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Radiology Packet 12
Thorax - Mediastinum
8-year old Rottweiler
• Hx: The owner’s report that the dog has sounded hoarse for 3
weeks.
8-year old Rottweiler
•
RF
– There is a diffuse increase in interstitial opacity in the lung fields. Some small,
indistinct nodules are apparent.
– There is increased opacity in the perihilar region.
– In the lateral view there is widening and increased curvature of the angle
between the trachea and the right cranial bronchus and ventral deviation of the
caudal mainstem bronchi.
– The caudal mainstem bronchi are spread apart and compressed.
•
RD
– Hilar lymphadenopathy
– Possible sternal lymphadenopathy
– Interstitial lung pattern (reticulonodular)
•
R/O
– Lymphosarcoma
– Fungal pneumonia
14-year old Terrier
“Sandy”
• Hx: presented with a
chronic cough.
14-year old Terrier
“Sandy”
• RF
– Invagination of the dorsal tracheal membrane in the thoracic inlet region
principally during expiration.
– Tracheal ring mineralization.
– Mineralization of the airways.
• RD
– Collapsing trachea
5-year old Mixed breed dog
• Hx: Presented for evaluation of tachypnea and dyspnea.
5-year old Mixed breed dog
•
RF
– The cardiac silhouette cannot be evaluated due to increased opacity within the
pleural cavity.
– There is increased opacity of the thoracic cavity is due to the presence of free
pleural fluid. The fluid has caused retraction of the lung lobes from the sternum
as well as from the thoracic wall.
•
RD
– Pleural effusion
•
R/O
– Trauma
– Cardiac disease
– Presence of a cranial mediastinal mass
•
Next
– Thoracocentesis and repeat radiographs
– Ultrasound
11-year old Labrador
“Jed”
• Hx: Radiographs taken prior to surgery to remove a testicular mass.
11-year old Labrador
“Jed”
•
RF
– Abnormal large discrete soft tissue mass within the cranial thorax on midline
causing focal cranial mediastinal widening on the DV film.
– Caudal margin of the mass is nicely outlined on the lateral film.
– Spondylosis of the caudal thoracic spine is an incidental finding.
•
RD
– Large discrete cranial mediastinal mass
•
R/O
–
–
–
–
•
Lymphosarcoma
Thymoma
Mast cell disease
Branchial cyst
Next
– Ultrasound guided biopsy
10-year old Yorkie
“Jodie”
• Hx: One year history of coughing
10-year old Yorkie
“Jodie”
• RF
– Generalized heart enlargement.
– Left atrial enlargement appears to be impinging on the left mainstem
bronchus.
– The inspiratory and expiratory radiographs show collapse of the cervical
trachea on inspiration and collapse of the thoracic trachea and main
stem bronchi on expiration.
– Hepatomegaly.
• RD
– Tracheal or mainstem bronchial collapse
12-year old cat
• Hx: Presented to you because of severe respiratory distress.
12-year old cat
•
RF
– Opacification of the right middle lung lobe silhouetting with the caudal heart
border.
– Mild shift of the heart to the right may be present, although there is mild patient
rotation.
– Soft tissue opacity overlying the trachea at the level of the thoracic inlet (C2-C6).
•
RD
– Collapse of right middle lung lobe
– Irregular intraluminal tracheal mass
•
R/O
– Collapse of lung lobe due to a nodule
– Collapse of lung lobe due to altered respiratory efforts and intrathoracic pressure
because of the tracheal mass
– Feline asthma
17-year old Shetland Sheepdog
“Chanel”
• Hx: Presented for coughing.
17-year old Shetland Sheepdog
“Chanel”
• RF
– On the lateral view there is a soft tissue opacity over the heart base with
ventral displacement of the heart and trachea.
– On the DV view the soft tissue opacity at the hilar region, between the
mainstem bronchi and extending to the right.
– Narrowing of the T6-7 IV disc space (incidental finding)
• RD
– Heart base mass
• R/O
– Lymphadenopathy