what is an adrenal incidentaloma? - endokrin cerrahisian adrenal incidentaloma is defined as an...
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Dimitrios Linos, M.D., Ph.D.
Professor of SurgeryNational & Kapodistrian University of Athens
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What is an adrenal incidentaloma?
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An adrenal incidentaloma is defined as an adrenaltumor initially diagnosed by imaging studies (CT,Ultrasound, MRI) for a clinical condition unrelated toadrenal disease.
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The term incidentaloma was first coined by Dr.Glenn Geelhoed in 1982 at the meeting of theAmerican Association of Endocrine Surgeons.
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Adrenaloma: a better term than incidentaloma
Linos DA: Surgery, 1989:105(3):456
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Clinically Inapparent Adrenal Mass
National Institute of Health, Vol 3, Bethesda, 2002
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How frequent?
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The overall frequency of adrenal adenomas in
87,065 autopsies in 25 studies was 5.9%.
Young WF, Endocrinol Metab Clin North Am, 2000;29(1)159-185
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At Mayo Clinic, in a 5-year period 61,054 patientsunderwent CT scanning.
In 2.066 (3.4%) patients, an adrenal abnormalitywas found.
Among these, 259 patients (12.5%) had anincidentaloma.
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In the era of widespread use of high-resolutionultrasonography, new generation CT scans andMRI, we can anticipate a 5% incidence ofincidentalomas.
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What is the Pathology?
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380 patients (Single Institution)
Non functioning adenoma 63% Subclinical cushing adenoma 15% Pheochromocytoma 7% Myelolipoma 6% Aldosteronoma 2% Carcinoma primary 4% Carcinoma metastatic 3%
Arnaldi G, Best Pract & Res Clin Endocr Metabol, 2012: 26(4), 405-419
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3088 compiled patients with Incidentaloma
Non Functioning adenoma 74%
Subclinical Cushing 7%
Pheochromocytoma 4.7%
Aldosteronoma 1.2%
Primary Adrenocortical Carcinoma 4.8%
Metastatic adrenal carcinoma 2.3%
Androulakis Il, Eur J Clin Invest 2011:41(5):552-560
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European Society of Endocrinology Clinical Practice Guidelines:
Management of patients with adrenal incidentalomas should involve a multidisciplinary team including endocrinologists, radiologists, surgeons and pathologists.
Imaging characteristics (specifically density on a non-contrast CT scan) is more important than the size of adrenal incidentalomas in determining risk of malignancy and indication for surgery.
Autonomous cortisol secretion is a disease on a continuum that is best assessed by a 1 mg dexamethasone suppression test. Surgical indication depends on the presence of comorbidities and severity of autonomous cortisolsecretion.
Laparoscopic adrenalectomy is the usual recommended approach when surgery is indicated. Open adrenalectomy is indicated for large or locally invasive tumours.
Small, non-secreting, benign-appearing adrenal tumours require no long-term follow-up.
QY Duh, Nature Reviews, Endocrinol, 148, Aug. 2016
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Rule out:
Function
Malignancy
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Although by definition incidentalomas are not“obviously” functioning tumors clinically apparent asCushing’s disease, Primary Aldosteronism,Pheochromocytoma, or sex steroid producingtumors, they should be evaluated for potential“subclinical” function.
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1.096 patients with adrenal incidentaloma:
9.2% had subclinical Cushing’s syndrome
4.2% had pheochromocytoma
1.6% had clinically unsuspected aldosteronomas
Mantero F, Horm Res, 1997;47:284-289
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An ill defined condition of altered phypothalamic-pituitary-adrenal axis secretion in patients who donot have the classical signs and symptoms ofclinically apparent Cushing’s syndrome.
Chiodini et al, J Clin Endocrinol Metab, 2010;95:2736-45
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Subclinical hypercortisolism: a state, a syndrome, or a disease?
