Adrenal incidentaloma follow-up is influenced by patient, radiologic, and medical provider factors: A review of 804 cases

Prospective Study of a System-Wide Adrenal Incidentaloma Quality Improvement Initiative

BACKGROUND

Appropriate follow-up of incidental adrenal masses (IAMs) is infrequent. We implemented a quality improvement (QI) program to improve management of IAMs.

STUDY DESIGN

This system-wide initiative targeted primary care providers (PCPs) after IAM detection. It incorporated (1) chart-based messages and emails to PCPs, (2) an evidence-based IAM evaluation algorithm, (3) standardized recommendations in radiology reports, and (4) access to a multispecialty adrenal clinic. Patients diagnosed with an IAM from January 1, 2018, to December 31, 2019, were prospectively included (the "QI cohort") and compared with a historical, preintervention cohort diagnosed with IAMs in 2016. The primary outcomes were the initiation of an IAM investigation by the PCP, defined as relevant clinical history-taking, laboratory screening, follow-up imaging, or specialist referral.

RESULTS

The QI cohort included 437 patients and 210 in the historical cohort. All patients had 12 months or more of follow-up. In the QI cohort, 35.5% (155 of 437) met the primary endpoint for PCP-initiated evaluation, compared with 27.6% (58 of 210) in the historical cohort (p = 0.0496). Among the subgroup with a documented PCP working within our health system, 46.3% (74 of 160) met the primary endpoint in the QI cohort vs 33.3% (38 of 114) in the historical cohort (p = 0.035). After adjusting for insurance status, presence of current malignancy, initial imaging setting (outpatient, inpatient, or emergency department), and having an established PCP within our health system, patients in the QI cohort had 1.70 times higher odds (95% CI 1.16 to 2.50) of undergoing a PCP-initiated IAM evaluation. Adrenal surgery was ultimately performed in 2.1% (9 of 437) of QI cohort patients and 0.95% (2 of 210) of historical cohort patients (p = 0.517).

CONCLUSIONS

This simple, moderately labor-intensive QI intervention was associated with increased IAM evaluation initiated by PCPs.

Assessing the Frequency of Deferrable Thyroid Nodule Biopsies to De-escalate Low-Value Care

OBJECTIVE

Thyroid nodules are common, yet fewer than 1 in 10 harbors malignancy. When present, thyroid cancer is typically indolent with excellent survival. Therefore, patients who are not candidates for thyroid cancer treatment due to comorbid disease may not require further thyroid nodule evaluation. The goal of this study was to determine the rate of deferrable thyroid nodule biopsies in patients with limited life expectancy.

METHODS

We identified patients who underwent thyroid fine needle aspiration (FNA) between 2015 and 2018 at our institution. The primary outcome was the number of deferrable FNAs, defined as FNAs performed in patients who died within 2 years after biopsy. Secondary outcomes included cytologic Bethesda score, procedure costs, and final diagnosis on surgical pathology. Multivariable logistic and Cox proportional hazards regressions were used to evaluate factors associated with FNA in patients with limited life expectancy.

RESULTS

A total of 2565 FNAs were performed. Most patients were female (79%), and 37 (1.5%) patients died within 2 years. Nonthyroid specialists were significantly more likely to order deferrable FNAs (odds ratio 4.13, P < .001). Of the patients who died within 2 years, most (78%) had a concomitant diagnosis of nonthyroid cancer, and 4 went on to have thyroid surgery (Bethesda scores: 3, 4, 4, and 6). Spending associated with deferrable FNAs and subsequent surgery totaled over $98 000.

CONCLUSIONS

Overall, the rate of deferrable thyroid nodule biopsies was low. However, there is an opportunity to reduce low-value biopsies in patients with a concurrent nonthyroid cancer by partnering with oncology providers.

To report hounsfeld units or not: There is no question

INTRODUCTION

Most adrenal incidentalomas are not appropriately evaluated. Reporting the mass in the radiology report summary and providing recommendations in the report can positively impact evaluation. This study evaluated the effect of reporting Hounsfield units(HU) on adrenal incidentaloma follow-up.

