I believe they mean that the random variables have a common support. For example, if X ~ Unif[0,2] and Y ~ Unif[1,3], then their respective PDF's overlap in the interval [1,2], meaning the only interval where both X and Y can have common values is [1,2]. To illustrate, below is a representation of the supports of X and Y, below which is a representation of the real line.
1 Thyroid cancer is a malignant tumor of the thyroid gland. 2  Symptoms of thyroid cancer include swelling in the neck (goiter), neck pain, hoarseness, swallowing and breathing problem, swollen lymph gland in the neck.
Ad. The most common cause of an enlarged neck is a goiter or enlarged thyroid nodules. These are caused by a swelling of the nodules located around the thyroid gland or a swelling of the thyroid itself.n enlarged neck refers to any swelling of the neck itself or of the internal structures within the neck. Lymph nodes, the thyroid gland, and other important systems are found inside the base of the neck along with vocal cords and blood vessels.