Thorax Cancers In Dogs And Cats

Cancers affecting the thorax and respiratory system include primary lung tumours, metastatic lung disease, mediastinal tumours and tumours of the trachea or chest wall. While primary lung tumours are relatively uncommon in dogs and cats, they are being diagnosed more frequently thanks to improved imaging. In dogs, bronchogenic carcinoma and adenocarcinoma are most common. Cats can also develop primary lung tumours, though metastatic disease is more frequent.

Metastatic spread to the lungs is extremely common in dogs and cats with other primary cancers such as osteosarcoma, mammary carcinoma, or hemangiosarcoma. Thoracic tumours can be aggressive and often asymptomatic until advanced. Accurate staging and early detection are essential for directing treatment decisions.

Thoracic and respiratory tumours may cause:

• Persistent coughing or coughing up blood.
• Exercise intolerance or shortness of breath.
• Weight loss, lethargy or reduced appetite.
• Chest discomfort or laboured breathing.

Diagnosis typically involves thoracic radiographs, ultrasound and CT scans to identify masses or metastatic nodules. However, these methods may miss small or metabolically active lesions. A biopsy or fine needle aspirate is used to confirm tumour type. PET-CT adds a new dimension by revealing metabolic activity, improving staging accuracy and supporting treatment planning.

PET-CT scans provide metabolic and anatomical detail, making them invaluable for thorax cancers, where treatment decisions often hinge on staging accuracy.

The primary benefits of PET-CT  include:

• Early detection of metastases. The scan identifies small or hidden lung nodules that may not be visible on radiographs or conventional CT.
• Helps distinguish between active tumour tissue and benign changes such as inflammation, infection or scar tissue.
• Ensures that surgery (e.g., lobectomy for a primary lung tumour) is justified by ruling out systemic spread.
• Defines active tumour margins for accurate dose delivery, sparing healthy lung tissue in radiation treatment.
• Tracks metabolic changes after chemotherapy or targeted therapy, often before size changes occur on CT.

Thoracic and respiratory cancers can be particularly challenging because they may remain silent until advanced and treatment options depend heavily on accurate staging. Pet owners often face difficult decisions; clear diagnostic information is essential for planning the best care pathway. 

At PET Theranostics, we provide the most advanced thoracic imaging and diagnostics, offering a whole-body view of disease activity, not just structural change. By integrating PET-CT into respiratory oncology, vets can make more confident surgical recommendations. Contact us today and ask about a referral.