CT of Maxillofacial Injuries
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1 CT of Maxillofacial Injuries Stuart E. Mirvis, M.D., FACR Department of Radiology University of Maryland School of Medicine Viking MGS 2001 Technology changes the diagnosis
2 Technologic Evolution Topics to Cover Struts and buttresses Orbital fractures Naso-orbital ethmoid (NOE) Zygomaticomaxillary complex (ZMC) Le Fort midface patterns Ocular Mandible Boom!
3 Anterior coronal struts consisting of frontal (1 ), zygomaticofrontal (2), nasofrontal (3), anterior maxillary (4), anterior alveolar (5) components. Facial Struts Posterior coronal struts consisting of posterior wall of maxillary sinus (1) and pterygoid plates (2) Gentry LR, et al. High-Resolution CT Analysis of Facial Struts in Trauma: 1. Normal Anatomy. AJR 140: , March 1983 Horizontal struts superior (1), middle (2), and inferior (3) parts. Sagittal struts consisting of median (1 ), parasagittal(2), and lateral (3) parts Concept of Facial Buttresses Major support for facial skeleton to maintain form and function (I beams) Attach directly or indirectly to skull base or cranium 3 vertical and 3 horizontal Buttresses accommodate screw fixation Maintain facial width and height Hopper RA, Salemy S, Sze RW. Diagnosis of Midface Fractures with CT: What the Surgeon Needs to Know. RadioGraphics 2006; 26: Establish functional support (orbits and teeth)
4 Highlights of Facial Anatomy - Orbit Orbital sutures and thin orbital bony plates allow suture diastasis and fractures of thin bone to absorb impacting energy. This mechanism plus orbital fat and muscles cushions the globe and preserves vision in high-energy impacts to the orbit. Orbital Blow-out out Fractures: Significant Imaging Features Eid Evidence of muscle or ft fat entrapment t (position/shape of muscle) Pure or impure fracture (?intact inferior orbit rim) Orbital hematoma (up to 24% orbital injuries) Complications: enopthalmous, diplopia, hypoesthesia Size (area) of floor defect or associated fractures Calculations of blow out fractures ofthe orbital floorby 3D CT and 2D CT method are accurate for assessing the area of fracture and the volume of herniated tissue * * Ploder O, 2D- and 3D-based measurements of orbital floor fractures from CT scans. J Craniomaxillofac Surg. 2002
5 Orbital blow-out fracture Orbit Blow-out out Fracture
6 Herniated Inferior Rectus Orbit Blow-out Fracture
7 Medial orbital wall fracture Isolated or associated 20-40% with floor fracture More common to cause orbital emphysema Rarely surgically repaired Complications: Horizontal gaze palsy, enopthalmous, epistaxis Medial Orbital Blow-out out Fractures
8 Medial wall fracture - entrapment Medial blow-out with herniation
9 Orbital Blow-in fracture Orbital Blow-in fracture: MRI with brain herniation
10 Orbital Blow-up fracture Rare Orbital roof fragments explode into frontal lobe Typical dural tears and CSF leak Frontal sinus involvement common Orbital blow-up fracture
11 Orbital Blow-up fracture Naso-orbital-ethmoid Complex Nasal bridge, lower frontal sinus, medial orbits Comminution, depression, and lateral spread of bones Soft tissue injury; medial canthal ligament, lacrimal drainage, nasofrontal sinus s Usually associated fracture patterns
12 Naso-orbital Ethmoid Fractures N= 21 Clinical findings: Widened intercanthal distance (71%) Increased nasofrontal angle (28%) Epistaxis (100%) Visual disorder (62%) Cerebrospinal rhinorrhea (33%) Enophthalmos (23%) Facial paralysis (14%) Naso-orbital-ethmoid Complex
13 Naso-orbital-ethmoid Complex NOE and repair
14 Nasomaxillary Fracture Kicked by horse Sagittal mid-face pattern
15 Zygomatic-maxillary Complex (ZMC) Impact on malar eminence 4- point fracture Displaces posterior and medially Simple type vs. hi-grade variant Zygomaticmaxillary Complex (ZMC) Always involves orbital floor May involve medial orbit wall Lateral canthal ligamant and inferior orbital nerve Coronoid process impact
16 Zygomatic-maxillary Complex (ZMC) hi-grade Zygomatic-maxillary Complex (ZMC) Higrade
17 Complex ZMC Orbital Apex Syndrome Optic neuropathy and ophthalmoplegia Loss of cranial nerves II, III, IV, opthalmic division of V, and VI Blindness, fixed dilated pupils, proptosis, ptosis Causes: inflammatory, infectious neoplastic, iatrogenic/traumatic, and vascular conditions
18 LeFort Fracture Patterns Described as symmetric mid face lines of weakness experimental Often asymmetric clinically and combined with ZMC, NOE Always involves pterygoid plate lt fractures Higher energy usually leads to higher grade Any pattern of Lefort 1,2,3 fractures can occur In 1901 the French surgeon, Dr. Rene LeFort ( ), French army surgeon from Lille, published his results from experiments aimed to describe fracture patterns. He performed a number of experiments on cadaver heads. These experiments included blows to the cadaver head at different angles with a wooden club. He also hurtled the head against stationary objects and kicked it in various places in the face
19 LeFort Fracture Patterns LeFort Fracture 1 Fracture all 6 walls of maxillary sinuses Floating palate Typically: nasal septum & maxillary nasal spine Airway compromise - rare
20 LeFort Fracture I + LeFort II Fracture Patterns Mobile nose and maxilla (a portion of the upper transverse maxillary buttress [orbital rim] is involved in mobile segment) Fx. Lateral maxillary sinus, medial orbital floor, nasal bridge, g,pterygoids (pyramidal) Soft tissues: medial orbit, infraorbital nerve Frontomaxillary Zygomaticomaxillary
21 LeFort 2 Lefort II and NOE
22 LeFort Fracture III Unilateral LeFort 2/3
23 LeFort Fracture III Lefort II/III: highly comminuted
24 Combined LeFort Fracture Pattern - Smash
25
26 GSW through the medial orbit monocular blindness
27 Mandibular Fractures Mandibular Fractures Fracture Type Prevalence Body % Angle % Condyle % Symphysis 7-15 % Ramus 3-9 % Alveolarl 2-4% Coronoid process 1-2 %
28 Mandibular Angle Fracture
29
30 ORIF angle/body fx oops! Mandibular Fracture Dislocation
31 Mandible fracturedislocation (sagittal split) Mandibular Fracture - Dislocation
32 Bilateral TMJ dislocation - yawning LeFort I/II/III: Comminuted mandible fractures
33 Attempted suicide: Bit blasting cap GSW: Facial explosion
34 Fibular graft reconstituting maxillary contour
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