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Table 4 Criteria perceived as being triggers for intervention

From: Management of complex renal cysts in Canada: results of a survey study

 Criterion reported as being a trigger for intervention
N (%)
CharacteristicsBosniak IIIBosniak IV
Progression on imaging from Bosniak III to IV110 (79.1)N/A
Growth rate of solid component above threshold (for example: > 0.5 cm/year)N/A85 (61.2)
Growth of solid component above threshold (for example: > 3 cm)N/A88 (63.3)
Growth rate of cysts above threshold (for example: > 0.5 cm/year)48 (34.5)28 (20.1)
Doubling time of calculated volume ≤ 12 months39 (28.1)39 (28.1)
Progression in the number of septa or calcifications29 (20.9)28 (20.1)
Progression in the thickness of septa or calcifications60 (43.2)43 (30.9)
Worsening or change in the wall or septa enhancement70 (50.4)N/A
Progression or development of cyst wall nodularity94 (67.6)N/A
None of the above2 (1.4)3 (2.2)
I do not offer active surveillance1 (0.7)25 (18.0)