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Bosniak classification of renal cysts (view source)
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'''Bosniak classification of renal cysts''' is a radiologic classification system for [[kidney]] cysts. | '''Bosniak classification of renal cysts''' is a radiologic classification system for [[kidney]] cysts. It originally consisted of four categories (I, II, III, IV).<ref name=pmid3510019>{{Cite journal | last1 = Bosniak | first1 = MA. | title = The current radiological approach to renal cysts. | journal = Radiology | volume = 158 | issue = 1 | pages = 1-10 | month = Jan | year = 1986 | doi = 10.1148/radiology.158.1.3510019 | PMID = 3510019 }}</ref><ref name=pmid10915671>{{Cite journal | last1 = Curry | first1 = NS. | last2 = Cochran | first2 = ST. | last3 = Bissada | first3 = NK. | title = Cystic renal masses: accurate Bosniak classification requires adequate renal CT. | journal = AJR Am J Roentgenol | volume = 175 | issue = 2 | pages = 339-42 | month = Aug | year = 2000 | doi = 10.2214/ajr.175.2.1750339 | PMID = 10915671 }}</ref> | ||
A subsequent modification turned it into a five category system: | |||
{| class="wikitable sortable" | |||
!Category | |||
!Percent malignant | |||
!Management | |||
!Radiological Characteristics | |||
|- | |||
| Bosniak I | |||
| 0% | |||
| no follow-up necessary | |||
| Simple cyst | |||
|- | |||
| Bosniak II | |||
| 0% | |||
| no follow-up necessary | |||
| Minimally complex (septa <1mm or thin calcification; non-enhancing attenuation due to proteinaceous or haemorrhagic contents) | |||
|- | |||
| Bosniak IIF | |||
| 5% | |||
| follow-up (4 years<ref name=pmid24766033>{{Cite journal | last1 = Hindman | first1 = NM. | last2 = Hecht | first2 = EM. | last3 = Bosniak | first3 = MA. | title = Follow-up for Bosniak category 2F cystic renal lesions. | journal = Radiology | volume = 272 | issue = 3 | pages = 757-66 | month = Sep | year = 2014 | doi = 10.1148/radiol.14122908 | PMID = 24766033 }}</ref>) | |||
| Minimally complex (increased septa, but minimally thicknened/nodular; perceived, but not measurable enhancement) | |||
|- | |||
| Bosniak III | |||
| 50% | |||
| excise to r/o malignancy | |||
| Indeterminate (thick or nodular septa with measurable CT enhancement) | |||
|- | |||
| Bosniak IV | |||
| 100% | |||
| almost certainly malignant | |||
| Clearly malignant (solid mass +/- cystic/necrotic component) | |||
|} | |||
Note: | |||
*The "F" in ''IIF'' have minimally suspicious features and should get '''f'''ollow-up imaging.<ref name=pmid23211292>{{Cite journal | last1 = Ding | first1 = Y. | last2 = Chen | first2 = L. | last3 = Deng | first3 = FM. | last4 = Melamed | first4 = J. | last5 = Fan | first5 = R. | last6 = Bonsib | first6 = S. | last7 = Zhou | first7 = M. | title = Localized cystic disease of the kidney: distinction from cystic neoplasms and hereditary polycystic diseases. | journal = Am J Surg Pathol | volume = 37 | issue = 4 | pages = 506-13 | month = Apr | year = 2013 | doi = 10.1097/PAS.0b013e318271eff9 | PMID = 23211292 }}</ref> | |||
===Schematic=== | |||
*[http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4341374/figure/f01/ A nice drawing of the Bosniak categories (nih.gov)].<ref>{{Cite journal | last1 = Muglia | first1 = VF. | last2 = Westphalen | first2 = AC. | title = Bosniak classification for complex renal cysts: history and critical analysis. | journal = Radiol Bras | volume = 47 | issue = 6 | pages = 368-73 | month = | year = | doi = 10.1590/0100-3984.2013.1797 | PMID = 25741120 }}</ref> | |||
==See also== | ==See also== | ||