Transsphenoidal Selective Adenomectomy by Experienced Pituitary Surgeon for Cushing's Disease
STEP 1 — Gather Information
Confirm diagnosis of Cushing's disease: elevated 24‑h UFC or late‑night salivary cortisol, nonsuppressible cortisol after dexamethasone, elevated or nonsuppressed ACTH, and pituitary MRI identifying an adenoma. Assess surgical candidacy (no uncontrolled comorbidities, anesthesia risk acceptable) and verify availability of an experienced pituitary surgeon.
STEP 2 — Rule In / Rule Out
Is the patient a surgical candidate for transsphenoidal surgery? If yes, proceed to TSS; if not, consider second‑line options (medical therapy, bilateral adrenalectomy, or radiation).
STEP 3 — Classify or Stratify
Stratify by tumor size on MRI: microadenoma (<10 mm) vs macroadenoma (≥10 mm). This guides expectations for remission rates and need for adjunctive therapy.
STEP 4 — Decide
For microadenoma, proceed with TSS alone; for macroadenoma, perform TSS by an experienced surgeon and plan close postoperative monitoring with early repeat imaging or consideration of adjuvant therapy if residual tumor is suspected.
Clinical Guardrails / Mimics / Pitfalls
Ensure surgeon has high volume of pituitary cases; avoid TSS if ectopic ACTH source is suspected (e.g., occult tumor on imaging). Monitor serum sodium daily for 5‑14 days postop to detect hyponatremia/DI, watch for hemorrhage or meningitis, and assess for transient hypopituitarism. Obtain postoperative MRI within 1–3 months to establish a baseline for recurrence surveillance.
Concrete Clinical Example
A 28‑year‑old woman presents with weight gain, hypertension, and wide purple striae. UFC is 450 µg/24 h (5× ULN), late‑night salivary cortisol elevated, ACTH 45 pg/mL, and pituitary MRI shows a 7 mm microadenoma. She is deemed a surgical candidate and undergoes TSS by an experienced pituitary surgeon. Post‑op day 3 serum sodium is 138 mmol/L, day 7 UFC normal, morning cortisol low. Post‑op MRI at 6 weeks shows no residual tumor; she is in remission.
Source: Treatment of Cushing’s Syndrome: An Endocrine Society Clinical Practice Guideline, Endocrine Society, 2015, DOI:10.1210/jc.2015-1818