We present the rare case of lipomatous atrial septal hypertrophy associated with adrenocorticotropin hormone therapy in an infant with West syndrome, highlighting their relatively benign nature and good prognosis in children, and the relevance of the differential diagnosis with more dangerous cardiac masses in order to avoid aggressive diagnostic and therapeutic interventions.
Keywords: West syndrome; adrenocorticotropin hormone; cardiac tumour; echocardiography; hypertrophic cardiomyopathy; lipomatous atrial septal hypertrophy.