Ultrasound first for an uncertain superficial neck lump
An ultrasound scan is usually the first imaging test for an uncertain superficial neck lump that has no concerning features.
Remember
Start with an ultrasound scan for an uncertain superficial neck lump with no concerning features. Needle sampling and CT or MRI come afterwards, and only if the scan or the clinical picture calls for them.
Memory aid
ultrasound first, needle second, big scans third
It gives the usual order of tests for this lump: the scan first, then a needle sample if the scan looks suspicious, then CT or MRI if more imaging is required.
When a superficial neck lump has no concerning features but its origin is still uncertain, the usual first test is an ultrasound scan. It uses sound waves, so unlike CT it involves no ionising radiation (the high-energy radiation used in X-rays and CT scans).
The scan is quick, and it shows the position, size, shape and blood flow of the lump. It also shows whether the lump is cystic (mainly fluid-filled) or solid, and it helps identify the structure that the lump comes from, such as a lymph node or the thyroid.
The scan findings decide what happens next. If the lump looks suspicious, an ultrasound-guided fine needle aspiration is usually the next step: a thin needle, steered by ultrasound, draws off cells to be examined under the microscope. CT or MRI may be offered if more imaging is required, especially if surgery may be needed.
PET (a scan that uses a radioactive tracer taken up by active cells) and excisional biopsy (surgically removing the whole lump so that it can be examined under a microscope) are not routine first investigations. They are selected, later tests.
A reassuring scan does not replace follow-up. A lump that persists, or that develops red flags such as being present for more than 6 weeks, hard and irregular, fixed to the surrounding tissue or growing rapidly, needs further assessment.
Key facts
- First test
- when a superficial neck lump is uncertain and has no red flag features, the usual first investigation is an ultrasound scan of the neck.
- Why it goes first
- it uses sound waves, so it involves no ionising radiation, and it shows whether the lump is cystic or solid.
- Next step
- an ultrasound-guided fine needle aspiration is usually indicated if the lump looks suspicious on the scan.
- Further imaging
- CT or MRI may be offered if further imaging is required, especially if surgical management may be needed.
- Red flags
- a lump present for more than 6 weeks, hard and irregular, fixed to surrounding tissue or rapidly growing, plus others such as fatigue, weight loss, night sweats, hoarseness or difficulty swallowing.
- Later tests
- PET and excisional biopsy are not routine first investigations.
Exam traps
- A CT scan with contrast (an injected dye) is not the first test for a superficial lump with no concerning features, because it involves ionising radiation and is usually kept for when ultrasound or the clinical picture shows that more detail is needed.
- Fine needle aspiration without imaging first is not the right start for a lump, because ultrasound shows whether the lump is solid or cystic and which part to sample.
- A plain radiograph (an ordinary X-ray) gives much less information about a lump than ultrasound, and it cannot reliably tell a fluid-filled cyst from a solid lump.
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