Margin Control and Extended Resection in ACC

Localized Disease Management

Complete surgical resection is the main potentially curative treatment for localized adrenocortical carcinoma (ACC), and margin control is a central component of surgical oncology in this setting.¹² In ACC, margin control generally refers to removal of the tumor intact without rupture and with microscopically negative margins (R0), whereas extended resection refers to en bloc removal of adjacent organs, vascular structures, or nodal tissue when direct extension or regional spread is suspected.² These issues arise within the management of localized and regionally advanced ACC, where the operative aim is oncologic clearance rather than standard adrenalectomy alone.¹²

ACC frequently presents as a large adrenal malignancy with difficult retroperitoneal anatomy, and local extension, nodal involvement, or proximity to major vessels may complicate complete excision.¹² Across retrospective datasets, negative margins are consistently associated with better outcomes, but this association does not establish that broader surgery is intrinsically beneficial in every patient, because extent of resection is closely linked to stage, invasion pattern, and surgeon selection.¹² The available evidence therefore supports general oncologic principles more strongly than it defines a uniform standard extent of resection.

The literature is limited by the rarity of ACC and by heavy reliance on retrospective registries, institutional series, and technical reports rather than prospective comparative trials.³⁴⁵ As a result, estimates of benefit for multivisceral resection, lymphadenectomy, or specific operative approaches are vulnerable to selection bias, confounding by tumor biology, and variation in surgical expertise.³⁴² In practice, the most reliable conclusion is that complete, intact resection matters; the less certain question is how often additional organs or nodal basins should be removed beyond what is necessary to achieve that goal.

Diagnostic and Surgical Context

The operative plan for suspected ACC is shaped by the need to remove the tumor in continuity with any grossly involved adjacent structures while avoiding capsule violation or tumor spillage.¹² This distinguishes ACC surgery from routine adrenalectomy for smaller or apparently benign adrenal lesions, because incomplete excision or tumor rupture may compromise local control and long-term outcomes.²

Retrospective data reliably support the importance of complete resection, but they are less reliable for separating technical quality from underlying disease severity.¹ The practical implication is that preoperative and intraoperative planning usually emphasize exposure, vascular control, and readiness for en bloc resection when invasion is suspected, rather than routine escalation of surgery in all localized tumors.²

Margin Status and Extended Resection

Margin positivity is more common in anatomically advanced ACC, including tumors with extra-adrenal extension, nodal disease, and other adverse features.¹ This suggests that positive margins are partly a marker of aggressive biology and operative difficulty, not solely a marker of surgical decision-making. Even so, margin status remains one of the most consistent prognostic variables after resection, and achieving R0 resection remains a core surgical objective.¹²

Extended resection is therefore principally used to make complete excision possible when adjacent organ involvement is present or strongly suspected. National retrospective data have not shown that multiorgan resection, by itself, confers a clear overall survival benefit after adjustment for disease factors.² What appears reliable is the principle that grossly involved tissue should be removed en bloc when feasible; what remains uncertain is whether routinely broader resection improves outcomes in otherwise localized disease without demonstrated invasion.² Clinically, this supports selective rather than automatic multivisceral resection.

This margin-centered framework also informs how surgeons approach regional nodes, where the biologic importance of nodal disease is clearer than the therapeutic value of node removal.

Lymphadenectomy and Regional Nodal Assessment

Lymphadenectomy is inconsistently performed in ACC, and retrospective population-based studies have not demonstrated a clear independent survival benefit from routine nodal dissection.³⁴² These findings should be interpreted cautiously because nodal surgery is more often undertaken in patients with higher-risk or more locally advanced tumors, making causal inference difficult.

Although a therapeutic effect is uncertain, nodal assessment may still contribute to staging, prognostication, and greater standardization of oncologic surgery.³ Nodal metastases appear more common in higher T-stage disease, which supports a lower threshold for nodal evaluation when imaging, intraoperative findings, or local extent raises concern for regional spread.⁴ The reliable conclusion is that nodal involvement is clinically meaningful; the less reliable conclusion is that removing more nodes necessarily improves survival. In practice, this favors selective nodal assessment in higher-risk localized or regional disease rather than routine lymphadenectomy in every resectable ACC.

Anatomic Patterns and Mapping

Retrospective mapping data suggest laterality-specific nodal drainage patterns, with right-sided tumors more often involving paracaval basins and left-sided tumors involving para-aortic and left renal-hilar basins.⁵ These observations may help focus regional assessment, especially when suspicious nodes are identified, but they do not establish a universally accepted ACC lymphadenectomy template.⁵

Near-infrared lymphatic mapping with indocyanine green has also been described as a feasible intraoperative adjunct for identifying regional drainage pathways in ACC or suspected locoregional recurrence.⁶ The current evidence is limited to feasibility and technical experience rather than improved staging accuracy or survival.⁶ Clinically, mapping may assist selected expert centers, but it remains investigational rather than standard care.

Operative Approach and Oncologic Priorities

The choice of operative approach is closely linked to anticipated margin control and the need for en bloc resection. Retrospective analyses suggest that margin status may not differ markedly by open versus minimally invasive approach in selected cases overall, but the importance of approach increases as tumors become more locally advanced.¹ In particular, laparoscopic resection has been associated with worse survival in stage III disease, supporting an open approach when invasion, nodal disease, or difficult margin clearance is anticipated.²

The most reliable principle is that advanced localized ACC often requires an approach that allows wide exposure and controlled dissection. Less reliable is any claim of broad oncologic equivalence between minimally invasive and open surgery across all presentations, because retrospective comparisons are strongly shaped by case selection.¹² In practical terms, the operative approach is judged mainly by whether it permits intact, margin-conscious tumor removal without rupture.

