Specialized Scoring Contexts in ACC

Diagnostic Scoring and Grading Systems

Specialized scoring contexts in adrenocortical neoplasia are clinicopathologic settings in which standard adult histologic rules for distinguishing adrenocortical adenoma from adrenocortical carcinoma (ACC) are less reliable. Within ACC pathology, the best-established examples are oncocytic adrenocortical neoplasms and pediatric adrenocortical tumors, where several features counted as malignant in conventional adult systems may instead reflect baseline phenotype or age-related biology.¹²³

These frameworks are not separate disease classifications but modifications within the broader diagnostic workup of adrenal cortical tumors. Current reviews and classification updates continue to treat multiparameter morphology as the foundation of diagnosis, while recommending context-specific systems such as Lin-Weiss-Bisceglia for oncocytic tumors and Wieneke/AFIP-style criteria for pediatric tumors.⁴⁵³⁶ Mitotic activity, atypical mitoses, invasion, necrosis, and proliferation markers remain relevant across settings, but their meaning depends on the tumor subtype and clinical context.⁷⁶

The evidence base is limited by the rarity of these tumors and is derived mainly from retrospective series, expert reviews, and case reports.⁸⁹¹⁰ As a result, specialized scoring systems are best understood as structured aids to diagnosis and risk framing rather than definitive biologic tests of malignant potential. They may improve specificity compared with unmodified adult criteria in the settings for which they were designed, but reproducibility and prognostic precision remain imperfect.²¹¹

Diagnostic Context

Adult adrenal cortical tumor assessment has long centered on the Weiss system because no single morphologic feature consistently separates adenoma from carcinoma.¹² Reviews and classification statements continue to use Weiss-based assessment as the conventional reference framework in adult practice, while also acknowledging subjectivity in several components and nontrivial interobserver variation.⁸³⁶

Specialized systems were developed for situations in which these assumptions do not hold. In oncocytic tumors, diffuse architecture, eosinophilic cytoplasm, and nuclear atypia may be intrinsic to the subtype rather than strong evidence of aggressive behavior; in children, adult thresholds may correlate poorly with outcome.⁴⁹¹¹ The reliable principle is that malignancy assessment still depends on integrated histopathology. What is less reliable is applying a single adult threshold across all adrenal cortical neoplasms, so pathology interpretation generally needs to be subtype- and age-aware.¹⁶

This distinction frames the two main specialized applications represented in the literature.

Major Specialized Contexts

Oncocytic adrenocortical neoplasms

Oncocytic adrenocortical neoplasms are uncommon adrenal cortical tumors in which standard Weiss scoring may overestimate malignancy because several Weiss features are common baseline findings in the oncocytic phenotype.⁴¹²⁹ For this reason, the Lin-Weiss-Bisceglia system is generally used in preference to conventional Weiss criteria. In this framework, major criteria support malignant classification, minor criteria support uncertain malignant potential, and absence of both favors a benign designation.⁴¹²¹⁰

Across reviews and case-based literature, the findings most consistently linked to malignant behavior in this subtype are high mitotic activity, atypical mitoses, and venous invasion.⁹¹³¹⁴ Large size, high tumor weight, necrosis, and capsular or sinusoidal invasion may increase concern but appear less definitive when considered in isolation.¹⁵¹⁶¹³ What is relatively reliable is that a phenotype-adjusted system improves specificity compared with unmodified Weiss scoring. What remains less reliable is the prognosis of borderline lesions, so the category of uncertain malignant potential continues to have practical importance for postoperative surveillance and multidisciplinary interpretation.¹⁷¹⁰

Pediatric adrenocortical tumors

Pediatric adrenocortical tumors represent a second setting in which adult scoring may perform poorly. Retrospective pediatric data suggest that Weiss criteria are highly sensitive but insufficiently specific in children, potentially labeling tumors as malignant that do not behave like adult ACC.¹⁸¹¹ Pediatric-oriented systems such as the Wieneke or AFIP criteria are therefore generally favored in this context.⁵¹¹⁶

