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BOSNIAK CLASSIFICATION OF RENAL CYSTS

“ 1.   Characteristic simple cyst. No follow-up. 2.   Septated (less than 2 mm thick), thin wall/septal calcification, high-density cyst (60...

1.  Characteristic simple cyst. No follow-up.

2.  Septated (less than 2 mm thick), thin wall/septal calcification, high-density cyst (60-100 HU). No follow-up.
3.  2f. Thickened cyst walls or septate, no contrast enhancement. Thickened/nodular calcification of walls or septae. Most likely benign. Follow-up at 3, 6 and 9 months.
4.  Indeterminate, most surgically excised. Thick, irregular calcification, thick septae with or without enhancement, irregular margins, multilocular mass.
5.  Frankly malignant, necrotic neoplasm arising from cyst wall. Irregular nodules, nodular septation, thick/shaggy walls/septae, solid areas with enhancement.