DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Thyroid cyst in a 53 year old woman. A cyst is a fluid-filled sac. Cysts are harmless but if it is putting pressure on the voice box or causing difficulty with swallowing it will need to be surgically drained. The thyroid is an endocrine gland in the neck.
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