Imaging findings and differential diagnosis of infradiaphragmatic pulmonary sequestration

Infradiaphragmatic pulmonary sequestration is a rare congenital disorder but it has been reported increasingly in recent years. In clinical practice these lesions must be differentiated from neuroblastoma, which is the most common solid tumour in infants. Presented herein is the case of a newborn who had a left-sided suprarenal mass and typical ultrasound and magnetic resonance imaging (MRI) features leading to the diagnosis of infradiaphragmatic pulmonary sequestration. We compare imaging features and clinical parameters to neuroblastoma, which is the main differential diagnosis of suprarenal masses in newborns and emphasize the importance of depicting anatomical orientation and identifying vascular supply on MR angiography. By doing so, known clinical algorithms can be extended and diagnostic certainty can be increased in favour for conservative management of suprarenal masses in newborns.