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Question:

Can ultrasounds miss large tumors?

I really need some advice and maybe a bit of reassurance. I’m feeling pretty overwhelmed right now. My sweet 10-year-old Golden Retriever, Max, recently went through an ultrasound because he’s been acting a bit off and losing some weight. The vet didn’t find anything major, but they mentioned some slight changes in his liver that they wanted to monitor. Today, though, I was petting him and noticed a bulging area around his abdomen that I didn’t remember feeling before. I’m terrified that it might be something serious like a large tumor, and I'm worried that the ultrasound might have missed it. Has anyone else had something similar happen, where an ultrasound didn’t catch everything? Would love to hear any experiences or advice on what I should do next. I just want to make sure I'm doing everything I can for Max. Thanks so much in advance.

Answer:

Hello there! I understand you're worried about whether ultrasounds can miss large tumors. Let's explore this together.

Ultrasounds are a valuable tool in veterinary diagnostics, providing real-time images of your pet's internal organs. However, it's not flawless. Factors like the location of the tumor, the presence of gas or fluid, or even the operator's experience can impact the clarity of the image. Although large tumors are typically visible, certain conditions or positions can obscure them.

For at-home guidance, observe your pet for changes like unexpected weight loss, eating or drinking difficulties, changes in bathroom habits, or unusual lumps you can feel under their skin. These could be signs that something isn’t quite right.

If you notice any such symptoms, it’s essential to consult a veterinarian. More comprehensive diagnostic tests, such as a CT scan or an MRI, might be necessary to get a complete picture of your pet's health.

Always trust your instincts as a pet parent! If you're uneasy or have further questions, booking a video consult with one of our vets at Dial A Vet can provide you with peace of mind and clarity on the next steps.

Answered by

Louise - Senior Veterinary Nurse, Dial A Vet

June 17, 2025

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The "Ask a Vet" forum on Dial A Vet offers general information and helpful tips on pet health, but it's not a substitute for professional veterinary care. The advice here doesn't create a veterinarian-client-patient relationship, and our vets can't diagnose or treat your pet remotely. For emergencies or specific medical concerns, always contact your local veterinarian immediately. Your pet's health is unique, and decisions should only be made after consulting with a qualified professional. By using this forum, you acknowledge these limitations and agree to seek in-person veterinary advice for all your pet's health needs. View our content guidelines.
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