Adenolipoma of the Skin Arising at Neck Region
A 56-year-old man was admitted to our hospital because of an anterior neck mass. It had been slowly growing over several years. The patient had no other specific history, including familial history, and had good general status. On the physical examination, an approximately 4.0 cm movable, non-painful, and soft mass on the anterior neck was observed. A neck computerized tomography showed a small fatty mass at the subcutaneous tissue of the anterior neck. An excisional biopsy was performed. On gross examination, the tumor was soft, tan-yellow, and lobulated (). Microscopically, it showed many lobules of mature adipose tissue with fine fibrous septa. A few clusters of eccrine units were entrapped in the adipose tissue (). At times, the eccrine ducts showed partly cystic dilatation. The adipocytes and eccrine glands had no cytologic atypia, necrosis, or mitosis. Periodic acid-Schiff (PAS) stain was positive in the secretory granules and intraluminal secretions of the eccrine glands (). On immunohistochemistry, the myoepithelial cells surrounding the eccrine glands were positive for smooth muscle actin ().\nA complete excision was performed. The patient was well and without recurrence, for one year after surgery.