched control group consisted of patients evaluated for traumatic head injury or epilepsy. Volumetric and morphologic parameters were measured. The results of patients with CFM were compared among the 3 study groups. Descriptive statistics were computed using the Pearson χ2 test for categorical variables and nonparametric tests for continuous variables. A multiple variable regression model was used to identify risk factors for OSA. RESULTS: In total, 79 patients with CFM were included, of which 25 patients were diagnosed with OSA. A total of 145 CT scans could be analyzed. In addition, a control population of 88 patients was identified. Oropharynx volume, mean cross-sectional area (CSA), minimal CSA, and minimal retropalatal area were found to be markedly smaller in patients with CFM compared with the control population. In contrast, in patients with CFM and OSA, minimal retroglossal area, sphericity, and uniformity markedly differed from those in patients without OSA. Sphericity was identified as the main predicting variable of OSA in patients with CFM. CONCLUSIONS: The upper airway of patients with CFM is markedly smaller and puts them at risk for developing OSA. Patients with CFM diagnosed with OSA have a markedly smaller CSA behind the base of the tongue and a difference in sphericity.

Depth of invasion in early stage oral cavity squamous cell carcinoma: The optimal cut-off value for elective neck dissection.

OBJECTIVES: Depth of invasion (DOI) is the most important predictor for lymph node metastasis (LNM) in early stage (T1-T2) oral cancer. The aim of this study is to validate the cut-off value of 4 mm on which the decision to perform an Elective Neck Dissection (END) is made. MATERIALS AND METHODS: We performed a retrospective study in patients with pathologically proven early stage oral cavity squamous cell carcinoma (OCSCC) without clinical or radiological signs of LNM, who were treated between 2013 and 2018. An END was performed when DOI was ≥ 4 mm and a watchful waiting protocol was applied in patients with DOI < 4 mm. RESULTS: Three hundred patients were included. END was performed in 77% of patients with DOI ≥ 4 mm, of which 36% had occult LNM (pN+). Patients in the watchful waiting group (48%) developed a regional recurrence in 5.2% for DOI < 4 mm and 24.1% for DOI ≥ 4 mm. For DOI ≥ 4 mm, regional recurrence free survival was higher for patients who were treated with END compared to watchful waiting (p = 0.002). A Receiver-Operator-Curve -analysis showed that a DOI cut-off value of 4.0 mm was the optimal threshold for the prediction of occult LNM (95.1% sensitivity, 52.9% specificity). CONCLUSION: A DOI of ≥ 4 mm is an accurate cut-off value for performing an END in early stage OCSCC. END results in higher survival rates and lower regional recurrence rates in patients with DOI ≥ 4 mm.