A mass in the middle of the neck may look like a simple lump, but in some cases it is the result of a structure that remained in the body during development before birth.
This is called a thyroglossal duct cyst, a congenital abnormality that occurs when the duct through which the thyroid moves during fetal development does not disappear completely. Over time, remnants of this duct can accumulate fluid and form a cyst.
These cysts are usually found in the midline of the neck, between the base of the tongue and the area where the thyroid is located. In some cases, they are small and go completely unnoticed for years.
The problem can become apparent when the cyst grows or becomes infected, causing swelling, pain, and even difficulty swallowing. One striking feature is that the mass may move upward when swallowing or sticking out the tongue.
Medical imaging can locate it and distinguish it from other neck masses. Ultrasound is usually sufficient to evaluate these cysts, although CT scans or MRIs may also be used in certain cases.
Although the vast majority are benign, there is a very small risk of cancer developing inside the cyst. When removal is necessary, the usual treatment is surgery, typically using the Sistrunk procedure, which aims to remove not only the cyst but also the tract left behind by this embryonic structure.
A small mass in the neck may actually be a reminder of a process that began while the body was still forming before birth.