Current UK interpretation of EASA rules is here..
Genitourinary Guidance Material | Medical | Personal Licences and Training
relevant extract reads..
Polycystic renal disease
The diagnosis of autosomal dominant polycystic kidney disease requires an OML for class 1 certificate holders. Berry aneurysms need to be excluded by means of Magnetic Resonance Angiography and cardiac valve disease (including aortic root dilatation) by means of an echocardiogram. Abdominal aortic aneurysm also needs to be excluded.