These approaches place greater emphasis on features that appear more closely associated with pediatric outcome, including capsular invasion, venous invasion, and elevated mitotic rate.¹⁸⁵ Available evidence also suggests that age modifies test performance, with very young children differing from older pediatric patients.¹¹ The dependable conclusion is that pediatric tumors should not be classified by adult criteria alone. The less certain issue is the exact prognostic calibration across all pediatric age groups, so histology is usually interpreted together with age, stage, endocrine presentation, and follow-up course rather than as a stand-alone predictor.⁵¹¹

Adjunctive Markers and Integrated Assessment

Because specialized scoring systems address only part of the diagnostic problem, they are typically used within a broader multiparameter framework. Reviews aligned with recent classification practice place Weiss-based methods, Lin-Weiss-Bisceglia, Wieneke, reticulin-based approaches, and Helsinki-style systems within the same larger effort to improve consistency in adrenal cortical tumor classification and grading.³⁶

Mitotic count remains one of the more reproducible biologic signals across systems, and Ki-67 may provide additional risk information when measured carefully and reported consistently.⁷³⁶ Other markers, including p53- or IGF-II-related findings, appear to have supportive rather than stand-alone diagnostic value.⁷⁵ The reliable implication is that ancillary markers may refine risk assessment, but they do not replace morphology-based diagnosis. In practical terms, this favors integrated reporting over dependence on any single stain, score, or isolated histologic feature.³⁶

More broadly, indirect comparative pathology literature is consistent with the enduring principle that lineage assignment and malignancy assessment are related but separate tasks, and that immunohistochemistry alone does not establish malignant behavior in adrenal cortical tumors.¹⁹²⁰²¹

Limitations and Pitfalls

The main advantage of specialized scoring is better contextual specificity than unmodified adult criteria, particularly in oncocytic and pediatric tumors.⁴¹¹ Its main limitation is that validation remains constrained by rarity, retrospective design, inconsistent outcome reporting, evolving terminology, and publication bias toward unusual or aggressive presentations.⁸⁹¹⁰

Several practical pitfalls follow from these constraints. Borderline categories remain common in oncocytic tumors, pediatric outcome is not fully captured by histology alone, and some criteria remain vulnerable to sampling error or observer variability.¹²¹¹² Ki-67 may add useful information, but its value declines when assessment methods are inconsistent or visually estimated rather than formally measured.³⁶ The most reliable clinical takeaway is that specialized systems are preferable to misapplied standard scoring in the contexts for which they were designed. It is less reliable to infer that any current scoring system, by itself, can determine recurrence risk, metastatic potential, or the need for adjuvant therapy.²³

Role in Management and Research

In clinical management, specialized scoring is primarily relevant after resection, when pathologic classification helps distinguish benign, malignant, and intermediate-risk categories that may influence surveillance intensity and multidisciplinary discussion. These systems do not replace imaging, endocrine evaluation, staging, or operative judgment; rather, they refine the pathology component of the standard ACC workflow.³⁶

As a research topic, specialized scoring highlights that adrenal cortical neoplasia is not pathologically uniform and that context-specific interpretation is necessary for rare phenotypes and age groups. Current literature suggests that future prognostic models may need to combine morphology with proliferation indices, molecular data, and clinical variables to improve reproducibility and outcome prediction beyond what morphology alone can provide.⁷³⁶

Included Articles

• PMID 17525483: This review emphasizes Weiss criteria as the main practical histologic system for distinguishing adrenocortical adenoma from carcinoma, using a threshold of three or more features, while noting interobserver subjectivity in some components. It also highlights that Weiss performs poorly in oncocytic and pediatric tumors, for which modified approaches such as Wieneke criteria are needed.¹

• PMID 18430754: This review emphasizes that ACC diagnosis remains reliant on multiparameter pathology scoring, especially the Weiss system, because no single morphologic feature is absolutely malignant. It also highlights limited reproducibility of several Weiss criteria and the need for modified approaches in pediatric and oncocytic adrenocortical tumors.²

• PMID 21455202: This pathology review emphasizes the Weiss criteria as the most useful histologic framework for distinguishing adrenal cortical adenoma from carcinoma, with three or more of nine features supporting carcinoma. It also notes practical diagnostic clues such as tumor size, necrosis, mitotic activity including atypical mitoses, and highlights separate pediatric and oncocytic criteria.⁸