METHODS

Patients with adrenal incidentalomas identified on noncontrast CT scan from 2015 to 2020 ​at a tertiary care institution were studied. Chart review was conducted. Patient and imaging characteristics were compared between patients who did and did not have HU reported. Outcomes of interest were 1)outpatient referral, 2)biochemical evaluation, and 3)dedicated imaging if appropriate. Multivariate analysis determined the impact of HU, reporting in the summary and provision of recommendations on the outcomes.

RESULTS

363 patients were studied, 36(9.9 ​%) had HU reported. When HU were used in addition to recommendations and reporting in the summary, the likelihood of outpatient referral increased from 10.1 to 32.6-fold (95%CI 7.7-138.1, p ​< ​0.001). Similarly, the likelihood of biochemical workup increased from 2.5 to 7.8-fold (95%CI 2.5-24.1, p ​< ​0.001).

CONCLUSION

Recording adrenal incidentaloma HU on non-contrast CT scans was associated with increased rates of outpatient referral and biochemical workup.

Automated extraction of incidental adrenal nodules from electronic health records

BACKGROUND

Many adrenal incidentalomas do not undergo appropriate biochemical testing and complete imaging characterization to assess for hormone hypersecretion and malignancy. With the growing availability of clinical narratives in the electronic medical record, automated surveillance using advanced data analytic techniques may represent a promising method to improve management.

METHODS

A data provisioning process using a series of structured query language scripts was used to abstract all chest and abdominal computed tomography and magnetic resonance imaging reports from an academic health care system in 2018. The narratives and impressions were queried for key text relating to the identification of adrenal incidentalomas. Patients with a history of extra-adrenal malignancy undergoing staging or surveillance imaging were excluded. The prevalence and radiographic characteristics were analyzed. Patients with adrenal incidentalomas newly identified in 2018 were assessed for biochemical testing and nodule stability through August 2021.

RESULTS

Of 36,618 patients queried, 8,557 were excluded owing to a history of extra-adrenal malignancy. Data from 447 patients were flagged by the structured query language scripts and electronically abstracted. On internal validation, 307/447 (69%) patients were correctly identified as having adrenal nodules (1.1% overall prevalence). The median patient age was 67 years, and 56% were female. The median nodule size was 1.7 (IQR 1.3-2.5) cm, 9% were bilateral, and 63% were low density (unenhanced Hounsfield units <10). Adrenal carcinoma was identified in 10 patients. In 2018, 121 patients were diagnosed with a new adrenal incidentaloma. Of 32 (27%) patients who had follow-up imaging at a median of 1.9 years, 97% of nodules were stable in size. Biochemical testing was performed in 53 patients (44%), of which 31 (26%) had complete hormonal assessment; 14 (26%) were functional nodules: 7 aldosterone-secreting, 4 cortisol-secreting, and 3 pheochromocytoma.

CONCLUSION

Only one-fourth of patients received appropriate biochemical testing after incidental diagnosis of an adrenal nodule, and most nodules with indeterminate imaging characteristics did not undergo follow-up imaging. Advanced data analytic techniques on electronic imaging reports may aid in the clinical identification and improved management of patients with adrenal incidentalomas.

A Standardized Radiology Template Improves Incidental Adrenal Mass Follow-Up: A Prospective Effectiveness and Implementation Study

PURPOSE

Incidental adrenal masses (IAMs) are common but rarely evaluated. To improve this, we developed a standardized radiology report recommendation template and investigated its implementation and effectiveness.

METHODS

We prospectively studied implementation of a standardized IAM reporting template as part of an ongoing quality improvement initiative, which also included primary care provider (PCP) notifications and a straightforward clinical algorithm. Data were obtained via medical record review and a survey of radiologists. Outcomes included template adoption rates and acceptability (implementation measures), as well as the proportion of patients evaluated and time to follow-up (effectiveness outcomes).

