title: [Castleman's disease: isolated retroperitoneal mass. Report of a case].
abstract: OBJECTIVE
  To describe a rare case of vascular hyaline variant of Castleman's disease presenting as a solitary mass, with special reference to the radiological findings and differential diagnosis. The literature is briefly reviewed.
  
  
  RESULTS
  A 48-year-old male presented with nonspecific pain in the left flank. Routine analyses were unremarkable. Sonographic and CT studies showed a well-defined, highly vascularized, 3.3 x 3.6 x 4 cm retroperitoneal mass. The risk of hemorrhage made a preoperative biopsy impracticable and the mass was removed surgically. The pathological analysis of the surgical specimen showed a localized retroperitoneal angiofollicular lymphoid hyperplasia (vascular hyaline variant).
  
  
  CONCLUSIONS
  Castleman's disease can rarely present as a solitary retroperitoneal mass, which must be distinguished from primary retroperitoneal masses that are usually malignant. Imaging techniques are not conclusive. Definitive diagnosis is based on the postoperative pathological findings.
authors.affiliation: Servicio de Radiología y Urología, Hospital Santos Reyes, Aranda de Duero, Burgos.
authors.forename: F J
authors.initials: FJ
authors.lastname: González Sánchez
authors.forename: R M
authors.initials: RM
authors.lastname: Landeras Alvaro
authors.forename: M B
authors.initials: MB
authors.lastname: Encinas Gaspar
authors.forename: S
authors.initials: S
authors.lastname: Napal Lecumberri
mesh_terms: D005871:Castleman Disease / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012187:Retroperitoneal Space
vernacular_title: Enfermedad de Castleman: masa única retroperitoneal. A propósito de un caso.