Fine needle aspiration of the thyroid? Done under local?

Depends. Depends on the physician doing the biopsy. It's a simple procedure. Some physicians use local anesthetic, some use Ethyl Chloride (cold spray), some use nothing at all. Call the physician's office to find out ahead of time how he/she does it so you can anticipate. Good luck.
Depends. For nodules that can be felt, thyroid fna's can easily be done without any anesthetic. Anesthetic injection actually hurts more than a properly performed fna and can cause more bruising and hamper the quality of the specimen. Nodules biopsied under ultrasound often use local as the needle is inserted much longer and is traveling a longer distance because of the transducer.

Related Questions

Is it true that a fine needle aspiration of a thyroid nodule can lead to metastasis if it is cancerous?

Not true. I couldn't find where anything like this has been proven. Careful trained biopsy technique minimizes complications. You should not worry about metastasis from such a procedure, it doesn't happen. You should worry about getting a diagnosis of this nodule, then pursue recommended treatment or surveillance based on results.
No. No, there is no evidence that a needle biopsy of a cancerous lesion would cause them to spread. Needle biopsies are a very common procedure for thyroid and breast nodules, for example.
No way to know. Probably not. This is a very complex issue. Autopsy rate of differentiated thyroid cancer is more than 50% in those over 50 years old. This is a cancer that most of us die with not of. DTC is so indolent is hard to believe it could be spread from an FNA. Furthermore, the only alternative to percutaneous biopsy would be surgical excision. This would be much more risky with so many benign nodules.

A fine needle aspiration (fna) test of my thyroid nodule - (1.8cm) came back with "suspicious for malignancy" (category 5) result here in australia. My?

Suspicious. Thats not a result, the result will be a pathology report from the aspiration describing the sample examined with microscope. Check with your doctor, I hope it turns out well.
Ask a Pathologist. Fine needle aspirations are difficult to interpret since the amount of tissue taken is very small. In your particular case the prase "suspicious for malignancy" is strongly suggestive of cancer by the pathologist. A final veredict would be to get another bigger sample or go for exploratory surgery with the intent to perform the subtotal thyroidectomy as a treatment for the cancer. Ask endocrine.

What is the definition or description of: ultrasound-guided fine needle aspiration?

Gets tissue sample. This technique uses a non invasive ultrasound machine to see where the needle is traveling in the body in order to obtain a sample of tissue. Aspiration usually refers to obtaining fluid from a joint or a mass (cyst) in the body.
Mini Biopsy. The area to be biopsied is visualized with sono. The skin is prepped, the sono probe is covered with a sterile sleeve. Under constant ultrasound guidance, a small bore needle (20g or less) is advanced to the lesion and multiple passes made, usually with the needle hooked up to a syringe with suction applied. Aspirated material is placed in formalin or smeared onto slides to pathology for disgnosis.
Obtain cell samples. A fine needle (25G or 27G size) is inserted into the area of concern, after applying local anesthesia, under continuous real-time ultrasound scanning. Once inside the region of interest, suction is applied while the needle is moved back and forth several times. The needle is then removed and its content spread on a glass slide, which is then "fixed" and "stained' for interpretation.

What is the definition or description of: ct-guided fine needle aspiration?

Minimally invasive. A ct guided fine needle biopsy is performed by an interventional radiologist and in ideal situation will have a cytopathologist evaluating the samples at the bed side. The ct is used to guide the needle to the target to acquire a sample. It is usually done with local but sedation can be used. In the right hands it is a very high yield test. Ask your team what their success rate is!