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Difficulty: MediumBreast and Endocrine Surgery

A 48-year-old woman presents to the clinic with progressive weight gain, facial plethora, and easy bruising over the past year. Examination reveals central adiposity, prominent violaceous abdominal striae, and proximal muscle weakness. Her blood pressure is 155/95155/95 mmHg. Initial basic metabolic panel reveals mild hypokalemia. Arrange the following diagnostic and management steps in the most appropriate chronological sequence for this patient.

  1. 1Perform a 24-hour urine free cortisol or late-night salivary cortisol test
  2. 2Measure early morning plasma adrenocorticotropic hormone (ACTH) concentration
  3. 3Obtain a dedicated computed tomography (CT) scan of the abdomen
  4. 4Perform a unilateral laparoscopic adrenalectomy
  5. 5Initiate a gradual postoperative glucocorticoid tapering regimen

Answer

The correct sequence is: confirm hypercortisolism (urine free cortisol), determine ACTH dependence (plasma ACTH), localize the lesion (abdominal CT), perform definitive treatment (laparoscopic adrenalectomy), and manage adrenal suppression (postoperative glucocorticoid taper).
The diagnostic and surgical management of Cushing syndrome follows a strict algorithm to avoid diagnostic errors and perioperative morbidity. Step 1 is establishing the presence of hypercortisolism (e.g., 24-hour urine free cortisol). Step 2 is measuring ACTH to determine the source; suppressed ACTH indicates a primary adrenal issue. Step 3 is anatomical localization using an abdominal CT scan, which is only performed once biochemical evidence points to the adrenals. Step 4 is the definitive surgical resection (laparoscopic adrenalectomy). Step 5 is the critical postoperative initiation of a glucocorticoid taper to prevent acute adrenal insufficiency due to chronic suppression of the contralateral gland.

Step-by-Step Solution

1
Recognize the clinical presentation of Cushing syndrome.
Suspect endogenous hypercortisolism based on striae, central obesity, hypertension, and proximal weakness.
Clinical suspicion dictates the initiation of an endocrine workup rather than immediate imaging.
2
Select a primary screening test for hypercortisolism.
Order a 24-hour urine free cortisol, late-night salivary cortisol, or low-dose dexamethasone suppression test.
Hypercortisolism must be biochemically confirmed before localizing the source.
3
Determine the etiology by measuring ACTH.
Measure plasma ACTH level to identify if the process is ACTH-dependent or ACTH-independent.
A suppressed ACTH level points to an autonomous adrenal source, guiding the choice of anatomical imaging.
4
Localize the specific lesion.
Perform a CT scan of the abdomen.
Once an adrenal source is confirmed biochemically, imaging is used strictly for surgical planning.
5
Perform surgical intervention.
Execute a unilateral laparoscopic adrenalectomy.
Resection of the hyperfunctioning adenoma is the definitive treatment.
6
Provide crucial postoperative medical management.
Administer a tapering dose of glucocorticoids over several months.
The contralateral adrenal gland is suppressed by chronic hypercortisolism and cannot immediately produce sufficient cortisol, risking an acute adrenal crisis.

Key Concept

Algorithm for evaluation and surgical management of primary hypercortisolism (Cushing syndrome due to adrenal adenoma).
Estimated Time:1m 30s
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Topics

Breast and Endocrine Surgery

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