CT anatomy of paranasal sinuses.

This poster is published under an open license. Please read the disclaimer for further details.

Congress:

ECR 2017

Poster Number:

C-2117

Type:

Educational Exhibit

Keywords:

Anatomy, Ear / Nose / Throat, CT, Education, eLearning, Education and training

Authors:

O. Dib¹, H. Chahinez², B. Asma¹, C. abdelouahab¹, M. Ourrad El³, B. Nacereddine¹; ¹Algiers/DZ, ²16000/DZ, ³Alger/DZ

DOI:

10.1594/ecr2017/C-2117

DOI-Link:

https://dx.doi.org/10.1594/ecr2017/C-2117

Fig. 1: Figure 1. Anatomic representation of paranasal sinuses

Fig. 2: Figure 2. Coronal and sagittal CT slices showing the paranasal sinuses drainage...

Fig. 3: Figure 3. CT scan acquisition in supine position from the top of the frontal...

Fig. 4: Figure 4. Axial, coronal and sagittal planes are helpful for a good...

Learning objectives

•To recall the normal anatomy of paranasal sinuses. •To know anatomic variations of paranasal sinuses. •To have a systematic way in looking for these variations in a CT scan.

Background

1.The paranasal sinuses are the frontal, ethmoid, sphenoid and maxillary sinuses, housed within the bones of the skull (figure 1). All sinuses open into the lateral wall of the nasal cavity through their corresponding ostia (figure 2). The lateral wall of nasal cavity has three projections of bone called superior, middle and inferior nasal conchae. The space below each concha is called a meatus. Inferior meatus: receives opening of lower end of nasolacrimal duct. Middle meatus: Lies below the middle concha, It has a rounded...

Findings and procedure details

A/ CT anatomy: Ostiomeatal unit: It is a complex anatomic region at crossroads of mucociliary drainage from frontal, anterior ethmoid sinuses and maxillary sinuses. Components of anterior osteomeatal unit are (figures 5, 6): Maxillary ostium: drainage channel of maxillary sinus. Infundibulum: common channel that drains the ostia of maxillary and ethmoid sinuses to the hiatus semilunaris. Uncinate process: hook like process that arises from posteromedial aspect of nasolacrimal duct and forms the anterior boundary for hiatus semilunaris. Ethmoid bulla: usually a single air that projects...

Conclusion

The paranasal sinuses have many different anatomical variations. Computed tomography (CT) scan plays a fundamental role in the diagnosis of anatomical variations. The identification of the anatomical variations helps the endoscopic surgeons to avoid major risks in approaching the vital anatomical structures.

Personal information

Dr DIB OTHMANE Hopital central de l'armée , Alger, Algérie

References

1/An Analysis of the Anatomic Variations of the Paranasal Sinuses and Ethmoid Roof Using Computed Tomography; Hatice Kaplanoglu1, Veysel Kaplanoglu2, Alper Dilli1, Ugur Toprak2, Baki Hekimoğlu1 , Eurasian J Med 2013; 45: 115-25 2/Radiographic Analysis of the Ethmoid Roof based on KEROS Classification among Filipinos , Justin Elfred Lan B. Paber, MD1 Michael Salvador D. Cabato, MD2 Romeo L. Villarta, Jr, MD, MPH3 Josefino G. Hernandez, MD3, Philippine Journal of otolaryngology-head and neck Surgery Vol. 23 no. 1 January – June 2008 3/The International Frontal...