Bosniak cyst - type II
Renal ultrasound for urolithiasis.
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Lower pole cyst with a calcific component, including within the cyst wall.
Bosniak Cyst Type 2
Minimally complex, single thin (< 1mm) septations, thin Ca++; non-enhancing high-attenuation (due to to proteinaceous or hemorrhagic fluid) renal lesions of less than 3 cm are also included in this category; these lesions are generally well marginated.
Work up : nil%
Malignant : ~ 0
Beautiful diagrams of cyst types - http://radiopaedia.org/cases/diagram-bosniak-classification-of-renal-cysts