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Lateral wall of maxillary sinus

The lateral wall of the maxillary sinus forms the outer boundary of the maxillary sinus and separates the sinus cavity from the facial soft tissues and infratemporal region. It is composed primarily of the zygomatic process of the maxilla and contributes to the facial contour and structural integrity of the midface.

This wall is of particular importance in maxillofacial surgery, dental procedures, trauma assessment, and radiologic evaluation of sinus disease and facial fractures.

Synonyms

  • Zygomatic wall of the maxillary sinus

  • Facial wall of the maxillary sinus (often used interchangeably, though facial wall is more anterior)

Location

  • Forms the lateral boundary of the maxillary sinus

  • Part of the maxilla

  • Lies medial to the facial soft tissues of the cheek

  • Lateral to the maxillary sinus cavity

  • Inferior to the orbit

  • Anterior to the infratemporal fossa

Anatomical components

  • Zygomatic process of the maxilla

  • Thin cortical bone forming the sinus wall

  • Inner surface lined by Schneiderian membrane (respiratory mucosa)

  • Outer surface related to facial muscles and soft tissues

Relations

Laterally:

  • Facial soft tissues of the cheek

  • Muscles of facial expression (e.g., levator labii superioris)

Medially:

  • Maxillary sinus cavity

  • Respiratory mucosa

Superiorly:

  • Orbital floor (inferolateral orbit)

Inferiorly:

  • Alveolar process of the maxilla (posterior maxillary teeth region)

Posteriorly:

  • Infratemporal surface of the maxilla

  • Infratemporal fossa

Structures related to the lateral wall

  • Posterior superior alveolar nerves and vessels

  • Facial soft tissues of the midface

  • Maxillary sinus mucosa

  • Zygomatic buttress

Function

  • Structural support: Contributes to facial contour and strength of the midface

  • Protection: Shields the maxillary sinus from lateral facial trauma

  • Surgical landmark: Important reference in sinus surgery and maxillary approaches

  • Dental relevance: Closely related to posterior maxillary teeth and implant planning

X-ray appearance

Paranasal sinus radiographs (Waters’ view):

  • Lateral wall: Smooth curvilinear bony outline of the maxillary sinus

  • Cortical margins: Thin but well-defined

  • Symmetry: Usually symmetric bilaterally

  • Soft tissue: Overlying facial soft-tissue shadow visible

CT appearance

Non-contrast CT:

  • Lateral wall: Thin hyperdense cortical bone forming the sinus boundary

  • Sinus cavity: Air-filled and hypodense relative to bone

  • Zygomatic buttress: Appears as a thicker bony region laterally

  • Continuity: Wall integrity clearly assessed

Post-contrast CT:

  • Bony wall: No enhancement

  • Mucosa: Thin mucosal lining may enhance mildly

3D CT VRT appearance

Volume-rendered technique (VRT):

  • Lateral maxillary contour: Smooth convex facial surface

  • Zygomatic buttress: Prominent structural pillar

  • Surface anatomy: Clear depiction of maxillary sinus boundaries

  • Utility: Useful for trauma assessment and surgical planning

MRI appearance

T1-weighted images:

  • Cortical bone: Low signal intensity

  • Sinus cavity: Low signal (air-filled)

  • Marrow in adjacent maxilla: Intermediate to high signal

T2-weighted images:

  • Bone cortex: Low signal

  • Sinus air: Signal void

  • Mucosa: Thin low-signal lining

MRI image

MRI Lateral wall of maxillary sinus anatomy image -img-00000-00000

X-Ray image

Lateral wall of maxillary sinus