Wilms Tumour (Nephroblastoma)

Wilms Tumor (Nephroblastoma)

Wilms tumours are a type of kidney cancer that mainly affects children. They develop from cells called nephroblasts and so are also called nephroblastomas.

Kidney cancer in children is rare but Wilms tumour is the most common type. Around 80 children are diagnosed with a Wilms tumour each year in the UK. Most common in children under 5 and very rare in adults.

Wilms tumours usually only affect one kidney (unilateral).

But in fewer than 10 out of every 100 children (less than 10%), it can affect both kidneys (bilateral)


Most Common Symptoms

Most Wilms Tumours are quite large when they are found.

Often bigger than the kidney itself.

Most of them have not spread to other parts of the body.

The most common symptom is a painless swelling of the tummy (abdomen). Parents might notice a lump in the tummy when bathing the baby, or if their child suddenly jumps a nappy size.


For further guidance about Wilms Tumor, speak to your General Practitioner.