title: [Characteristics of renal occupying lesions in contrast-enhanced ultrasonography].
abstract: OBJECTIVE
  To determine the value of contrast-enhanced ultrasonography (CEUS) in the diagnosis of renal occupying lesions.
  
  
  METHODS
  Seventy-eight patients with a preliminary diagnosis of renal masses in West China Hospital, Sichuan University were examined by CEUS. The characteristics of enhancement, phase of enhancement/decline, pseudocapsule sign, and time-intensity curve (TIC) were compared between the malignant and benign lesions.
  
  
  RESULTS
  Of the 78 renal occupying lesions, 50 were malignant and 28 were benign. Malignant lesions showed enhanced signs to various degrees. The renal clear cell carcinoma mainly presented as "fast wash-in and fast wash-out", while the other malignant lesions presented as " slow wash-in and fast wash-out" Pseudocapsule signs were found mostly in renal clear cell carcinoma. No enhancement was found in renal cyst. Renal angiomyolipoma presented as diffuse hypo-enhancement characterized with "slow wash-in and slow wash-out". The time-to-peak (TTP) in malignant lesions appeared earlier than benign lesions. Higher levels of peak intensity (PI) and area under the curve (AUC) were found in malignant lesions compared with the benign lesions (P<0. 05).
  
  
  CONCLUSIONS
  CEUS plus time-intensity curve can provide evidence for identifying different kinds of renal occupying lesions.
authors.affiliation: Department of Emergency,  West China Hospital, Sichuan University, Chengdu, China.
authors.forename: Shu
authors.initials: S
authors.lastname: Zhang
authors.forename: Ling
authors.initials: L
authors.lastname: Lin
authors.forename: Jin-hong
authors.initials: JH
authors.lastname: Li
authors.forename: Li
authors.initials: L
authors.lastname: Qiu
authors.forename: Ping
authors.initials: P
authors.lastname: Han
mesh_terms: D019540:Area Under Curve; D002292:Carcinoma, Renal Cell / Q000000981:diagnostic imaging; D003287:Contrast Media; D003937:Diagnosis, Differential; D006801:Humans; D007674:Kidney Diseases / Q000000981:diagnostic imaging*; D007680:Kidney Neoplasms / Q000000981:diagnostic imaging; D014463:Ultrasonography
chemical_list: D003287:Contrast Media