TCM 2 Exam - First Semester Flashcards
Compare the position of the patient in AP and PA.
AP: supine
PA: upright
Compare the scapula of the patient in AP and PA.
AP: scapula projecting overlapping lung fields
PA: scapula does not overlap lung fields
Compare the clavicles of the patient in AP and PA.
AP: clavicles project above the inlet of the thorax
PA: clavicles project over the upper chest
Compare the air fluid levels of the patient in AP and PA.
AP: no air fluid levels in abdomen or chest
PA: air fluid levels in abdomen or chest
Compare the penetration of the patient in AP and PA.
AP: underpenetrated (too white, not enough rays going through the body)
PA: Penetration and exposure are normal
How can you tell if the patient is centered?
- Draw a line along the central spinous process
- Draw a line between the medial end of the clavicles.
- If the distance between the medial and of the clavicle and midline is equal, the patient is centered. If not, they are not (rotated in the direction of the longer line)
When not enough x-rays reach the plate, it is considered ___. When too many reach the plate, it is considered ___.
Underpenetrated; overpenetrated
With proper inspiration, where should the right diaphragm be located?
Between the 9th and 10the posterior ribs
What is the AP (aortico-pulmonary) window? When is this window changed?
Concave space between the aortic knob and the main pulmonary artery
Lymphadenopathy can lead to loss of the concavity
The heart is bigger in which view (AP vs. PA)?
AP
What are the three types of lung abnormalities that can be seen on CXR?
- Cavity
- Mass
- Consolidation
What is a consolidation?
Abnormal material in the alveoli or airspaces (fluid, pus, collapsed alveoli)
What is one hallmark of alveolar/airspace disease or consolidation?
Air bronchogram
Why do bronchi become visible in an air bronchogram?
Because of the density contrast between normal air in the bronchi and abnormal fluid in the surrounding alveoli
Consolidation may be secondary to pneumonia or atelectasis. How can you tell the difference?
Pneumonia: no volume loss
Atelectasis: volume loss, elevation of right minor fissure
What does a silhouette sign indicate?
Loss of silhouette (outline) is abnormal and indicates that there is airless, consolidated lung adjacent to that structure
What type of consolidation leads to obscuring of the left heart border?
Lingula consolidation
What type of consolidation leads to obscuring of the right heart border?
Right middle lobe consolidation
What distinguishes atelectasis and pneumonia on CXR?
In atelectasis, there is a forward shift of the oblique/major fissure on lateral CXR, which indicates loss of lung volume.
What distinguishes atelectasis and pneumonia clinically?
Atelectasis: hypoxia, no fever
Pneumonia: fever, cough
True or false - fissures are not normally seen unless outlined by an abnormal lung.
True
What are the three types of atelectasis and what causes them?
- Resorptive (endobronchial obstruction)
- Adhesive (loss of surfactant)
- Relaxation (loss of negative pressure in the pleural space)
What are the CXR features of resorptive atelectasis?
- Triangular density without air bronchogram
- Loss of lung volume
- Minor/horizontal fissure is elevated
- Compensatory hyperinflation
What is on the differential for a white out on CXR?
- Resorptive atelectasis (would show signs of decreased volume, mediastinum moves toward affected side)
- Pleural effusion (would show signs of increased volume, mediastinum moves away from affected side)
What are the types and sizes of solitary round lesions in the lung?
- Lung mass: >3 cm
- Solitary lung nodules: 1-3 cm
- Lung nodules <1 cm
How can lesions be differentiated from collapse or consolidation?
Distinct, sharply demarcated borders
How is a cavity defined/identified?
Dense mass with a central lucency (black area) - this indicates air in the center (lung abscesses, necrotic tumor)
If a cavity is in the apex of the lung, consider ___.
TB
How can you differentiate between a lung abscess and a necrotic lung tumor based on the clinical history?
Abscess: pneumonia, fever, cough for weeks
Tumor: weight loss, hemoptysis for months
How can you distinguish between diffuse alveolar disease and diffuse interstitial disease?
Alveolar: confluent density over a broad area
Interstitial: lines (reticulonodular - lines and dots), ground glass/hazy density
What are features of diffuse alveolar disease on CXR?
