Zusammenfassung
Bei zystischen Nierenläsionen handelt es sich meist um einfache oder komplizierte
Zysten, die sowohl solitär als auch im Rahmen von zystischen Nierenerkrankungen auftreten.
Zu einem geringeren Anteil liegen benigne oder maligne zystische Raumforderungen vor.
Die Klassifikation von zystischen Läsionen (Kategorie l - IV) anhand von sonographischen
und computertomographischen Kriterien nach Bosniak ist sehr nützlich für die Charakterisierung
der Läsion und für die Entscheidung über das therapeutische Vorgehen. Das Hauptziel
dabei ist, operative Eingriffe bei Zysten der Kategorie II zu vermeiden und diese
von den Zysten der Kategorie III bzw. IV zu differenzieren, die eine operative Exploration
benötigen. Bei der Abklärung zystischer Nierenläsionen ist die Sonographie die Untersuchungsmodalität
der Wahl, da unter Beachtung der entsprechenden Kriterien der Bosniak-Klassifikation
eine sichere und ökonomisch sinnvolle Diagnose der sehr häufigen einfachen Zyste gestellt
werden kann. Falls der Verdacht auf eine komplizierte Zyste oder einen zystischen
Tumor gestellt wird, sollte eine dreiphasige kontrastverstärkte Spiral-CT der Nieren
erfolgen. Die MRT besitzt gegenüber der CT Vorteile in der Dignitätsbeurteilung komplexer
zystischer Raumforderungen.
Abstract
Cystic renal lesions are most often simple or complicated cysts, which can be seen
solitary or as part of cystic renal diesease. The minority of these lesions are benign
or malignant cystic tumors. The classification of cystic renal masses by Bosniak
(category l - IV) based on specific ultrasound and CT featueres is very useful for
the characterization of the lesion and for the therapeutic decision. The main objective
of this classification is to differentiate nonsurgical (category II) from surgical
cystic masses (category III/IV). Ultrasound is the first modality of choice in the
diagnostic work-up of cystic renal masses, because an accurate and economically reasonable
diagnosis of the frequent simple cyst can be made by maintaining rigid ultrasound
criteria of the Bosniak classification. If a complicated cyst or a cystic tumor is
suspected a threephasic contrast-enhanced CT of the kidneys should be performed. MRI
is superior to CT in the characterization of complex cystic masses.
Key words
Cystic renal lesions CT - MRT - renal cysts renal tumors
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