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    Evaluation of morphological variations of petrotympanic fissure using computed tomography imaging of the temporal bone
    (Elsevier, 2022) Serindere, Mehmet; Serindere, Gozde; Gunduz, Kaan; Kopuz, Cem
    Purpose: Petrotympanic fissure (PF) is important for both dentists and otolaryngologists to know the tempo-ral anatomy well especially for pre-surgical radiological evaluations. Computed tomography (CT) is indis-pensable method for temporal bone imaging. The purpose of this study was to evaluate PF morphology and position using CT. Methods: CT scans of 300 patients (600 PFs) were retrospectively evaluated. PF types were recorded by divid-ing into 3 groups (Type 1,2 and 3). Length of the mandibular fossa (MF) and PF, vertical diameter (VD) of the PF at the MF level, midpoint and tympanic cavity (TC) level were measured. PF position types were subdi-vided as low, midline and high. Results: Type 1, 2 and 3 was found in 18.7%, 51.5% and 29.8% of the cases, respectively. The mean length of the MF and PF was 18.33 mm and 3.77 mm, respectively. The mean VD of the PF at the MF level, midpoint and TC level was 1.71, 0.98 and 0.97 mm, respectively. The low, midline and high position of PF was observed 14.5%, 54.3% and 31.2% of the cases, respectively. Conclusion: Length of the MF and PF in males was significantly higher than females. VD of the PF at the MF level in Type 1 and Type 3 was significantly higher than type 2. In type 1,VD of the PF at the midpoint was sig-nificantly higher than type 2 and type 3. VD of the PF at the TC level in Type 1 and Type 3 was significantly higher than type 2. (c) 2022 Elsevier Masson SAS. All rights reserved.