title: A diagnostic pitfall of fine needle aspiration cytology in testicular papillary serous cyst adenoma: a case report.
abstract: BACKGROUND
  Testicular neoplasmns resembling ovarian serous tumors are rarely reported. We describe the first fine needle aspiration biopsy (FNAB) finding of this type of tumor.
  
  
  METHODS
  A 35-year-old man presented with an enlarged right testis. Based on clinical observation, we hypothesized that it was a malignant tumor. FNA cytology findings revealed numerous papillary clusters, glandular-like structures and many isolated round cells. Metastatic papillary adenocarcinoma was suspected based on FNAB cytology. A right radical orchiectomy was performed, and histologic tissue examination was used to diagnose the tumor as a benign papillary serous cystadenoma.
  
  
  CONCLUSIONS
  Papillary serous cystadenoma of the testis is a rare tumor. The cytologic findings of this tumor are confusing and difficult to diagnose. Clusters of epithelial cells with a high nuclear to cytoplasm ratio are mistaken for features of a malignant tumor.
authors.affiliation: Department of Pathology, Cancer Research Institute, Shiraz Medical School, Shiraz, Iran. kumarv@sums.ac.ir
authors.forename: Perikala V
authors.initials: PV
authors.lastname: Kumar
authors.forename: Mehdi
authors.initials: M
authors.lastname: Shirazi
authors.forename: Mahmood
authors.initials: M
authors.lastname: Salehi
mesh_terms: D000328:Adult; D044963:Biopsy, Fine-Needle; D018292:Cystadenoma, Papillary / Q000473:pathology*; D018293:Cystadenoma, Serous / Q000473:pathology*; D003951:Diagnostic Errors; D006801:Humans; D008297:Male; D013736:Testicular Neoplasms / Q000473:pathology*