Matthew Tommack, D.O. October 13, 2018 · Brant W & Helms C. Fundamentals of Diagnostic Radiology ,...
Transcript of Matthew Tommack, D.O. October 13, 2018 · Brant W & Helms C. Fundamentals of Diagnostic Radiology ,...
Matthew Tommack, D.O. October 13, 2018
Chest radiography◦ Anatomy, pathology
Shoulder Radiography◦ Anatomy, pathology
Knee Radiography◦ Anatomy, pathology
AnatomyConsolidation
AtelectasisPulmonary EdemaPleural EffusionPneumothorax
Technique, type and quality
Ribs and spine Upper abdomen Soft tissues Borders of the
mediastinum/heart Lungs◦ Pneumothorax◦ Consolidation◦ Pleural effusion◦ Interstitium/vessels
When fluid/cells accumulate in lung◦ Alveolar (airspace) compartment◦ Interstitial compartment
In addition to increasing the lung density, the consolidation cancels the contrast between vessels and lung boundaries, and these structures disappear, ie silhouette sign
Air filled bronchi, normally invisible, will be contrasted by consolidation creating air bronchograms
RUL: right superior mediastinum (SVC) RML: right heart border RLL: right hemidiaphragm or right heart
border if medial RLL LUL: left superior mediastinum (aortic arch) Lingula: left heart border LLL: left hemidiaphragm or descending aorta
Obstructive / Resorptive◦ Endobronchial Lesion
Passive / Relaxation◦ Pleural Effusion, Pneumothorax
Compressive◦ Bulla
Cicatricial/Scarring◦ Radiation Fibrosis
Adhesive◦ Neonatal Respiratory Distress Syndrome/Hyaline
Membrane Dz
Lobar Segmental Subsegmental
(Plate/Streak) Round
Heart size on ideal PA film◦ Heart width should be less than 50% of chest cavity
width.◦ Cardiac enlargement is common in CHF
Normal upright upper lung pulmonary vessels 1/3 the size of basilar vessels.
Early CHF◦ Basilar edema causes shunt to upper lobe = cephalization
of flow. Interstitial edema◦ Thin Kerley B lines (septal lines) and thick bronchi
Parahilar alveolar edema◦ Usually symmetric and non-segmental
Measurement of the Cardiothoracic ratio: [(MRD+MLD)/ID]
A value of <0.5 is normal (<0.6 in infants). Enlargement may come from heart or
pericardium.
Pleural effusion is seen in many conditions◦ Heart failure◦ Tumor ◦ Pneumonia◦ Trauma
Obscures and compresses underlying lung Effusions are readily detected◦ Can point to underlying problem that may not be seen on
x-ray, ie infection, tumor On routine upright chest x ray, need 200-300 mL of
pleural fluid to blunt costophrenic angle On lateral view, need only 75cc to blunt posterior
costophrenic sulcus Lateral decubitus is most sensitive and can be helpful
to determine of fluid is loculated
Injury to the lung, either trauma or iatrogenic Air leakage into the pleural space Spontaneous cases (idiopathic) also occur Severity and duration of pneumothorax is made worse by increased airway pressure◦ Obstructive airway disease or positive pressure ventilation
If a "flap valve" mechanism is present, progressive enlargement of space may compromise cardiac filling and ventilation (tension pneumothorax) Expiratory films aid in detection
Skin folds often simulate pleural lines◦ True pleural line has air on both sides of a fine line◦ Most pneumothorax look-alikes have air on only one side
and are not real lines Mastectomy Bulla/blebs
Discussed normal chest x ray with development of approach
Common clinical pathologies Questions
Anatomy Pathology
Acromion Clavicle
Greatertuberosity
Lesser Tuberosity
Coracoid process
Glenoid
Glenohumeral Joint
Acromion Clavicle
coracoid
Glenoid
AcromionClavicle
Glenoid Face
FootprintLabrum
Cartilage
SupraspinatusTendon
footprint
Supraspinatus Bursa
Subscapularis
Supraspinatus Infraspinatus
Biceps Tendon
Fractures Dislocations Arthritis Calcific tendonosis Avascular necrosis Indirect signs of soft tissue injury Tumors
Humeral Head Fracture-can be very subtle and CT or MRI may be needed-surgical management depends on amount of humeral head involved and degree of displacement
Anterior Dislocation-most common type of dislocation-complications include Hill sachs impaction fracture and Bankart lesions as well as rotator cuff injury
AC Joint Injury-High Grade-Grading depends on degree of diplacement which relates to degree of soft tissue involvement
Osteoarthritis and chronic rotator cuff tear
Calcific Tendonosis, HADD-may be incidental, but can acute cause pain-supraspinatus is one of the most common sites-Treatment is usually conservative, but ultrasound guided lavage can be performed, surgery rarely needed