Morbidity, Tradeoffs, and Role in Management

Extended resection and lymphadenectomy may increase operative complexity and perioperative morbidity even when oncologically justified. This is especially relevant when en bloc clearance requires technically demanding adjacent-organ resection; indirect evidence from retroperitoneal tumor surgery suggests that distal pancreatectomy, when required, can carry substantial short-term morbidity such as clinically significant pancreatic fistula and readmission.⁷ Because ACC-specific data are sparse, these findings mainly inform risk-benefit assessment rather than demonstrate oncologic advantage.⁷

Overall, the literature supports several recurring principles: negative margins are important, advanced local anatomy increases the risk of incomplete excision, nodal assessment may be most relevant in higher-risk disease, and open surgery is generally preferred when margin control is threatened by tumor extent.⁴¹² What remains uncertain is whether any subgroup derives a true therapeutic survival benefit from lymphadenectomy, how nodal dissection should be anatomically standardized, and when extended en bloc resection improves outcomes beyond what is necessary to achieve an R0 resection.⁵⁶² These uncertainties are likely to persist because ACC is rare and the evidence base remains dominated by retrospective surgical data rather than prospective trials.

Included Articles

• PMID 25938888: In nonmetastatic ACC undergoing adrenalectomy, a SEER-based retrospective study found that regional lymph node dissection defined as removal of 5 or more nodes was infrequently performed and was not associated with improved overall or disease-specific survival. The authors note nodal dissection may still aid staging, prognostic assessment, and surgical standardization.³

• PMID 26510563: In a population-based SEER cohort, lymphadenectomy during ACC surgery was infrequently performed and was not associated with improved disease-specific survival. Lymph node metastases were more common in locally advanced T3-T4 tumors, supporting consideration of nodal assessment in higher-risk localized or regional disease.⁴

• PMID 32111342: In a large NCDB analysis of resected ACC, positive margins occurred in 11.0% of cases and were associated with extra-adrenal extension, lymph node metastases, and distant metastases. Margin status did not differ significantly between open and minimally invasive approaches, underscoring the need for meticulous complete resection in anatomically advanced disease.¹

• PMID 34696848: This retrospective surgical series maps regional nodal metastasis patterns in ACC and suggests side-specific lymphadenectomy targets: para-caval nodes for right-sided tumors and para-aortic plus left renal-hilar nodes for left-sided tumors. The study emphasizes that lymphadenectomy boundaries remain undefined and should be guided by suspicious preoperative or intraoperative nodal findings.⁵

• PMID 37261486: This review describes indocyanine green near-infrared lymph node mapping as a feasible and safe intraoperative visual aid during lymphadenectomy for adrenocortical carcinoma or suspected locoregional recurrence. For adrenal surgery, the technique uses ultrasound-guided ipsilateral inguinal node injection to highlight paraaortic, paracaval, and inter-aortocaval nodes after about 15 minutes.⁶

• PMID 37925657: In a national retrospective cohort of 1175 adults with non-metastatic ACC, negative margins and stage were the main survival determinants, while multi-organ resection and lymphadenectomy were not associated with overall survival. Laparoscopic resection was linked to worse survival specifically in stage III disease, supporting an open approach for advanced localized tumors.²

• PMID 31843190: A retrospective series of distal pancreatectomy performed during multivisceral resection for non-pancreatic retroperitoneal tumors included 3 ACC cases and reported high rates of grade B postoperative pancreatic fistula and readmission. For ACC, the article is most relevant as indirect evidence that pancreatic extension of resection can carry substantial perioperative morbidity when required for en bloc clearance.⁷

References

Footnotes

1. Risk factors associated with positive resection margins in patients with adrenocortical carcinoma.. Am J Surg. 2020. PMID: 32111342. Local full text: 32111342.md ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹²

2. Defining Optimal Management of Non-metastatic Adrenocortical Carcinoma.. Ann Surg Oncol. 2024. PMID: 37925657. Local full text: 37925657.md ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸

3. Impact of Regional Lymph Node Dissection on Disease Specific Survival in Adrenal Cortical Carcinoma.. Horm Metab Res. 2015. PMID: 25938888. Local full text: 25938888.md ↩ ↩² ↩³ ↩⁴ ↩⁵

4. Does Lymphadenectomy Improve Survival in Patients with Adrenocortical Carcinoma? A Population-Based Study.. World J Surg. 2016. PMID: 26510563. Local full text: 26510563.md ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

5. Informing therapeutic lymphadenectomy: Location of regional metastatic lymph nodes in adrenocortical carcinoma.. Am J Surg. 2022. PMID: 34696848. Local full text: 34696848.md ↩ ↩² ↩³ ↩⁴ ↩⁵

6. Lymph node mapping with ICG near-infrared fluorescence imaging: technique and results.. Minim Invasive Ther Allied Technol. 2023. PMID: 37261486. Local full text: 37261486.md ↩ ↩² ↩³ ↩⁴

7. Postoperative pancreatic fistula after distal pancreatectomy for non-pancreas retroperitoneal tumor resection.. Am J Surg. 2020. PMID: 31843190. Local full text: 31843190.md ↩ ↩² ↩³