Botryoid growth pattern (BGP) is a polypoid mass growing into the renal pelvis, rarely seen in bilateral Wilms tumors where it represents a surgical challenge. We report our experience of nephron sparing surgery in 3 patients with BGP in bilateral Wilms tumor. Surgical en bloc removal was performed after calyx opening with no complications. The histology of the BGP was Intralobar Nephrogenic Rest in all cases while all Wilms tumors were of intermediate risk. One patient early recurred. At a follow-up of 9 months, 22 and 23 years, all patients were alive with a moderate renal insufficiency and hypertension.

中文翻译：

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具有葡萄状生长模式的双侧肾母细胞瘤的肾单位保留手术。

葡萄状生长模式 (BGP) 是一种长入肾盂的息肉状肿块，在双侧 Wilms 肿瘤中很少见，这代表了手术挑战。我们报告了 3 例双侧肾母细胞瘤 BGP 患者的肾单位保留手术经验。花萼打开后进行了整块手术切除，没有出现并发症。BGP 的组织学在所有情况下均为叶内肾源性休息，而所有 Wilms 肿瘤均具有中等风险。1例早期复发。在 9 个月、22 年和 23 年的随访中，所有患者均存活并伴有中度肾功能不全和高血压。