• PMID 21820153: In a multicenter pediatric adrenocortical tumor series, the Wieneke scoring system aligned with clinical outcome, supporting its use as a simple reproducible prognostic tool in children, where adult histologic malignancy criteria are less reliable. Regressive myxoid change was frequent in malignant cases but is not part of the Wieneke score.¹⁸

• PMID 23147196: This review highlights that standard Weiss criteria require caution in adrenal oncocytic neoplasms and summarizes the Lin-Weiss-Bisceglia-style modification, in which major criteria indicate malignancy, minor criteria indicate uncertain malignant potential, and absence of both supports benign classification.⁴

• PMID 23496421: This review emphasizes that malignancy assessment in resected adrenocortical tumors still relies on careful gross examination plus the Weiss histologic criteria as the diagnostic gold standard, while highlighting important limitations in oncocytic and pediatric tumors. It also notes that Ki-67 labeling index and IGF-II expression may provide clinically relevant adjunctive information.⁷

• PMID 25254096: This case report notes that conventional Weiss criteria are not suitable for adrenocortical oncocytic neoplasms because several features are intrinsic to the oncocytic phenotype. It summarizes use of the modified Lin-Weiss-Bisceglia system, distinguishing benign lesions, uncertain malignant potential, and oncocytic carcinoma by major and minor histopathologic criteria.¹²

• PMID 27567308: In pediatric adrenocortical tumors, the Wieneke criteria were validated as a practical framework to separate carcinoma from adenoma, with capsular invasion, venous invasion, and mitotic rate over 15 per 20 HPF most strongly associated with malignancy. Ki-67 and p53 correlated with Wieneke-based classification and may serve as supplementary diagnostic markers.⁵

• PMID 28646944: This case report highlights oncocytic adrenocortical neoplasms as a rare adrenal tumor subtype that can mimic ACC preoperatively and emphasizes that malignancy assessment should use the Lin-Weiss-Bisceglia criteria rather than conventional Weiss-based scoring. It summarizes the major and minor LWB criteria and illustrates classification of a large nonfunctional malignant oncocytic tumor.²²

• PMID 29283337: This review and 16-case series emphasizes that oncocytic adrenocortical tumors can be overcalled as carcinoma by standard Weiss criteria because eosinophilic cytoplasm, nuclear atypia, and diffuse growth are common baseline features. It supports using Lin-Weiss-Bisceglia criteria in adults and Wienecke criteria in pediatric cases, with high mitotic count and atypical mitoses remaining key malignant signals.⁹

• PMID 31658010: This image-based case highlights oncocytic adrenocortical carcinoma and summarizes the Lin-Weiss-Bisceglia criteria used to classify malignant potential in oncocytic adrenal tumors, distinguishing definitional features from major and minor criteria. The reported tumor met two major and two minor criteria, supporting malignant classification.²³

• PMID 31772806: This case report summarizes use of the Lin-Weiss-Bisceglia system for oncocytic adrenocortical neoplasms, defining malignancy by any major criterion and borderline potential by any minor criterion. In the reported tumor, large size as the sole minor criterion supported classification as borderline malignant potential.¹⁷

• PMID 32249250: This case report highlights that oncocytic adrenocortical carcinoma can be difficult to distinguish from oncocytic adenoma on routine evaluation and supports combining Weiss criteria with the Lin-Weiss-Bisceglia system to assess malignant potential. In the reported tumor, Weiss 6/9 and fulfillment of two major Lin-Weiss-Bisceglia criteria established malignancy.²⁴

• PMID 35288842: The 2022 WHO classification retains classic ACC diagnostic criteria while expanding recommended use of multiparameter schemes, including Weiss, modified Weiss, reticulin, Helsinki, Lin-Weiss-Bisceglia for oncocytic tumors, and Wieneke for pediatric neoplasms. It also emphasizes mitotic count and Ki-67 for dynamic risk stratification, with grade defined by mitotic rate rather than Ki-67 thresholds.³

• PMID 35946194: This case report highlights oncocytic adrenocortical carcinoma as a rare ACC variant best classified with the Lin-Weiss-Bisceglia system rather than conventional Weiss criteria. Malignancy was supported by venous and capsular invasion, large tumor size and weight, and necrosis in a purely oncocytic neoplasm.¹⁵