Di Dalmazi G et al, Eur J Endocrinol, 2015;173(4):M61-71
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Adrenal Mild Hypercortisolism
Goddard GM, Endocrinol Metab Clin North Am. 2015;44(2):371-9
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2016 ESE-ENSAT Guidelines
Mild hypercortisolism as a disease continuum
Autonomous cortisol secretion (>138nmol/Lt)
Possible autonomous cortisol secretion (>50nmol/Lt)
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30% of patients with AI have mild increase in cortisol secretion.
Di Dalmazi G et al, Lancet, 2014;(2):396-405.
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Patients with SCS comprise between 0.2% to 2% inthe general population.
Chiodini I et al, J Clin Endocrinol Metab, 2010;95(6):2736-2745.
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1mg dexamethasone suppression test with thetraditional threshold of 5μg/dl or 138nmol/L todefine adequate suppression.
National Intuition of Health ed, Vol 3, Bethesda, 2002American Association of Clinical EndocrinologistsAmerican Association of Endocrine Surgeons
Screening for SCS
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A 2- or 3-mg dose is better than the usual 1-mg doseto reduce false-positive results.
A suppressed serum cortisol (<3μg/dL or 80 nmol/L)excludes Cushing’s syndrome.
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Adrenal scintigraphy with 131I-6β-iodomethylnorcholesterol (NP 59) can reveal a“functioning” but not “hypersecretory” tumor whenthere is an uptake of the nucleotide in the tumor siteand no-uptake in the contralateral suppressed gland.
Barzon L, J Clin Endocrinol Metab, 1998;83(1):55-62
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Patients with AI and SCS have:
Increased Mortality
Associated Comorbidities
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Patients with AI and post dexamethasone serum cortisol >1.8μg/dl have increased mortality, mainly related to cardiovascular disease and infection.
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Patients with adrenal incidentaloma and mildhypercortisolism have an increased risk ofcardiovascular events and mortality.
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ASSOCIATED COMORBIDITIES
Metabolic Syndrome
Cardiovascular Disease
Osteoporosis
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50 pts with AI (12/50 had SCS):
92% hypertension
50% obesity
42% type 2 diabetes mellitus
50% abnormal serum lipid concentrations
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The clinical and hormonal features improved inall patients treated by adrenalectomy but wereunchanged in all those who did not undergosurgery (follow up 9-73 months).
Interestingly, all 13 patients who had resection oftruly nonfunctioning adenomas because of largesize had improved clinically to such an extent thatantihypertensive and antidiabetic therapy wasreduced or discontinued.
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41 pts with AI (12 SCS) and compared them with 41controls.
Patients with these tumors (subclinicallyfunctioning or nonfunctioning) display somefeatures of the metabolic syndrome such asimpaired glucose tolerance, increased bloodpressure and high triglyceride levels.
Terzolo M et al, Clin Endocrinol (Oxf), 1998;48:89-97.
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180 patients with AI:
Surgery in: 25pts with SH No surgery in: 16pts with SH
30pts without SH 37pts without SH
Patients with SH treated with surgery had improvement in weight (32%), blood pressure (56%) and glucoses levels (48%).
Patients with SH non-treated BP, Glucose and LDL levels worsened more frequently than the ones treated surgically.
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20 pts operated 15 pts non operated
The operated pts had: Normalization of laboratory corticosteroid parameter Decrease in BP(53%) Glymetabolic control improved (50%) BMI decreased Improvement of SF-36 evaluation
The Non-operated pts had: No improvement Worsening
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60 pts with AI but no Diabetes, Hypertension,
Hyperlipidemia
32 healthy controls with normal adrenal imaging
Ultrasonographic measurement of carotid intima-media
thickness (IMT) and flow-mediated dilatation (FMD)
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26 pts had Cortisol Secreting AI
34 pts had Non Functioning AI
Patients with cortisol secreting adrenalincidentaloma without hypertension, diabetes,dyslipidemia exhibit adverse metabolic and CVRfactors
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35 pts NFA 35 controls
Even patients with nonfunctioning AI also had lessflow-mediated vasodilation compared with controls.
