The Hidden Diagnosis: Renal Aneurysm And AV Fistula Disguised As A Renal Cyst In In A Primigravida Pregnant Woman

Renal aneurysms are rare and uncommon findings with an incidence of 0.01%-0.1% in the general population, usually made incidentally with imaging obtained to evaluate unrelated pathologies.A true Renal artery aneurysm is defined as a dilated segment of renal artery.Arteriovenous fistula is caused by etiologies, including traumatic or iatrogenic injury or arterial dissection and infection/ inflammation.Our case is a young primigravida presented with gastroenteritis symptoms.For which ultrasound was done to exclude acute abdomen pathologies.Incidentally found to have a cyst and hydronephrosis.On follow up a repeat ultrasound was done uncovering a cyst mimicking Right renal aneurysm and arteriovenous fistula.