RESULTS

Of 4,995 imaging studies, 200 (4.0%) detected a new IAM. The standardized template was used in 54 reports (27.0%). All radiologists surveyed were aware of the template, and 91% affirmed that standardized recommendations are useful. Patients whose reports included the template were more likely to have PCP follow-up after IAM discovery compared with those with no template (53.7% versus 36.3%, P = .03). After adjusting for sex, current or prior malignancy, and provider ordering the initial imaging (PCP, other outpatient provider, or emergency department or inpatient provider), odds of PCP follow-up remained 2.0 times higher (95% confidence interval 1.02-3.9). Patients whose reports included the template had a shorter time to PCP follow-up (log-rank P = .018). PCPs ultimately placed orders for biochemical testing (35.2% versus 18.5%, P = .01), follow-up imaging (40.7% versus 23.3%, P = .02), and specialist referral (22.2% versus 4.8%, P < .01) for a higher proportion of patients who received the template compared with those who did not.

CONCLUSIONS

Use of a standardized template to communicate IAM recommendations was associated with improved IAM evaluation. Our template demonstrated high acceptability, but additional strategies are necessary to optimize adoption.

Impact of dedicated multidisciplinary service on patient selection and outcomes for surgical treatment of primary aldosteronism

BACKGROUND

Primary aldosteronism is the most common surgically curable cause of endocrine hypertension. Management of the unilateral subtype of primary aldosteronism with adrenalectomy requires multidisciplinary input. It is unclear if a dedicated endocrine hypertension service confers better outcomes compared to standard care offered by individual clinicians.

METHODS

In this retrospective study, patients from the Monash University Endocrine Surgery Database were divided into either the endocrine hypertension service group, where patients were managed by a dedicated multidisciplinary team, or the standard group, where patients were managed by individual clinicians. The comparisons included patient selection for surgery, perioperative blood pressure control, and surgical cure rate.

RESULTS

Despite similar perioperative blood pressure, patients in the endocrine hypertension service group (n = 41) were on fewer antihypertensive medications (1 vs 2, P = .011) compared to the standard group (n = 55). A larger proportion of patients in the endocrine hypertension service group had either bilateral adrenal nodules or no adrenal lesions on computed tomography (41% vs 18%, P = .013). Patients in the standard group had larger adrenal lesions on computed tomography (median 15 mm vs 10 mm, P = .032). Postoperatively, the biochemical cure rate was higher in the endocrine hypertension service group at 6 to 12 months (97% vs 76%, P = .021).

CONCLUSION

Patients managed by endocrine hypertension service were more likely to be diagnosed with surgically curable primary aldosteronism without a unilateral adrenal adenoma on imaging, required fewer medications for perioperative blood pressure control, and experienced superior postoperative outcomes. Referral to a dedicated endocrine hypertension service is recommended for patients with primary aldosteronism who wish to pursue a surgical cure.

Prevalence and Characteristics of Adrenal Tumors in an Unselected Screening Population : A Cross-Sectional Study

BACKGROUND

With the widespread use of advanced imaging technology, adrenal tumors are increasingly being identified.

OBJECTIVE

To investigate the prevalence and characteristics of adrenal tumors in an unselected screening population in China.

DESIGN

Cross-sectional study. (ClinicalTrials.gov: NCT04682938).

SETTING

A health examination center in China.

PATIENTS

Adults having an annual checkup were invited to be screened for adrenal tumors by adrenal computed tomography.

MEASUREMENTS

The participants with adrenal tumors had further evaluation for malignancy risk and adrenal function.

RESULTS

A total of 25 356 participants were screened, 351 of whom were found to have adrenal tumors, for a prevalence of 1.4%. The prevalence increased with age, from 0.2% in participants aged 18 to 25 years to 3.2% in those older than 65 years. Among 351 participants with adrenal tumors, 337 were diagnosed with an adrenocortical adenoma, 14 with another benign nodule, and none with a malignant mass. In 212 participants with an adenoma who completed endocrine testing, 69.3% were diagnosed with a nonfunctioning adenoma, 18.9% with cortisol autonomy, 11.8% with primary aldosteronism, and none with pheochromocytoma. Proportions of nonfunctioning adenomas were similarly high in various age groups (72.2%, 67.8%, and 72.2% in those aged <46, 46 to 65, and ≥66 years, respectively).

LIMITATION

Only 212 of 337 participants with an adrenocortical adenoma had endocrine testing.

