Tumor cells proliferating around the cyst wall were anaplastic lymphoma kinase (ALK) (+), pan-tropomyosin receptor kinase (−), smooth muscle actin (SMA) (−), transducer-like enhancer of split 1 (−), BCL6 corepressor gene (−), and alpha-internexin (−), using immunohistochemistry. Here, ALK is linked to neoplasm.