dromlakhani Perform imaging at least 12 weeks after surgery
STEP 1 — Gather Information
Confirm date of transsphenoidal surgery, verify that at least 12 weeks have elapsed, and assess for MRI contraindications (e.g., pacemaker, ferromagnetic implants, severe claustrophobia).
STEP 2 — Rule In / Rule Out
If ≥12 weeks post‑surgery, proceed to step 3; if <12 weeks, delay imaging until the 12‑week mark.
STEP 3 — Classify or Stratify
If MRI is not contraindicated and is available, select MRI pituitary protocol; if MRI is contraindicated or unavailable, select CT of the sella with thin‑section cuts.
STEP 4 — Decide
Order the chosen imaging study to evaluate for residual tumor and parasellar extension.
Clinical Guardrails / Mimics / Pitfalls
Do not obtain imaging earlier than 12 weeks because postoperative gel foam, fat packing, and edema can mimic residual tumor; avoid relying on CT when MRI is feasible due to inferior soft‑tissue contrast; screen for MRI safety hazards before scheduling.
Concrete Clinical Example
A 48‑year‑old woman had endoscopic transsphenoidal resection of a GH‑secreting macroadenoma on March 10. On June 15 (≥12 weeks later) with no MRI contraindications, a dedicated pituitary MRI is performed, showing no residual enhancing lesion.
Source: Acromegaly: An Endocrine Society Clinical Practice Guideline, Endocrine Society, 2014, DOI:10.1210/jc.2014-2700