CONCLUSION

The prevalence of adrenal tumors in the general adult screening population is 1.4%, and most of these tumors are nonfunctioning regardless of patient age. Cortisol and aldosterone secretion are the main causes of functional adenomas.

PRIMARY FUNDING SOURCE

National Key Research and Development Program of China and National Natural Science Foundation of China.

Virtual non-contrast detector-based spectral CT predictably overestimates tissue density for the characterisation of adrenal lesions compared to true non-contrast CT

PURPOSE

To establish if virtual non-contrast (VNC) images generated from contrast-enhanced detector-based spectral CT could replace true non-contrast (TNC) imaging for the characterisation of adrenal masses.

METHODS

TNC and VNC images were retrospectively reviewed for 39 patients with one or more adrenal lesions who underwent contrast-enhanced spectral CT of the upper abdomen. Lesions were categorised as either 'adenoma' or 'indeterminate/other lesion' based on current reference standards. The CT density of each lesion was measured on both image sets by two readers and compared using Wilcoxon signed-rank test. ROC analysis with Youden's J index method was performed to determine the optimal attenuation cut-off for diagnosing benign adenoma on VNC images.

RESULTS

Forty-four lesions were included, 37 of which were diagnosed as adenomas. There were significant differences between TNC and VNC measurements for both readers (mean difference 9.1 HU for reader 1; 9.8 HU for reader 2; p < 0.01). Optimal attenuation thresholds for diagnosing adenomas on VNC were 25.3 HU (reader 1) and 23.9 HU (reader 2) for the entire population, and 18.3 HU (reader 1) and 19.7 HU (reader 2) for lipid-rich adenomas < 10 HU on TNC imaging.

CONCLUSION

There is insufficient evidence to support the use of VNC as a substitute for TNC images in the characterisation of adrenal lesions. VNC using a detector-based spectral CT scanner shows a predictable increase in attenuation values compared to TNC. Thus, future studies might be better directed towards finding a new threshold value for diagnosing benign adrenal adenomas on VNC imaging.

Management of incidental adrenal nodules: a survey of abdominal radiologists conducted by the Society of Abdominal Radiology Disease-Focused Panel on Adrenal Neoplasms

Adrenal incidentalomas are common findings discovered at abdominal CT and MRI, yet the most appropriate management remains controversial and guidelines vary. The Society of Abdominal Radiology (SAR) Disease-Focused Panel on Adrenal Neoplasms sought to determine the practice patterns of abdominal radiologists regarding the interpretation and management of adrenal incidentalomas. An electronic survey consisting of eleven multiple choice questions about adrenal incidentalomas was developed and distributed to the email list of current and past SAR members. The response rate was 11.8% (423/3581) and most respondents were academic radiologists (80.6%). The 2017 American College of Radiology White Paper was the most used guideline, yet the management of indeterminate adrenal incidentalomas was highly variable with no single management option reaching a majority. Hormonal evaluation and endocrinology consultation was most often rarely or never recommended. The results of the survey indicate wide variability in the interpretation of imaging findings and management recommendations for incidental adrenal nodules among surveyed radiologists. Further standardization of adrenal incidentaloma guidelines and education of radiologists is needed.

Missed Opportunities to Promptly Diagnose and Treat Adrenal Tumors

INTRODUCTION

Adrenal mass management guidelines are insufficiently applied, and timeliness of treatment is unknown. We evaluated missed opportunities to promptly diagnose and treat adrenal tumors that ultimately required adrenalectomy.

METHODS

From the Veterans Affairs Corporate Data Warehouse, we identified patients who underwent adrenalectomy (2010-2016) in the South-Central Veterans Affairs HealthCare Network and reviewed their records. Diagnostic timeliness was assessed by the interval between initial (index) imaging with adrenal abnormality and the next diagnostic step. Workup was defined as early (interval ≤6 mo) or late (>6 mo). Adrenalectomy was considered prompt when the interval between index imaging and adrenalectomy was ≤12 mo and delayed when this was >12 mo. We quantified diagnostic and treatment delays and assessed factors associated with delayed adrenalectomy.

