What could be the cause of movable lump at base neck shoulder area in child?

A movable lump at the base of the neck and shoulder area in a child could have various causes. Some possible reasons include:

1. Swollen Lymph Nodes: Lymph nodes are small, bean-shaped structures that play a role in the body's immune system. They can swell when the body is fighting an infection or due to an inflammatory response. If the lymph nodes in the neck and shoulder area become swollen, they may be felt as movable lumps.

2. Lipoma: A lipoma is a benign fatty tumor that can grow anywhere in the body, including the neck and shoulder area. Lipomas are usually soft, movable, and painless. They are not harmful and typically don't require treatment unless they cause discomfort or affect appearance.

3. Thyroglossal Duct Cyst: A thyroglossal duct cyst is a fluid-filled sac that can form along the path of the thyroglossal duct, which is the embryonic structure from which the thyroid gland develops. These cysts are usually located in the midline of the neck, but can sometimes be found to one side, such as near the base of the neck and shoulder area.

4. Branchial Cleft Cyst: A branchial cleft cyst is another type of congenital cyst that can occur in the neck and shoulder area. It arises from remnants of the embryonic branchial clefts, which are structures present during fetal development that contribute to the formation of the neck.

5. Hemangioma: A hemangioma is a benign vascular tumor that can occur in different parts of the body, including the neck and shoulder area. Hemangiomas are usually red or purple in color, and they may feel soft and spongy to the touch. They often grow rapidly during infancy but tend to resolve spontaneously over time.

6. Dermoid Cyst: A dermoid cyst is a rare type of congenital cyst that can contain skin, hair follicles, and other tissues. Dermoid cysts can occur in various locations, including the neck and shoulder area.

If a child has a movable lump at the base of the neck and shoulder area, it's important to have it evaluated by a healthcare professional to determine the exact cause and receive appropriate treatment or monitoring if necessary. The doctor may perform a physical examination, order imaging tests like ultrasound or CT scans, or recommend further evaluation to make a diagnosis.