Table 2.

Reported cases of collision renal tumours combining two malignant components

Cases [references]	Sex	Age (years)	Symptoms	Tumour 1	Tumour 2	Follow-up period
1- Anani et al. [9]	Male	81	Not available	CRCC	PRCC	Not available
2- Zhang et al. [11]	Female	63	Hematuria	PRCC	CRCC	NED at 20 months
3- Burch-Smith et al. [12]	Female	67	Abdominal pain	CCRCC	CDC	Metastases 5 months post-nephrectomy
4- Elian & Lam [13]	Male	66	Hematuria	PRCC	RMC	Not available
5- Kawano et al. [14]	Female	64	Abdominal pain, fever	CRCC	CDC	Metastases 8 months post-nephrectomy
6- Bartos et al. [15]	Male	70	Not available	CCRCC	PRCC	NED at 36 months
7- Matei et al. [16]	Male	70	Abdominal pain, hematuria	CDC	PRCC	NED at 57 months
8- Cho et al. [17]	Male	24	Accidental finding	CCRCC	CDC	Not available
9- Gong et al. [18]	Male	72	Weight loss, asthenia, anemia	CRCC	CDC	Not available
10- Roehrl et al. [19]	Female	65	Accidental finding	CRCC	PRCC	NED at 4 months
11- Moe et al. [20]	Male	51	Accidental finding	PRCC	CCRCC	Not available
12- Salazar-Mejia et al. [21]	Male	47	Dry cough, weight loss	CCRCC	CDC	NED at 12 months
13- Lamprou et al. [22]	Male	68	Accidental Finding	CCRCC	PRCC	Not available
14- Compérat [23]	Female	67	Accidental finding	CCRCC	PRCC	Not available
Present Case report 1	Male	64	Accidental finding	CCRCC	PRCC	NED at 20 months
Present Case report 3	Female	59	Accidental finding	CCRCC	CDC	NED at 12 months

CRCC chromophobe renal cell carcinoma; PRCC papillary renal cell carcinoma; CDC collecting duct carcinoma; CCRCC clear cell renal cell carcinoma; RMC renal medullary carcinoma; NED no evidence of disease