唾液腺
"Salivary gland heterotopia" is where salivary gland acini cells are present in an abnormal location without any duct system. The most common location is the cervical lymph nodes. Other reported sites of heterotopic salivary gland tissue are the middle ear, parathyroid glands, thyroid gland, pituitary gland, cerebellopontine angle, soft tissue medial to sternocleidomastoid, stomach, rectum and vulva. Salivary gland neoplasm occurrence within heterotopic salivary gland tissue is rare.