title: Poroid hidradenoma. Report of a case with cytologic findings on fine needle aspiration.
abstract: BACKGROUND
  Fine needle aspiration cytology (FNAC) can be used for establishing a diagnosis of cutaneous lesions, especially in cases with cyst formation. Poroid hidradenoma is eccrine neoplasm with both solid and cystic components.
  
  
  METHODS
  A 77-year-old female presented with a slightly elevated nodule in the skin on her left elbow. The tumor was well demarcated, 2.7 x 2.4 cm and soft, and overlying skin was slightly reddish. FNAC revealed two types of cell: one had abundant cytoplasm in which small to large, occasionally multinucleated nuclei with small but distinct nucleoli were evident. Chromatin was finely granular, and nuclear membrane was thin and almost smooth. Another type of cell had scanty cytoplasm and a round to oval nucleus with small but prominent nucleoli. Histologic diagnosis was poroid hidradenoma.
  
  
  CONCLUSIONS
  FNAC can be useful for diagnosing intradermal cystic lesions before surgical resection.
authors.affiliation: Department of Pathology, Sakai Municipal Hospital, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Hoshida
authors.forename: J
authors.initials: J
authors.lastname: Hanai
authors.forename: N
authors.initials: N
authors.lastname: Matsushita
authors.forename: M
authors.initials: M
authors.lastname: Yonekawa
authors.forename: Y
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: H
authors.initials: H
authors.lastname: Kawakami
authors.forename: N
authors.initials: N
authors.lastname: Uchino
authors.forename: K
authors.initials: K
authors.lastname: Aozasa
mesh_terms: D006607:Adenoma, Sweat Gland / Q000473:pathology* / Q000648:ultrastructure; D000368:Aged; D001707:Biopsy, Needle; D004550:Elbow; D005260:Female; D006801:Humans; D013544:Sweat Gland Neoplasms / Q000473:pathology* / Q000648:ultrastructure