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24 women with AI divided into two groups on thebasis of the median value of urinary cortisol excretion.
The group with higher cortisol values (subclinicalCushing levels) had more lumbar trabecular boneloss than those with low cortisol secretion (nothypersecreting tumors).
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Multicenter, retrospective study 287 patients with AI(85 had SCS)
Patients with SCS had lower bone mineral density,increased spinal deformity index compared with bothAI nonfunctioning and controls.
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Nine hospitals in S. Sweden
223 pts with AI
Unilateral 180 76 (42%) had SH
Bilateral 43 30 (70%) had SH
Subclinical hypercortisolism is more common in bilateral AIs
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BAI patients present more often with SCS whencompared with UAI patients.
However comorbidities were of similar frequency inboth groups.
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Non Functioning AI are not necessarily evolving to functional , but An increased prevalence of CV and Metabolic Risk Factors has been described in pts with NFAI
Due to: A mild cortisol excess that cannot be detected with the available diagnostic test Periodic secretion
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75 patients (median follow up 4 years)
The estimated cumulative risks for mass enlargementand hyperfunction were 18% and 9.5% respectivelyafter 5 years, and 22.8% and 9.5% after 10 years.
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53 patients with incidentalomas followed for 6-78months.
22 lesions (41.5%) increased in size and 6 lesions(11.3%) decreased in size or disappeared.
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77 patients with adrenal incidentaloma followed for amedium follow-up of 60 months using annualhormonal and CT evaluation.
A proportion of the non functioning incidentalomasdeveloped overt hyperfunction.
Increase in size was not uncommon.
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The totally asymptomatic incidentaloma thathistologically proves to be a pheochromocytoma.
Measurement of catecholamines and theirmetabolites (metanephrines) in plasma and/or urine.
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There is no indication for routine use of 131I-meta-iodobenzylguanidine (I-MIBG) scintigraphy in theevaluation of an incidentaloma unless catecholamineand urinary metabolites are elevated.
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Prophylactic measures should always be taken(e.g., arterial line, immediate access tointravenous nipride) during surgery.
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More than 40% of patients with primaryaldosteronism are normokalemic.
The previously recommended measurement ofpotassium as the only test to rule out primaryaldosteronism in the case of incidentaloma should beabandoned.
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In a normotensive patient with a serum potassium levelgreater than 3.9 nmol/L, no further hormonalevaluation is necessary.
A detailed time-consuming evaluation is necessary,especially in all hypertensive patients, to rule outprimary aldosteronism which may be the cause ofhypertension in up to 15% of these patients.
The screening for subclinical primary aldosteronismshould include, in addition to serum potassium, theupright aldosterone level to plasma renin activity(PRA) ratio.
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Patients with two or more samples positivealdosterone/PRA ratio (>40) should undergo thefluorocortisone suppression test (0.4 mg every dayfor 4 days).
The acute saline suppression test (2L of 0.9% NaClsolution infused intravenously in 4 hours) to confirmthe diagnosis.
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Bilateral adrenal venous sampling withmeasurements of aldosterone and cortisol levels isthe necessary next step to lateralize, determine thesubtype of primary aldosteronism in order toidentify the patient who will be cured throughsurgery.
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Adrenal Incindentaloma:
Primary carcinoma 5%
Metastatic carcinoma 3%
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In addition to assessing distant metastasis and tumorsize, imaging studies may suggest malignancy.
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CT
A poorly delineated ragged tumor with stippledcalcifications and with areas of necrosis.
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CT
Attention value
≤10 Hounsfield units probably a benign tumor
>10 Hounsfield units …… suspicious
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MRI
Heterogeneously increased, early T2-weightedsignal, weak and late enhancement aftergadolinium injection or an intravascular signalidentical to the tumor signal.
