Case report Year :2017 Month : April Volume : 6 Issue : 2 Page : RC04 - RC06 A Rare Case of Laryngeal Schwannoma – with Review of Literature Ravi Kandasamy, Devimeenal Jegannathan, Sanjay Kumar, Vignesh Sankaran, Sheeba Adimoolam Barathy 1. HOD, Department of Otorhinolaryngology, Government Kilpauk Medical College, Chennai, Tamil Nadu, India. 2. HOD, Department of Radiology, Government Kilpauk Medical College, Chennai, Tamil Nadu, India. 3. Assistant Professor, Department of Otorhinolaryngology, Government Kilpauk Medical College, Chennai, Tamil Nadu, India. 4. Assistant Professor, Department of Otorhinolaryngology, Government Kilpauk Medical College, Chennai, Tamil Nadu, India. 5. Postgraduate, Department of Otorhinolaryngology, Government Kilpauk Medical College, Chennai, Tamil Nadu, India.   Correspondence Address : Dr. Devimeenal Jegannathan, HOD, Department of Radiology, Government Kilpauk Medical College, Kilpauk, Chennai-600010, Tamil Nadu, India. E-mail: devinachi@gmail.com   ABSTRACT : Morphometry of body and neural arch of lumbar vertebrae is very crucial in manufacturing screws, interspinous implants as well as preoperative planning of surgeries involving dorsolumbar spine. Aim: To determine various dimensions of typical and atypical lumbar vertebrae. Materials and Methods: A descriptive osteological study was carried out which included 66 intact adult dry human lumbar vertebrae (53 typical and 13 atypical) which were free of any deformity or pathological features. All the 53 typical vertebrae were randomly obtained. The following parameters were measured with slide callipers- superior transverse diameter and superior antero-posterior diameters of vertebral foramen; transverse diameter, antero-posterior diameter and anterior height of vertebral body; width, height of pedicles; interpedicular distance; maximum thickness of lamina; length of transverse process; maximum length, maximum height and maximum central thickness of spinous process. The data was tabulated and analysed using Microsoft Excel software. Mean and standard deviation was calculated for each parameter. Unpaired t-test was applied and p-value was derived for parameters like width and height of pedicles, thickness of lamina and length of transverse process. The p-value<0.05 were considered as significant. Results: The vertebral foramen (superior transverse diameter- 20.41±2.54 mm, superior antero-posterior diameter- 13.3±2.04 mm); vertebral body (transverse diameter- 44.43±5.91 mm, antero-posterior diameter- 30.17±3.19 mm, anterior height- 24.01±1.84 mm); pedicle (width- 10.85±3.94 mm on left side and 11.04±4.01 mm on right side, height- 13.84±4.01 mm on left side and 13.8±1.93 mm on right side, interpedicular distance- 29.17±5.06 mm); lamina (thickness- 6.6±1.36 mm on left side and 6.85±1.34 mm on right side); transverse process (length- 20.94±4.01 mm on left side and 21.51±4.5 mm on right side); spinous process (maximum length- 26.01±3.73 mm, maximum height- 19.92±4.03 mm, maximum central thickness- 6.42±1.41 mm). The mean transverse diameter and antero-posterior diameter of vertebral foramen of atypical lumbar vertebrae were higher than those of the typical lumbar vertebrae and these differences were significant (p-value of 0.0001 for transverse diameter and p-value of 0.005 for antero-posterior diameter). Conclusion: Most of the parameters of atypical lumbar vertebrae were found to be more compared to those of typical lumbar vertebrae. This inference should be kept in mind during fixation of lumbar inter-spinous implants, designing of pedicular screws and spinal grafting. Keywords : Benign tumour, Laryngeal mass, Neurogenic tumour, Supraglottis   INTRODUCTION   REFERENCES 1. Souza LR, De Nicola H, Yamasaki R, Pedroso JE, Brasil OD, Yamashita H. Laryngeal schwannoma: a case report with emphasis on sonographic findings. Radiologia Brasileira. 2014;47(3):191-93. 2. Ramakrishnan Y, Issing WJ. Laryngeal schwannoma: case report and literature review. ISRN Otolaryngology. Volume 2011 (2011), Article ID 540643, 3 pages. 3. Nanson EM. Neurilemoma of the larynx: a case study. Head & neck surgery. 1978;1(1):69-74. 4. Plantet MM, Hagay C, De Maulmont C, Mahé E, Banal A, Gentile A, et al. Laryngeal schwannomas. European Journal of Radiology. 1995;21(1):61-66. 5. Brandner S. The genetics and molecular biology of neural tumours. Br J Cancer. 2010;102(4):784-85. 6. De Lozier HL. Intrinsic malignant schwannoma of the larynx a case report. Annals of Otology, Rhinology & Laryngology. 1982;91(3):336-38. 7. Rosen FS, Pou AM, Quinn FB. Obstructive supraglottic schwannoma: a case report and review of the literature. The Laryngoscope. 2002;112(6):997-1002. 8. Takumida M, Taira T, Suzuki M, Yajin K, Harada Y. Neurilemmoma of the larynx: (A case report). The Journal of Laryngology & Otology. 1986;100(07):847-50. 9. Kayhan FT, Kaya KH, Ylmazbayhan ED. Transoral robotic approach for schwannoma of the larynx. Journal of Craniofacial Surgery. 2011;22(3):1000-02. 10. Ingels K, Vermeersch H, Verhoye C, De Potter C. Schwannoma of the larynx: a case report. The Journal of Laryngology & Otology. 1996;110(03):294-96. 11. Sanghvi V, Lala M, Borges A, Rodrigues G, Pathak KA, Parikh D. Lateral thyrotomy for neurilemmoma of the larynx. The Journal of Laryngology & Otology. 1999;113(04):346-48.   TABLES AND FIGURES [Table / Fig - 1]   [Table / Fig - 2]   [Table / Fig - 3]   [Table / Fig - 4]   [Table / Fig - 5]   [Table / Fig - 6]   [Table / Fig - 7]   [Table / Fig - 8]   [Table / Fig - 9]

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