RESULTS

During the study period, 84 patients underwent adrenalectomy: male (86.9%), White (57.1%), with a mean age of 58.7 y (±8.8). Of those, 25 (29.8%) had late workup, and 36 (42.9%) had delayed surgery (median interval: 44 mo, range 14-282). Late hormonal workup occurred in 24 of 36 (66.7%) patients with delayed surgery, compared with one of 48 (2.1%, P < 0.001) with prompt surgery.

CONCLUSIONS

Missed opportunities in prompt diagnosis and treatment were common in patients with adrenal masses ultimately requiring adrenalectomy. Late hormonal workup is associated with delayed adrenalectomy. Interventions are needed to aid clinicians to recognize the presence, promptly evaluate, and make guideline-informed decisions on the management of an adrenal mass.

Computer-assisted Reporting and Decision Support Increases Compliance with Follow-up Imaging and Hormonal Screening of Adrenal Incidentalomas

OBJECTIVE

To assess the impact of using a computer-assisted reporting and decision support (CAR/DS) tool at the radiologist point-of-care on ordering provider compliance with recommendations for adrenal incidentaloma workup.

METHOD

Abdominal CT reports describing adrenal incidentalomas (2014 - 2016) were retrospectively extracted from the radiology database. Exclusion criteria were history of cancer, suspected functioning adrenal tumor, dominant nodule size < 1 cm or ≥ 4 cm, myelolipomas, cysts, and hematomas. Multivariable logistic regression models were employed to predict follow-up imaging (FUI) and hormonal screening orders as a function of patient age and sex, nodule size, and CAR/DS use. CAR/DS reports were compared to conventional reports regarding ordering provider compliance with, frequency, and completeness of, guideline-warranted recommendations for FUI and hormonal screening of adrenal incidentalomas using Chi-square test.

RESULT

Of 174 patients (mean age 62.4; 51.1% women) with adrenal incidentalomas, 62% (108/174) received CAR/DS-based recommendations versus 38% (66/174) unassisted recommendations. CAR/DS use was an independent predictor of provider compliance both with FUI (Odds Ratio [OR]=2.47, p = 0.02) and hormonal screening (OR=2.38, p = 0.04). CAR/DS reports recommended FUI (97.2%,105/108) and hormonal screening (87.0%,94/108) more often than conventional reports (respectively, 69.7% [46/66], 3.0% [2/66], both p <0.0001). CAR/DS recommendations more frequently included instructions for FUI time, protocol, and modality than conventional reports (all p <0.001).

CONCLUSION

Ordering providers were at least twice as likely to comply with report recommendations for FUI and hormonal evaluation of adrenal incidentalomas generated using CAR/DS versus unassisted reporting. CAR/DS-directed recommendations were more adherent to guidelines than those generated without.

Incidental Adrenal Masses: Adherence to Guidelines and Methods to Improve Initial Follow-Up, A Systematic Review

OBJECTIVE

Incidental adrenal masses (IAMs) are detected in approximately 1%-2% of abdominal computed tomography (CT) scans. Recent estimates suggest that more than 70-million relevant CT scans are performed annually in the United States; thus, IAMs represent a significant clinical entity. Most clinical guidelines recommend an initial follow-up evaluation that includes imaging and biochemical testing after index IAM detection.

METHODS

Systematic review of literature in the PubMed, EMBASE and Web of Science databases to determine whether guidelines regarding IAM evaluation are followed and to identify effective management strategies. Our initial search was in January 2018 and updated in November, 2019.

RESULTS

31 studies met inclusion criteria. In most institutions, only a minority of patients with IAMs undergo initial follow-up imaging (median 34%, IQR 20%-50%) or biochemical testing (median 18%, IQR 15%-28%). 2 interventions shown to improve IAM evaluation are IAM-specific recommendations in radiology reports and dedicated multi-disciplinary teams. Interventions focused solely on alerting the ordering clinician or primary care provider to the presence of an IAM have not demonstrated effectiveness. Patients who are referred to an endocrinologist are more likely to have a complete IAM evaluation, but few are referred.

