Which of the following is NOT a recognized complication of diabetes mellitus?

The classic microvascular and macrovascular complications of diabetes mellitus include: Retinopathy (microvascular — leading cause of blindness in working-age adults), Nephropathy (microvascular — leading cause of end-stage renal disease), Neuropathy (peripheral and autonomic), and Macrovascular disease (coronary artery disease, stroke, peripheral arterial disease). While diabetes significantly increases cardiovascular risk and can affect cardiac function, 'diabetic cardiomyopathy' is not among the classic, established complications listed in standard diabetes classification (the classic triad is Retinopathy, Nephropathy, Neuropathy — the '3 N's plus retinopathy'). Cardiovascular disease is the leading cause of death in diabetics, but it is categorized as macrovascular disease, not a specific 'diabetic cardiomyopathy' per classic teaching.