A parathyroid nodule is a growth that develops on one or more of the parathyroid glands. These glands, typically four in number and about the size of a pea, are located near the thyroid gland at the base of the neck. Their primary function is to produce parathyroid hormone (PTH), which is crucial for regulating calcium levels in the blood. According to the reference, "Parathyroid nodules and tumors are growths that develop on the parathyroid glands, which are four pea-sized glands located around the thyroid at the base of the throat. These glands produce parathyroid hormone (PTH) which controls your blood calcium levels. Sometimes, small nodules or tumors can develop in this area."
In simpler terms, a parathyroid nodule is like a small lump or growth on one of the parathyroid glands. These growths can sometimes disrupt the normal function of the gland, potentially leading to imbalances in calcium levels.