DISCUSSION

Most patients with an IAM do not have an initial evaluation. The radiology report has been identified as a key component in determining whether IAMs are evaluated appropriately. Care teams dedicated to management of incidental radiographic findings also improve IAM follow-up. Although the evidence base is sparse, these interventions may be a starting point for further inquiry into optimizing care in this common clinical scenario.

Radiology report language positively influences adrenal incidentaloma guideline adherence

BACKGROUND

Adrenal incidentalomas are common radiographic findings. Guidelines recommend biochemical and radiographic surveillance of adrenal incidentalomas. We investigated if patients were appropriately referred for outpatient evaluation.

METHODS

Retrospective chart review was performed to identify patients with adrenal masses on imaging between November 7, 2016 and November 7, 2017. Demographic information, medical history, and outpatient referral information was collected.

RESULTS

11,723 computed tomography (CT) scans of the chest and/or abdomen/pelvis were performed. 246 patients were noted to have adrenal incidentalomas and met inclusion criteria. The CT report recommended follow-up in 63/246 cases (25.6%). 38/246 (15.4%) patients were referred for evaluation. Age, adrenal nodule size, and type of evaluating provider did not affect referral. A radiology report recommending follow-up was associated with increased referral rate (OR 5.441, 95% CI: 2.491-11.887).

CONCLUSION

There was low outpatient referral for adrenal incidentalomas. Language in the radiology report significantly influenced referral rates and may be an important resource for improving guideline adherence.

Strategies to optimize management of incidental radiographic findings in the primary care setting: A mixed methods study

BACKGROUND

Incidental adrenal masses (IAMs) are common. Primary care providers (PCPs) are frequently responsible for incidentaloma evaluations. We evaluated whether PCPs view this paradigm effective, barriers faced, and strategies to optimize care delivery.

METHODS

This is a sequential explanatory study, comprised of surveys followed by focus groups of PCPs. Because lung nodules are another type of common incidental finding, we compared PCP views on management of lung nodules to their views on IAMs.

RESULTS

For IAMs, 22.3% of PCPs "always refer" to specialists, but for lung nodules this was 11.5% (p = 0.026). For lung nodules, the most significant barrier was insufficient time/support to longitudinally follow results (69%), but for IAMs it was uncertainty about which tests to order (68%). Fear of litigation was equal (lung = 22.5%, IAMs = 21.3%). Consistent themes regarding the "ideal" system included specific recommendations in radiology reports; automation of orders for follow-up tests; longitudinal tracking tools; streamlined consultations; and decision guides embedded within the electronic health record.

CONCLUSIONS

Respondents are more comfortable with lung nodules than IAMs. Management of "incidentalomas" is within their scope of practice, but the current system can be optimized.

Adrenal Incidentaloma

An adrenal incidentaloma is now established as a common endocrine diagnosis that requires a multidisciplinary approach for effective management. The majority of patients can be reassured and discharged, but a personalized approach based upon image analysis, endocrine workup, and clinical symptoms and signs are required in every case. Adrenocortical carcinoma remains a real concern but is restricted to <2% of all cases. Functional adrenal incidentaloma lesions are commoner (but still probably <10% of total) and the greatest challenge remains the diagnosis and optimum management of autonomous cortisol secretion. Modern-day surgery has improved outcomes and novel radiological and urinary biomarkers will improve early detection and patient stratification in future years to come.

Adherence to guidelines for hormonal evaluation in patients with incidentally detected adrenal nodules: effects of radiology report wording and standardized reporting

OBJECTIVE

To compare the rates of hormonal evaluation in patients who had CT reports describing adrenal incidentalomas with and without a specific recommendation for hormonal evaluation.

MATERIALS AND METHODS

We performed a retrospective review of adult outpatients without a history of cancer who had a CT report describing an incidental adrenal nodule. Radiology reports were reviewed to determine whether a standardized macro was used which gave specific recommendations for hormonal evaluation and endocrinology consultation. If no macro was used it was determined whether the report had a recommendation for hormonal evaluation and endocrinology consultation.