• PMID 36753311: This mini review in pediatric adrenocortical carcinoma found that the Weiss score has very low specificity despite perfect sensitivity, whereas the AFIP/Wieneke score shows substantially better specificity with only slightly lower sensitivity. The findings support AFIP over Weiss for pediatric risk classification and highlight age-related performance differences, especially in children under 4 years.¹¹

• PMID 37959390: This review of 287 adrenal oncocytic neoplasms emphasizes that malignant potential in the oncocytic ACC spectrum is classified with the Lin-Weiss-Bisceglia system rather than standard Weiss criteria alone. Major criteria indicate malignancy, minor criteria support uncertain malignant potential, and the framework is used because no single parameter reliably separates benign from malignant oncocytic tumors.¹⁰

• PMID 38302362: This case of adrenocortical oncocytic carcinoma highlights the value of the Lin-Weiss-Bisceglia criteria for classifying oncocytic adrenal cortical tumors, with diagnosis supported by mitotic activity, atypical mitoses, necrosis, and suspicious capsular invasion after a misleading preoperative biopsy.¹⁶

• PMID 40979003: This case report illustrates use of the Lin-Weiss-Bisceglia criteria to diagnose oncocytic adrenocortical carcinoma, with major criteria including high mitotic rate, atypical mitoses, and venous invasion, and minor criteria including large size, high weight, and necrosis. It reinforces the role of this scoring system in distinguishing malignant oncocytic adrenal tumors from borderline or benign oncocytic neoplasms.¹³

• PMID 41050038: This case report highlights that oncocytic adrenocortical carcinoma should be assessed with the Lin-Weiss-Bisceglia system rather than the traditional Weiss score. Malignancy was supported by major criteria including high mitotic activity and vascular invasion, with additional high-risk features such as necrosis and Ki-67 greater than 20%.¹⁴

• PMID 41606708: This review emphasizes that adult adrenal cortical tumors are still primarily classified with the Weiss system, while pediatric tumors use Wieneke criteria and oncocytic tumors require scenario-specific systems such as Lin-Weiss-Bisceglia. It highlights important caveats, including limited reliability in myxoid lesions and the need for properly assessed Ki-67 because visual estimation is discouraged.⁶

• PMID 16617711: A veterinary case report described use of accepted histomorphologic classification schemes plus immunohistochemistry to classify a hepatic carcinoma in a ferret that also had bilateral adrenocortical hyperplasia. Its relevance to ACC is indirect and mainly supports the general point that morphology-based tumor classification often requires ancillary confirmation in diagnostically overlapping settings.²⁰

• PMID 23242804: A bovine adrenal tumor series is only indirectly relevant to ACC, but it supports the note’s background framing that adrenal neoplasm classification relies on combined morphology and immunohistochemistry, with malignancy in adrenocortical tumors remaining primarily a histologic judgment rather than an immunostain-based one.¹⁹

• PMID 30860644: A canine comparative pathology study developed the Utrecht score, combining Ki-67 with necrosis and clear/vacuolated cytoplasm to stratify postoperative prognosis in cortisol-secreting adrenocortical tumors. Although indirect to human ACC, it supports the note’s emphasis on observer variability and on integrated histologic-proliferative assessment rather than sole reliance on classic morphologic rules.²¹

References

Footnotes

1. Recent advances in histopathology and immunohistochemistry of adrenocortical carcinoma.. Endocr Pathol. 2006. PMID: 17525483. Local full text: 17525483.md ↩ ↩² ↩³ ↩⁴

2. Pathological and molecular features of adrenocortical carcinoma: an update.. J Clin Pathol. 2008. PMID: 18430754. Local full text: 18430754.md ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

3. Overview of the 2022 WHO Classification of Adrenal Cortical Tumors.. Endocr Pathol. 2022. PMID: 35288842. Local full text: 35288842.md ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹

4. Adrenal oncocytic neoplasm: a systematic review.. Urol Int. 2013. PMID: 23147196. Local full text: 23147196.md ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

5. Weineke criteria, Ki-67 index and p53 status to study pediatric adrenocortical tumors: Is there a correlation?. J Pediatr Surg. 2016. PMID: 27567308. Local full text: 27567308.md ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