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The 18 F-FDG-PET-scan is a useful tool confirmingisolated metastases and selecting patients foradrenalectomy.
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Fine-needle aspiration (FNA) biopsy of anincidentaloma has a limited role.
FNA cannot differentiate cortical adenoma fromcarcinoma because it cannot detect invasion of thetumor into the capsule.
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Although most clinically treated adrenal malignanciesare discovered when they are larger than 6 cm indiameter, several reports have described very largetumors that never metastasized and small adrenaltumors that proved malignant.
> 6cm
> 4cm Indication for surgery
> 3cm
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The size of an incidentaloma as reported on a CTscan is usually less than the size reported on thehistology report.
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The regression line (y=0.85 +1.09x) relating CT-estimatedand histological tumor size waslinear (r=0.90, P<.001).
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The Linos formula turned out to besignificantly more accurate thandirect radiologic measurements whenmeans of the groups were compared,whereas when individual correlationswere determined the two weresimilar. The Linos formula andradiologic measurements can be usedto determine the propermanagement of adrenalincidentalomas in individual patients.
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Currently, the only accepted criteria to determinewhether an incidentaloma is benign or malignant aremetastasis (synchronous or metachronous) and localinvasion into adjacent structures.
The mapping and identification of genes responsible forhereditary syndromes (e.g. multiple endocrineneoplasia type 1, Li-Fraumeni) have increased ourunderstanding of adrenocortical tumorigenesis.
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Laparoscopic adrenalectomy
Posterior retroperitoneoscopic adrenalectomy
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Open adrenalectomy should be reserved for verylarge adrenal carcinomas invading the surroundingtissue.
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Suspicious AI for malignancy
43 patients with Stage I and II ACC (25 patients openadrenalectomy and 18 laparoscopic).
Recurrence rate, median recurrence free survival,overall survival did not differ between the two groups.
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The German ACC Registry published their resultson 152 patients with Stage I and II tumors less than10cm in diameter. 35 had undergone laparoscopicand 117 open adrenalectomy.
Disease-specified survival as well as recurrencefree survival, frequency of tumor capsuleviolation and postoperative peritonealcarcinomatosis were not different between thetwo groups.
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156 patients with stage I and II adrenocorticalcarcinoma. (30 laparoscopic and 126 openadrenalectomy).
No significant differences were found between thetwo groups in terms of 5 year disease free survivaland 5 year overall survival rates.
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The most important factor for the success of anyadrenalectomy, especially for tumors suspicious forcarcinoma is the experience of the surgeon on howto approach the adrenal tumors. This is true foreither open or laparoscopic adrenalectomy.
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The authors suggest thatthe retroperitoneoscopicapproach should becomethe method of choice inminimally invasiveadrenal surgery.
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170 pts with clinical (n=99) and subclinical (n=71)Cushing’s syndrome.
There were no mortalities or major complicationsreported.
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183 pts with Conn’s syndrome
The retroperitoneoscopic approach provided a timeefficient and safe surgical approach.
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PRA resulted in decreased operative times, bloodloss and postoperative length of stay compared withLA.
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Most endocrinologists treat this
Adrenal Incidentaloma Discovered Serendipitously
Conservatively……….
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But …..
The Increased Mortality of pts with AI
The Associated Comorbidities (Metabolic Sx, CVR Factor, Osteoporosis) frequently followed by significant improvement after surgery
The safety of endoscopic adrenalectomy
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Evidence for a subclinically functioning tumor (mildhypercortisolism)
Associated comorbidities (hypertension, obesity,diabetes, osteoporosis, etc)
Size >4cm
Age
Radiological suspicion (CT>10HU)
Surgical management:
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No clinical or laboratory evidence for subclinical function of the tumor.
No associated comorbidities potentially related to the incidentaloma.
No suspicion of adrenal carcinoma.
Conservative management:
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The low risk ofadrenalectomyespecially via thelaparoscopic approachcan provide an earlydefinitive diagnosis andtreatment
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Thank you!