title: A very unusual thyroid tumor: a nodule with mature fat papillary hyperplasia and focal atypia.
abstract: Fat-containing lesions of the thyroid are rare, encompassing several clinical-pathological conditions such adenolipomas, thyrolipomatosis and lipomotous tissue in case of amyloidosis. Furthermore, cases of papillary thyroid carcinoma have been identified in association with thyrolipomatosis. We report a case of 51 years old man referred to surgery for a multinodular goiter, showing multiple cystic and hemorrhagic nodules of up to 3 cm. One of these lesions showed features of papillary hyperplasia with focal cytological atypia and mature fat. Here, we describe and discuss the histological and immunophenotypical features of this rare lesion.
authors.affiliation: Institute for Pathology, Augsburg Clinic , Augsburg, Germany.
authors.forename: Claudio
authors.initials: C
authors.lastname: Cacchi
authors.forename: Hans
authors.initials: H
authors.lastname: M Arnholdt
authors.forename: Armando
authors.initials: A
authors.lastname: Bartolazzi
keywords: hyperplasia; mature fat; papillary features; thyroid