6. Assessment of Adrenal Cortical Neoplasms for the GU Pathologist.. Adv Anat Pathol. 2026. PMID: 41606708. Local full text: 41606708.md ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹²

7. Discerning malignancy in resected adrenocotical tumors.. Expert Opin Med Diagn. 2008. PMID: 23496421. Local full text: 23496421.md ↩ ↩² ↩³ ↩⁴ ↩⁵

8. Adrenal cortical tumors, pheochromocytomas and paragangliomas.. Mod Pathol. 2011. PMID: 21455202. Local full text: 21455202.md ↩ ↩² ↩³ ↩⁴

9. Oncocytic Adreno Cortical Tumors: Pathological Features of 16 Cases and Review of the Literature.. J Environ Pathol Toxicol Oncol. 2017. PMID: 29283337. Local full text: 29283337.md ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

10. Prognosis of Adrenal Oncocytic Neoplasms (AONs): Literature Review of 287 Cases and Presentation of the Oldest Patient.. J Clin Med. 2023. PMID: 37959390. Local full text: 37959390.md ↩ ↩² ↩³ ↩⁴ ↩⁵

11. Prognostic value of the Weiss and Wieneke (AFIP) scoring systems in pediatric ACC - a mini review.. Endocr Relat Cancer. 2023. PMID: 36753311. Local full text: 36753311.md ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹

12. Case report: Heterotopic intrarenally located adrenocortical oncocytoma.. F1000Res. 2014. PMID: 25254096. Local full text: 25254096.md ↩ ↩² ↩³ ↩⁴

13. Oncocytic Carcinoma: A Rare Hormone-Producing Tumor.. Cureus. 2025. PMID: 40979003. Local full text: 40979003.md ↩ ↩² ↩³

14. Rapidly Progressive Metastatic Adrenocortical Carcinoma With Oncocytic Features in a Young Male: A Case Report.. Cureus. 2025. PMID: 41050038. Local full text: 41050038.md ↩ ↩²

15. Oncocytic variant of adrenocortical carcinoma: A rare entity.. Indian J Cancer. 2022. PMID: 35946194. Local full text: 35946194.md ↩ ↩²

16. Adrenocortical oncocytic carcinoma misdiagnosed as adrenal cortical adenoma.. Asian J Surg. 2024. PMID: 38302362. Local full text: 38302362.md ↩ ↩²

17. A Rare Concomitant Oncocytic Adrenocortical Neoplasm and Hepatocellular Carcinoma over a Four-year Duration: A Case Report and Review of Literature.. Case Rep Pathol. 2019. PMID: 31772806. Local full text: 31772806.md ↩ ↩²

18. Pediatric adrenocortical tumors: morphological diagnostic criteria and immunohistochemical expression of matrix metalloproteinase type 2 and human leucocyte-associated antigen (HLA) class II antigens. Results from the Italian Pediatric Rare Tumor (TREP) Study project.. Hum Pathol. 2012. PMID: 21820153. Local full text: 21820153.md ↩ ↩² ↩³

19. Histologic and immunohistochemical classification of 41 bovine adrenal gland neoplasms.. Vet Pathol. 2013. PMID: 23242804. Local full text: 23242804.md ↩ ↩²

20. Peliod hepatocellular carcinoma in a domesticated ferret (Mustela putorius furo).. J Vet Diagn Invest. 2006. PMID: 16617711. Local full text: 16617711.md ↩ ↩²

21. The Utrecht Score: A novel histopathological scoring system to assess the prognosis of dogs with cortisol-secreting adrenocortical tumours.. Vet Comp Oncol. 2019. PMID: 30860644. Local full text: 30860644.md ↩ ↩²

22. Oncocytic adrenocortical carcinoma: a rare adrenal tumor subtype.. Can J Urol. 2017. PMID: 28646944. Local full text: 28646944.md ↩

23. Images - Oncocytic adrenocortical carcinoma: A rare tumor variant.. Can Urol Assoc J. 2020. PMID: 31658010. Local full text: 31658010.md ↩

24. A rare case of oncocytic adrenocortical carcinoma clinically presented as an incidentaloma.. Endocr J. 2020. PMID: 32249250. Local full text: 32249250.md ↩