RESULTS

A standardized macro recommending hormonal evaluation and endocrinology referral was used in 45/129 (34.8%) reports that described an incidental adrenal nodule. A recommendation for hormonal evaluation was made in 5/84 (6.0%) reports without a macro. Hormonal evaluation was performed in 24/50 (48.0%) patients whose reports recommended it and in 11/79 (13.9%) patients whose reports did not (p < 0.0001). A recommendation for endocrinology referral was made in 2/84 (2.4%) reports without a macro. Patients were seen by endocrinology in 12/47 (25.5%) patients whose reports recommended an endocrinology referral evaluation and 5/82 (6.1%) patients whose reports did not (p < 0.0001). Hormonal evaluation was performed in 17/17 (100%) patients who were seen by endocrinology and 18/112 (16.1%) patients who were not (p < 0.0001). Eleven patients (8.5%) had an evaluation suggesting hyperfunctioning nodules (4 cortisol producing, 6 aldosterone producing, and 1 pheochromocytoma).

CONCLUSIONS

Utilizing standardized macros that make specific recommendations for hormonal evaluation in patients with adrenal incidentalomas leads to improved adherence to clinical guidelines.

Clinical Characteristics and Follow-Up Results of Adrenal Incidentaloma

It is recommended that adrenal incidentaloma patients should be monitored for radiological changes, increase in size and new functionality that may occur in the future, even if they are benign and nonfunctional at the initial evaluation. Our aim is to evaluate the key clinical characteristics of adrenal incidentaloma patients focusing on changes during follow-up and associated clinical outcomes. A total of 755 patients (median age: 56 years), with an adrenal incidentaloma > 1 cm and underwent functionality tests, were included in the study. Clinical characteristics, functionality status and follow-up durations were recorded. During the course of follow-up, any changes in size and development of new functionality, and clinical consequences thereof were evaluated. In 71.8% of patients, incidentalomas were non-functional. Most frequent functionality (15.8%, n=119) was subclinical hypercortisolemia (SH) [10.9% (n=82) possible autonomous cortisol secretion (PACS) and 4.9% (n=37) autonomous cortisol secretion (ACS)] of all incidentalomas. Frequencies of Cushing's syndrome (CS), pheochromacytoma and primary hyperaldosteronism were 4.9% (n=37), 3.8% (n=29) and 3.7% (n=28), respectively. Adrenocortical carcinoma frequency was 1.5% (n=11). Of 755 patients, 43% (n=325) were followed up regularly more than 6 months. Median follow-up duration was 24 months (6-120). A total of 17 (5.2%) patients, which had non-functional incidentalomas at baseline had developed new functionality during follow-up, of which 15 (4.6%) were SH [13 patients (4%) PACS and 2 patients (0.6%) ACS] and 2 (0.6%) were CS. During follow-up, 24% (n=78) of the patients had an increase in mass size between 5-9 mm, while 11.7% (n=38) of the patients had an increase of ≥10 mm. During follow-up, 4% (n=13) of the patients developed a new lesion with a diameter ≥10 mm on the opposite side. In patients with a follow-up duration of more than 2 years, frequencies of size increase and new lesion emerging at the opposite adrenal gland were higher. 14 patients (4.3% of the patients with regular follow-up) underwent surgery due to increase in size or development of new functionality during follow-up. Our study demonstrated that a necessity for surgery may arise due to increase in size and development of functionality during follow-up period in adrenal incidentaloma patients, and thus continuing patient follow-up, even with wider intervals, will be appropriate.

WFUMB position paper on the management incidental findings: adrenal incidentaloma

Focal lesions of the adrenal glands are incidentally detected in approximately 5% of cases by modern imaging techniques. Fewer than 5% of these adrenal incidentalomas are malignant and approximately 10% have endocrine activity. Reliable differentiation of malignant versus benign and hormonally active versus nonfunctional adrenal incidentalomas significantly influences therapeutic management and the outcome of affected individuals. Therefore, each adrenal incidentaloma should undergo a standardized diagnostic work-up to exclude malignancy and endocrine activity. This position statement of the World Federation of Ultrasound in Medicine and Biology (WFUMB) summarizes the available evidence on the management of adrenal incidentaloma and describes efficient management strategies with particular reference to the role of ultrasound techniques.