radiology for ent students - · pdf filexray pns water’s view showing • opacity in...
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RADIOLOGY for ENT students
Department of ENTKSHEMA
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PARANASAL SINUSES
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NASAL BONE FRACTURENASOPHARYNXMASTOIDSSOFT TISSUE NECKFBBARIUM SWALLOW
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PARANASAL SINUSES
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Xray PNS Water’s view showing
• Opacity in B/L maxillary sinuses
• Diagnosis:– B/L Maxillary sinusitis
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Xray PNS Water’s view showing
• Opacity in Right maxillary sinus
• Diagnosis:– Rt. Maxillary sinusitis
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Xray PNS Water’s view showing
• Radiodense lesion / opacity in Left maxillary sinus & Left nasal cavity
• Diagnosis:– Lt. AntroChoanal Polyp
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Xray of PNS – Water’s view showing Rt. Antral Polyp
• Opacity seen in Rt. Maxillary sinus
• Convexity upwards
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Xray PNS Water’s view showing
• Opacity seen in Rt. Maxillary sinus
• Tooth on the medial wall
• Thinned out Sinus walls
DIAGNOSIS:Dentigerous cyst
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Xray PNS Water’s view showing
• Opacity seen in Rt. Maxillary, ethmoidal & Frontal sinuses
DIAGNOSIS:Rt. Pansinusitis
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Water's - best for maxillary sinus (Ethmoids and frontals too far from film)
45
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Basic Patient Position
The patient sits erect facing the bucky, midsagittal plane in the midline of the film, coronal plane parallel to the film interpupillary line parallel to the floor. The chin is raised to bring the orbital meatal line at 45 degrees to the film.In some centers the patient is imaged mouth open to demonstrate the sphenoid sinuses.
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Central RayThe horizontal central ray is centered in the midline of the occiputso that the emergent ray exits the patient in the midline at the level of the anterior nasal spine at the upper border of the maxilla.Note the projection requires an angle of 45 degrees between the OM line and the central ray if the patient is unable to raise the chin sufficiently then the central ray may need to be angled caudally to maintain the 45 degree angle.
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Facial Bones OM AnatomyMeschan, I. 1955 An Atlas of Normal Radiographic Anatomy Saunders,
London
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Caldwellbest for ethmoids and frontal sinus
(Temporal bones overlie maxillary)
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Common radiologic abnormalities:• Air-fluid levels suggest an acute process• Opacification = secretions, polyps, etc. • (Ethmoids should be slightly darker than orbits) • Thickened mucosa (check lateral maxillary wall):
Suggests chronic inflammation • Maxillary sinus retention cysts
– Very frequent finding – Harmless unless symptomatic
• Frontal sinus mucocele– Nasofrontal duct obstruction (head injury?) – Potentially serious problem – Look for loss of scalloped edge
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NASAL BONE FRACTURE
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Fracture Nasal bones
• If displacement +• No edema- reduced immediately• If edema +
– Symptomatic treatment till edema subsides for 5-7 days
– Fracture reduced after edema has subsided– May be combined with septorhinoplasty at a
later date
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Nasopharynx
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Xray Nasopharynx – lateral view
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Look for
• Look for radio-dense lesion • Nasopharynx air shadow• In Adenoids – anteroinferiorly• In Antro-choanal polyp- postero-superiorly
– Called as “ crescent sign”
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MASTOIDS
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What to look for:
1. TMJ2. EAC3. Sinus plate4. Dural plate5. Sino-dural angle
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Importance• Anatomical variations like:
– Low lying dural plate– Forward lying sinus plate
• Bony erosions• Extent of pneumatization- Pattern:
– Cellular– Diploic– Sclerotic
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Various views for mastoid• LAW’s view- lateral Oblique view• Owen’s• Schuller’s view• Towne’s
• Meyer’s • Stenver’s
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Citelli’s angle
•Acute – in primary sclerosis
•Obtuse- in secondary sclerosis ( due to CSOM)
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DD for cavity
1. Cholesteatoma
2. Large antrum
3. Post-op cavity
4. Eosinophilic granuloma
5. TB mastoiditis
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To differentiate operated cavity from cholesteatoma
• Margins - irregular due to osteogenesis
• Appearance - Homogenous• ME & Mastoid area• Sclerosis absent
• Smooth
• Cotton wool appearance• Only in mastoid area• Present
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RETROPHARYNGEAL ABSCESS
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Look for1. Cervical vertebrae
• Erosion of vertebral bodies- No.• Loss of cervical Lordosis – due to prevertebral muscle
spasm2. Pre-vertebral soft tissue shadow
• Should be < 2/3 of AP diameter of cervical vertebral body
• If > suspect Retropharyngeal abscess• Look for FB / Air fluid level / Gas shadow
3. Air collumn in trachea4. Hyoid bone & Laryngeal cartilage ossifications
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Chronic Retropharyngeal
abscess
•Secondary to TB spine(Pott’s spine)
•Erosion of cervical vertebra
•Treatment with ATT
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FB Cricopharynx with Acute retropharyngeal abscess
• Look for gas shadow-radiolucency
• Look for air fluid level
• Esophagoscopyunder GA
• Removal of FB• Intra-oral
drainage of RPA• Parenteral
antibiotics
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Complication of esophagoscopy
• Esophageal perforation• May lead to mediastinitis• Detected by
– Interscapular pain ( mediastinitis)– Low volume pulse + tachycardia = SHOCK
• Managed by– Rx of hypovolemic /septicemic shock– Adequate airway/ ventillation– Drainage of hydropneumothorax
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FOREIGN BODIESNOTE:
•Shape of object
•Position in relation to the cervical vertebrae on lateral radiograph
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X ray neck AP view•Round radio opaque object ( ? Coin)
•In Esophagus
• Because the esophagus is an AP compressed tubular structure
•A coin would occupy this position
•Can be confirmed by lateral view
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X ray neck Lateral view
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BARIUM SWALLOW•Achalasia Cardia
•Regular dilatation of esophagus
•Air fluid level
•Abrupt stricture formation
•“Rat tail appearance / Bird beak appearance”
•Malignancies
“Shouldering effect” – due to everted margins of malignant ulcer
Proximal dilatation
“ Apple core appearance” -
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Contrast Xray – Barium Swallow •Irregularity of mucosa
•Shouldering effect
•Persistent
•Lower third of esophagus
•Proximal dilatation
Diagnosis:
? Malignancy of Lower third of esophagus
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Contrast Xray – Barium Swallow •Irregularity of mucosa
•Shouldering effect
•Persistent
•Middle third of esophagus
Diagnosis:
? Malignancy of Middle thrid of esophagus
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Contrast Xray – Barium Swallow •Shelf like projection at the level of C5/C6
•Cricopharyngeal web seen in Plummer Vinson Syndrome
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Barium sulphate
• DISADVANTAGES1. Outside the lumen of
GIT acts as FB2. Contrast in
Mediastinum leads to inflammatory response
• ADVANTAGES1. Inert2. Suspendible in water3. Very minimal
absorption in GIT4. Contrast is not
degraded
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