The concept of a “leave-nothing-behind” strategy has emerged as one of the most intriguing developments in contemporary percutaneous coronary intervention (PCI). Owing to the success of drug-coated balloons (DCBs) in in-stent restenosis and their growing application in selected de novo lesions, interventional cardiologists have increasingly questioned whether permanent metallic implants are always necessary to achieve durable clinical outcomes [1–8]. Currently, few anatomical subsets remain as firmly associated with stent implantation as the left main coronary artery, particularly when accompanied by severe calcification and complex bifurcation disease [9–12]. In this issue, the authors present a remarkable case that challenges this long-standing paradigm by demonstrating a successful stentless strategy for a severely calcified distal left main bifurcation lesion, achieved through staged lesion preparation, advanced calcium modification, intracoronary imaging, and physiology-guided decision-making.
Historically, the rationale for stenting left main lesions has been compelling. The large myocardial territory supplied by the left main coronary artery and, therefore, the potentially catastrophic consequences of acute vessel occlusion have made durable metal scaffolding a cornerstone of treatment. Over the past two decades, major randomized trials comparing PCI and coronary artery bypass grafting have focused largely on optimizing stent-based revascularization rather than eliminating stents [9, 11, 12]. Advances in drug-eluting stent (DES) technology, intracoronary imaging, and procedural techniques have substantially improved outcomes and increased the use of PCI as a treatment option for selected left main lesions [9–11, 13]. As a result, the contemporary interventional mindset has centered on how best to implant a stent rather than whether a stent can be avoided.
The present case is therefore worth discussion because it illustrates a fundamentally different philosophy of coronary intervention. Operators achieved satisfactory vessel expansion without implanting a permanent device, mainly by modifying the underlying plaque and calcium burden. Such an approach aligns with the evolving concept that lesion preparation, rather than stent deployment itself, is a crucial determinant of procedural success in complex coronary intervention [14–17]. A particularly notable aspect of this report is the severity of calcification encountered. Extensive calcium remains one of the greatest challenges in PCI because it limits balloon expansion, promotes stent underexpansion, increases procedural complications, and adversely affects long-term outcomes [14, 15]. In heavily calcified left main disease, these concerns are particularly important. The authors used intracoronary imaging and found near-circumferential calcium with a minimal lumen area of 2.9 mm2. This pattern of lesion morphology significantly increases the risk of suboptimal stent expansion and provides the rationale for subsequent calcium modification before DES or DCB use [14–16]. Finally, operators had to use two advanced methods for calcified lesion preparation: rotational atherectomy for superficial calcification and intravascular lithotripsy for deep calcification. The case demonstrates how complementary calcium-modification technologies can be sequentially applied to target different layers of calcified plaque and progressively improve vessel compliance [14–16].
This observation highlights an important trend in modern interventional cardiology. Understanding plaque morphology, especially calcification, followed by the use of specific methods to optimally prepare the lesion, appears crucial. Angiography alone provides an incomplete understanding of lesion complexity and procedural success. Therefore, the use of intravascular imaging and physiological assessment throughout PCI planning and optimization facilitates the procedure and may improve outcomes, particularly in complex and left main PCI [13, 17, 18]. In the present case, intravascular ultrasound (IVUS) identified both the extent of calcification and the mechanism of recurrent ischemia, while physiological measurements objectively documented the functional significance of residual disease. The subsequent ischemia-free myocardial perfusion imaging at long-term follow-up further confirmed that anatomical success was accompanied by a meaningful physiological benefit.
The development of atherectomy devices, cutting and scoring balloons, specialty non-compliant balloons, and intravascular lithotripsy has transformed the treatment of calcified coronary artery disease [14–16]. In this context, the success of the present case may be considered less as a triumph of DCB therapy alone and more as a result of advanced calcium modification techniques integrated into a planned procedural strategy. DCB may represent the final therapeutic step, but its effectiveness depends closely on the quality of lesion preparation that precedes it [1, 2, 5]. At the same time, caution is warranted before extrapolating this experience to broader clinical practice. As with all case reports, the findings reflect a highly selected patient treated by operators with expertise in advanced coronary intervention. The strategy required multiple procedures, intracoronary imaging, physiological assessment, hemodynamic support considerations, and access to a full range of plaque-modification technologies. While the final result was excellent, it is essential to acknowledge the cumulative procedural burden involved. For many patients, a single imaging-guided DES implantation may offer a simpler, more predictable option [9, 10, 12, 13]. Furthermore, long-term durability beyond the reported follow-up period remains uncertain. Although freedom from ischemia at 14 months is encouraging, larger studies will be necessary to determine whether stentless treatment can consistently provide outcomes comparable to contemporary left main stenting strategies.
Another important question concerns patient selection. It is improbable that all calcified left main lesions are suitable candidates for a leave-nothing-behind approach. Identifying anatomical and physiological characteristics that predict success will be critical if this strategy is to evolve beyond isolated reports. Intracoronary imaging is likely to play a fundamental role in this process, helping operators characterize plaque morphology, choose the lesion preparation strategy, and assess the effectiveness of plaque modification [13–17]. Future studies may reveal that the optimal treatment of left main disease is not a binary choice between stenting and non-stenting but rather a spectrum of approaches tailored to plaque morphology, vessel architecture, and patient-specific considerations.
Despite the discussed uncertainties, the presented case is valuable because it improves our understanding of what is technically achievable in modern PCI. The authors demonstrate that even one of the most challenging lesion subsets in coronary intervention can, under carefully selected circumstances, be treated successfully without permanent metallic scaffold implantation. Even more importantly, this case highlights the increasing importance of lesion preparation, imaging, and physiological assessment as key components of the management strategy. As calcium-modification technologies advance and DCB evidence continues to evolve, the boundaries between conventional PCI with stents and fully implantless coronary intervention may become increasingly blurred [1–3]. The left main coronary artery has long been considered the frontier of leave-nothing-behind treatment strategies. This report does not establish a new standard of care, nor does it suggest that stents should be abandoned for complex left main disease. Rather, it provides compelling proof of concept that encourages further research. The future of coronary interventions may ultimately depend less on the devices we leave behind and more on how effectively we prepare the vessel before deciding whether to implant a device.
