Introduction
Abdominal cancer is a significant health concern in both dogs and cats, affecting organs such as the liver, spleen, kidneys, gastrointestinal tract, and lymph nodes. Early detection and accurate diagnosis are crucial for determining prognosis and guiding treatment decisions.
One of the most advanced diagnostic tools in veterinary medicine today is computed tomography (CT) scanning. CT provides detailed cross-sectional images of the body, allowing veterinarians to assess the size, location, and extent of tumours more precisely than many traditional imaging techniques.
At AmyLara Veterinary Clinic, pets have direct access to advanced diagnostic pathways, with access to CT scanning when it’s needed. You can also view our wider range of veterinary services.
Types of Abdominal Cancer
Dogs and cats can develop several types of abdominal cancer, each with distinct characteristics and prognoses. Common abdominal cancers include:
1) Hepatic (Liver) Tumours
These include hepatocellular carcinoma and bile duct carcinoma. Liver tumours may present with non-specific symptoms such as weight loss, vomiting, lethargy, or an abdominal mass detectable on palpation.
2) Splenic Tumours
Hemangiosarcoma is the most common malignant splenic tumour in dogs, whereas cats are less frequently affected. Splenic tumours can remain asymptomatic until rupture, causing acute abdominal bleeding, collapse, shock, and sometimes sudden death.
3) Renal (Kidney) Tumours
Kidney tumours are rarer but can include renal cell carcinoma and lymphoma. Symptoms may involve blood in the urine (hematuria), abdominal discomfort, or enlargement of one kidney.
4) Gastrointestinal Tumours
Lymphoma, adenocarcinoma, and leiomyosarcoma can affect the stomach and intestines. Clinical signs may include vomiting, diarrhoea, weight loss, or intestinal obstruction.
5) Mesenteric and Retroperitoneal Masses
Lymphoma and soft tissue sarcomas can arise in abdominal lymph nodes or connective tissues, sometimes compressing other organs and causing vague or intermittent symptoms.
Challenges in Diagnosis
Diagnosing abdominal cancer in pets can be challenging because clinical signs are often vague or absent in early stages. Physical examination may detect some masses, but deeper structures (such as the pancreas, retroperitoneal space, or portions of the small intestine) can be difficult to assess.
Traditional diagnostic methods commonly include:
Abdominal ultrasound: A non-invasive first-line imaging tool that provides real-time visualisation of abdominal organs and can guide fine needle aspirates or biopsies. However, it can be operator-dependent and may miss small or complex lesions.
Radiography (X-rays): Helpful for identifying larger masses or organ enlargement, but less sensitive for small or subtle soft tissue lesions.
Blood tests and biochemistry: Can indicate organ dysfunction or paraneoplastic syndromes, but cannot confirm the presence or type of cancer alone.
The Role of CT Scanning
Computed tomography (CT) has become increasingly important in veterinary oncology due to its ability to produce detailed, three-dimensional images of abdominal organs and surrounding structures. CT scanning offers several advantages over traditional imaging:
1) Enhanced Visualisation of Tumour Extent
CT can differentiate between soft tissues more effectively than ultrasound or radiography. It allows precise measurement of tumour size, evaluation of invasion into adjacent organs, and detection of multiple lesions that may be missed with other modalities.
2) Detection of Metastasis
CT is extremely valuable for staging abdominal cancers because it can reveal spread to lymph nodes, lungs, or other organs. Accurate staging is essential for prognosis and treatment planning.
3) Surgical Planning
CT provides surgeons with a clear “map” of a tumour’s location relative to vital structures, supporting more confident planning of complex surgery while reducing risk to surrounding organs.
4) Guidance for Biopsies
CT-guided biopsies allow accurate sampling of tumours in hard-to-reach locations, improving diagnostic yield and reducing complications in suitable cases.
CT Protocols for Abdominal Imaging
CT scanning in dogs and cats typically requires sedation or general anaesthesia to ensure the patient remains still. Protocols may include:
- Pre-contrast scans: Useful for identifying calcification or haemorrhage within a mass.
- Post-contrast scans: Intravenous contrast enhances blood vessels and helps distinguish tumours from normal tissue.
- Multiplanar reconstructions (MPR): Images can be reformatted into multiple planes (sagittal, coronal, oblique) for improved assessment.
Clinical Applications
CT scanning is particularly valuable in diagnosing and managing specific abdominal cancers:
Hepatic tumours: Helps differentiate primary liver tumours from metastatic disease and assess involvement of major vessels.
Splenic hemangiosarcoma: Can detect splenic masses earlier, assess for metastasis, and support surgical planning.
Renal tumours: Supports evaluation of vascular invasion and planning for procedures such as nephrectomy.
Gastrointestinal and mesenteric tumours: Helps identify small masses, assess bowel wall changes, and evaluate lymph node involvement or obstruction.
Case Example
Consider a middle-aged dog presenting with vague abdominal distension and lethargy. An ultrasound identifies a mass in the liver but cannot determine whether adjacent vessels are involved. A CT scan reveals a large hepatic tumour compressing the portal vein and additional small nodules in the lungs, suggesting metastasis.
This precise staging helps the veterinary team decide against surgery due to a poor prognosis and instead pursue a care plan focused on chemotherapy (where appropriate), pain management, and supportive treatment to protect quality of life.
Conclusion
Abdominal cancers in dogs and cats are challenging to diagnose due to non-specific symptoms and variable tumour locations. While ultrasound and radiography remain essential first-line tools, CT scanning has revolutionised the evaluation and management of abdominal tumours.
CT provides high-resolution, three-dimensional images that allow veterinarians to detect tumours earlier, stage disease more accurately, guide biopsies, and plan surgery with greater confidence. In modern veterinary oncology, CT scanning is an invaluable tool that improves diagnostic precision and supports better outcomes for pets.
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