Avascular Necrosis-humeral head is second most common site behind hip-can lead to subchondral collapse-MRI is most sensitive for early detection in high risk patients
Cartilage forming bone tumor-enchondroma, chondrosarcoma-predilection for metaphasis of long bones, tubular bones of hands and feet-treatment depends on aggressive features and many times symptoms may be the only deciding factor
Anatomy Common Pathology Questions
Anatomy Pathology
Tibial Spines
Fibular Head
MCL PCL ACL
Menisci
Quadriceps Tendon
Patellar Tendon
ACL PCL
Suprapatellar Recess
Patellofemoral joint space
Menisci
Cartilage
Fractures Arthritis Osteochondral Lesions Signs of internal derangement Soft tissue injuries Tumors
Tibial Plateau Fractures-Treatment depends on severity of comminution, displacement, depression of subchondral bone, and associated soft tissue injuries-will generally go on to CT or MRI
Osteoarthritis-osteophyte formation, joint space loss, subchondral cyst, subchondral sclerosis
Transient dislocation of patella with joint effusion and osteochondral lesion
Arcuate Complex fracture and Segond Fracture-associated with ligament tears, MRI next -insertion of lateral stabilizing ligaments and tendons
Complete patellar tendon tear-patella alta and edema-can have associated bony fragment
Quadriceps Tendon Tear-can have patella baja, edema, bony fragment
Cartilage forming bone tumor-presumed enchondroma, ie no symptoms or aggressive features-can be small, cartilage rests
Osteochondroma-common about the knee-can cause symptoms most commonly due to mass effect or fracture-rarely degenerate into chondrosarcoma
Osteoid Osteoma-classic finding of night pain relieved by nsaids-can create exuberant periosteal rxn and can be distant from nidus
Can the pt receive contrast◦ Allergies◦ Renal function◦ Medical history◦ Medications
Does the pt need contrast◦ Can we answer the question without contrast◦ If we are going to give contrast, how can we optimize it’s
use Different ways to use contrast◦ Venous phase◦ Arterial phase◦ Delayed◦ Intrarticular◦ Outline lumen
Prior reaction to iodinated contrast Prior severe allergy to anything Kidney function, eGFR◦ Preexisting renal insufficiency◦ Over 60◦ Diabetes◦ metformin◦ Kidney disease◦ HTN◦ CVD◦ Solitary kidney◦ Transplant◦ Other factors contributing to nephrotoxicity Chemotherapeutic drugs myeloma
Biggest worry is nephrogenic systemic sclerosis, NSF, fibrosing disease of skin and subcutaneous tissues ◦ Identified in 2006 with association to GBCA’s◦ eGFR used to screen
Brain deposition-appears to be dose dependent◦ Safety alert announced in 2015, however no adverse
health effects have been discovered◦ Rigorous investigation on going
Well tolerated as IV contrast◦ Much lower rate of adverse rxn, 0.7-2.4%◦ And allergic rxn, 0.004-0.7%◦ No cross reactivity with GBCA and Iodinated contrast
media
Contrast◦ Vessels/vessel injury◦ Visceral enhancement◦ Bowel Wall enhancment◦ Identifying structures
adjacent to vessels or bowel
◦ Enhancement pattern Masses Liver, kidneys Excretory system
Ureters, bladder◦ Abscesses◦ Arthrograms Labrum, shoulder, hip Cartilage Post op
◦ Myelogram In pt who can’t have MRI
No contrast◦ Air Pneumothorax Pneumoperitoneum
◦ Calcification renal stones Sometimes gallstones
◦ CT lung cancer screening or lung nodule follow up
◦ Bones Fractures, alignment
◦ Head trauma/stroke
BOTH◦ Dissection, Aneurysm◦ Visceral masses, ie liver,
kidney, adrenal◦ urogram
Brant W & Helms C. Fundamentals of Diagnostic Radiology, 2nd ed. Philadelphia, PA: Williams & Wilkins. 1999.
Goodman L. Felson’s Principles of Chest Roentgenology, 2nd ed. Philadelphia, PA: WB Saunders Co. 1999.
Webb, Higgins. Thoracic Imaging Pulmonary and Cardiovascular Radiology. Lippincott. 2005 myweb.lsbu.ac.uk Resnick. Bone and Joint Imaging. 3rd edition. Elsevier. 2005 radiology.creighton.edu/introtocxray.html www.acr.org www.statdx.com www.radiologyassistant.com www.orthobullets.com Gottsegen, CJ, et al. Avulsion Fractures of the knee:Imaging findings and Clinical
Significance. Radiographics. Oct. 2008. 28:1715-1770. Markhardt, BK, et al. Schatzker Classification of Tibial Plaeau Fractures: Use of CT and MRI
Improves Assessment. Radiographics 2009. 29:585-597. www.radiopeadia.com www.sportsillustrated.com Netter. Atlas of Human Anatomy. 3rd edition. Elsevier.