Kidney cyst classification method

The classification method of renal cyst is Bosniak classification. It is mainly based on the density of cyst fluid, whether there is separation, calcification, and whether there is enhancement on the cyst wall. If the cyst fluid is clear, no separation, no obvious calcification, no enhancement, Bosniak grade 1. If there is separation, the cyst fluid is clear, no calcification, no obvious new organisms on the cyst wall, Bosniak grade 2. If there are typical septations, calcification inside, thickening of the cyst wall, and suspicion of new organisms in the cyst wall, it may be Bosniak III. If there are obvious calcification, enhancement of the cyst wall, and septations, it is Bosniak IV.