1 Hindman NM, Hecht EM, Bosniak MA. Follow-up for Bosniak category 2F cystic renal lesions. Radiology. 2014;272:757-66. [ Links ] 2 Smith AD, Allen BC, Sanyal R, et al. Outcomes and complications related to the management of Bosniak cystic renal lesions. AJR Am J Roentgenol. 2015;204:W550-6. [ Links ]

1 Jul 2017 Bosniak IIF cysts, which showed reclassification to the Bosniak III/IV category during radiological followup (12%), showed malignancy in 85%, 

About The Bosniak Classification is used to quantify the risk of malignancy and need for observation or radical treatment based on the findings of computed tomography (CT). The case described is that of a 65-year-old man with renal cystic disease who was initially given a Bosniak stage IIF classification and was subsequently managed with CT surveillance. Oltre a Bosniak 2F, gli altri quattro includono: Bosniak 1, Bosniak 2, Bosniak 3 e Bosniak 4. Il tipo di cisti renali Bosniak 2F ha queste caratteristiche: aumento del numero di setti (spesse pareti delle cisti); ispessimento minimo dei setti; minimamente complesso ma che richiede test di follow-up (ragionevole a circa 6 mesi); la presenza di Bosniak IIF 5% follow-up (4 years) 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 In a study focused on length of follow-up of 156 Bosniak category 2F lesions, Hindman et al. found that no lesion progressed after 3.2 years of follow-up (3.8 years when prospective readings were taken into account).

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Subsequent imaging revealed complete  Titel: Verlaufskontrolle von komplizierten Nierenzysten (Bosniak Typ IIF) / “Follow -up for Bosniak category 2F cystic renal lesions” Autoren: Nicole M. Hindman,  19 Oct 2016 Specificity remains moderate at 74 % (95 % CI 64–82). • Follow-up examinations should be considered in Bosniak. IIF and Bosniak II cysts. 8 Mar 2018 history of Bosniak IIF, III, and IV cysts that were identified on imaging studies done between 2001 and 2013. Median follow-up was 5.5 years.

98% cysts were unchanged in appearance, whilst 66% did not change in size. Four patients (2%) underwent partial nephrectomy secondary to progression in cyst complexity. Conclusion.

3 Jan 2020 However, the optimal interval time for follow-up is unclear and is influenced by cyst complexity. Bosniak had suggested that category IIF cysts 

Hindman NM, Hecht EM, Bosniak MA. Follow-up for Bosniak category 2F cystic renal lesions. Radiology. 2014;272(3):757–66. PubMed Article PubMed Central Google Scholar 39.

type 2F: (the “F” is for follow-up needed) cysts are more complex that simple type II cysts, but do not meet the criteria for a type III classification. These cysts may demonstrate an increased number of septa or minimal smooth thickening of the wall or septa.

Conclusion.

One-hundred-and-twelve out of 364 patients with Bosniak 2F lesions underwent Bosniak 2F lesions were re-assessed during follow-up CEUS scans.
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Finally addressed in February 2018 with a new scan. And again a follow up in September 2018. Radiologist report said in first report 5cm complex renal cyst, thick walled. Next scan, 4.3 cm exophtic complex renal cyst of Bosniak llf.

Conclusion.
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Cancers (2020-08-01) . Contrast-Enhanced Ultrasound (CEUS) for Follow-Up of Bosniak 2F Complex Renal Cystic Lesions—A 12-Year Retrospective Study in a Specialized European Center

2014;272(3):757–766. Mousessian PN, Yamauchi FI, Mussi TC, et al. Malignancy rate, histologic grade, and progression of bosniak category iii and iv complex renal cystic lesions. Am J Roentgenol. 2017;209(6):1285–1290. Bosniak category 2F (''F'' for imaging follow-up), 3, and 4 lesions can have both benign and malignant etiologies, with malignancy rates increasing with increasing category.

Besides Bosniak 2F, the other four include: Bosniak 1, Bosniak 2, Bosniak 3, and Bosniak 4. The Bosniak 2F type of kidney cysts has these characteristics: increased number of septa (thick walls of cysts); minimal thickening of septa; minimally complex but requiring follow-up tests (reasonable at around 6 months); the presence of hyperdense

Finally addressed in February 2018 with a new scan.

Conclusion. Radiological progression of Bosniak 2F cysts is low but may occur up to 24 months after diagnosis. Bosniak 2F lesions should be followed for 3-5 years; if stable or downgraded after that period of time, data would suggest, no further follow-up imaging is necessary. Cite This Abstract Hindman, N, Hecht, E, Bosniak, M, Long Term Follow-up of Bosniak 2F Cystic Renal Lesions. The Bosniak classification system of renal cystic masses divides renal cystic masses into five categories based on imaging characteristics on contrast-enhanced CT. It is helpful in predicting a risk of malignancy and suggesting either follow up o type 2F: (the “F” is for follow-up needed) cysts are more complex that simple type II cysts, but do not meet the criteria for a type III classification. These cysts may demonstrate an increased number of septa or minimal smooth thickening of the wall or septa.