title: Organized hematoma mimicking retroperitoneal cystic tumors.
abstract: BACKGROUND
  Isolated retroperitoneal cysts are uncommon with an estimated incidence of 1/5750-1/250,000. In women they occur about 1.5-2 times more often than in men. The largest numbers of patients are young or middle aged (20-50 years). Lack of knowledge about the causes of these rare entities and asymptomatic clinical picture often leads to diagnostic and tactical mistakes.
  
  
  METHODS
  The medical history of 54-year old male patient B., who has been hospitalized at Surgical Department №1 of Danylo Halytsky Lviv National Medical University (Surgical Department of Lviv Regional Clinical Hospital), was processed retrospectively.
  
  
  RESULTS
  Diagnosing of retroperitoneal organized hematoma in the early stages is not always possible, because exploration of retroperitoneal space can be difficult. General tests and tumor markers are usually normal range and not prognostically informative in this case. Decisively important were imaging diagnostic methods-USG and CT. As clinical cases of organized hematoma are quite rare, finding out retroperitoneal formation with irregular contours and infiltrative component indicates for retroperitoneal tumors. Thus, this formation accumulated contrast that says for increased vascularization. Intraoperative: formation with thick walls and heterogeneous structure. Histological diagnosis: hematoma in a phase of deep organization. On our opinion, taking into account location and structure of tumors, laparoscopic intervention was not appropriate, open surgery was reasonable approach. Preoperative biopsy has a crucial role to set preliminary diagnosis.
  
  
  CONCLUSIONS
  Despite the fact that organized retroperitoneal hematomas are quite rare, their diagnosis requires detailed examination and histological verification.
authors.affiliation: Surgery №1 Department, Danylo Halytsky Lviv National Medical University, Nekrasova, Street 4, Lviv, Ukraine 79010, Ukraine. Electronic address: ivankiv_taras@bigmir.net.
authors.forename: Taras
authors.initials: T
authors.lastname: Ivankiv
authors.affiliation: Surgery №1 Department, Danylo Halytsky Lviv National Medical University, Nekrasova, Street 4, Lviv, Ukraine 79010, Ukraine. Electronic address: o.ogurtsov@gmail.com.
authors.forename: Oleksii
authors.initials: O
authors.lastname: Ogurtsov
authors.affiliation: Surgery №1 Department, Danylo Halytsky Lviv National Medical University, Nekrasova, Street 4, Lviv, Ukraine 79010, Ukraine. Electronic address: halia1309@gmail.com.
authors.forename: Galina
authors.initials: G
authors.lastname: Pokhylevych
keywords: Cystic tumors; Organized hematoma; Retroperitoneal space