- Soft fluffy densities over a broad area
- Butterfly distribution (central, near hila, bilaterally symmetric)
- Air bronchogram
What are some possible causes of acute diffuse alveolar disease?
- Pulmonary edema
- Pulmonary hemorrhage
- Influenza
- ARDS
How is cardiomegaly defined on CXR?
Width of the heart is >50% of the width of the chest
What features on CXR supports pulmonary edema rather than ARDS or hemorrhage?
Cardiomegaly
What are the three phases of CHF?
- Vascular phase
- Interstitial phase
- Alveolar phase
What is seen on CXR in the vascular phase of CHF?
Cephalization of pulmonary blood flow
What is seen on CXR in the interstitial phase of CHF?
Kerley B lines (interstitial, short straight lines that extend to the pleural surface)
What is seen on CXR in the alveolar phase of CHF?
Basal and bilateral “batwing” densities close to the hila, pleural effusions, and cardiomegaly
What are the features of COPD on CXR?
- Hyperinflated lungs (flattened diaphragm, retrosternal air)
- Hyperlucent lungs
- Blebs - EMPHYSEMA ONLY
- Avascular zones
What are the features of pleural effusion on CXR?
- Homogenous density
- Dependent position
- Loss of diaphragm and costophrenic angle
- Slanting meniscus
- Mediastinal shift to opposite side
What are the features of a PT?
- Loss of normal lung vascular markings in the periphery of the chest (black)
- Visible pleural/lung interface
- Relaxation atelectasis
- Mediastinal shift to opposite side
- Enlarged hemithorax
What are some causes of mediastinal widening?
- Mediastinal nodes
- Mediastinal mass
- Aortic aneurysms
What are the two most common tubes and where are they located?
ET (trachea)
NG (esophagus)
Where should the ETT tip be located?
Between the carina and suprasternal notch (T1 vertebral body level)
Where should the feeding tube tip be located?
At the junction of the fourth duodenum and jejunum (duodenum is C shaped)
What is a systematic approach to reading CXRs?
Airway Bones Cardiac shadow Diaphragm Everything else (abdomen, breast, neck, axilla, soft tissue)
Lung fields
Mediastinum
Pleura
How is the trachea recognized on CXR?
Tracheal rings, lumen is filled with air
Where does the trachea split into left and right main stem bronchi?
Carina
Why is the right diaphragm slightly higher than the left?
Heart pushes down on the left side
Which lung is larger?
Right
99% of the lungs are alveoli filled with air and appear ___ as a result (normally).
Dark
Which hilum is higher?
Left
Where are vascular markings more prominent?
- Base of the lungs (vs. apex)
2. Inner 2/3 (vs. outer 1/3)
What is the mediastinum?
Space between the left and right lung
A consolidation will not typically cross a ___.
Fissure
What are the signs of volume loss?
- Global shift of structures toward the atelectatic lung
- Movement of fissures and hila
- Compensatory hyperinflation of the rest of the lung
What are the CXR features of relaxation atelectasis?
- Primary event is in the pleural space
- Trachea shifted away from the affected side
- Entire lung is atelectatic
*usually a PT
What are the CXR features of adhesion atelectasis?
- Diffuse white out with smaller lungs
When are multiple vs. single cavities seen?
Multiple: hematogenous etiology (metastatic, septic emboli, vasculitis) or bronchogenous (aspiration abscess, TB, coccidiomycosis), bronchiectasis
Single: primary lung cancer, post-traumatic lung cyst, others
When can aspiration abscess be ruled out?
When the cavity is located in the apical segment of the upper lobes
What is on the differential for mass lesions?
Malignancy (cancer, lymphoma, sarcoma), blastomycosis, Wegner’s granulomatosis
What is on the differential for solitary pulmonary nodules?
Carcinoma, benign tumors, granulomas
What is on the differential for miliary nodules?
Granulomas (miliary TB, sarcoid, eosinophilic granuloma, silicosis)
What is the differential for an anterior mediastinal mass?
- Thymoma
- Teratoma
- Testicular tumor metastasis (germ cell tumor)
- Terrible lymphoma
- Thyroid