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Postoperative Brain Reporting: Answer the Surgeon's Question

Fellowship-level neuroradiology teaching by E. Brooke Schrickel, MD. Open this topic in the interactive reading room →

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Core clinical idea

On a post-op scan the surgeon already knows what they did — your job is to answer their question, not run a generic search: did anything bleed, is there mass effect or herniation, is the cavity what they expect, and are the expected post-op changes (blood products, pneumocephalus, smooth marginal enhancement) within the normal time course or tipping into a complication. Read it against the operation and the clock.

Bottom line

Read the post-op scan against the operation and the timeline — separate expected post-op change from the complication the surgeon is actually calling about: hemorrhage, ischemia, mass effect, infection, or CSF problem.

Core workstation questions

  • What operation was done, and how long ago — the timeline reframes whether a finding is expected or a complication?
  • Is there new or expanding hemorrhage at the operative site, or remote (including remote cerebellar hemorrhage after supratentorial surgery)?
  • Is there mass effect, midline shift, herniation, or a trapped/entrapped ventricle that needs action now?
  • Is the enhancement expected (thin, smooth, linear dural/marginal) or nodular (residual or recurrent tumor)?
  • For tumor resection, is this the early post-op MRI (within ~24-48 h) needed to define residual disease before reactive enhancement confounds it?
  • Is there a CSF problem — hydrocephalus, leak, or tension pneumocephalus?

What changes reporting / management

  • For tumor resection, get the MRI within ~24-48 h: beyond that window reactive enhancement appears and mimics residual tumor, so residual disease can no longer be cleanly defined.
  • Distinguish expected thin, smooth dural/marginal enhancement from nodular enhancement that should be read as residual or recurrent tumor.
  • Report hemorrhage into the resection cavity, remote cerebellar hemorrhage, and venous infarct if a vein or dural sinus was sacrificed.
  • Treat tension pneumocephalus (the Mount Fuji sign — air separating and compressing both frontal lobes) as a surgical emergency, not an incidental finding.
  • State the position of any EVD/shunt catheter and look along its tract for hemorrhage; note peri-cavity DWI restriction, which is expected but will enhance on later scans and must not be re-called as tumor.

Practical traps

  • Calling reactive post-op enhancement 'residual tumor' once you are past the early (~24-48 h) window.
  • Missing a small subdural or epidural collection, or a remote cerebellar hemorrhage, while focused on the cavity.
  • Re-reading expected peri-resection DWI-bright tissue (which later enhances) as new tumor on follow-up.
  • Reporting without stating the operation and the timeline, so the reader can't tell expected change from complication.

Teaching pearls

  • Early post-op MRI (~24-48 h) defines residual tumor before reactive enhancement sets in — after that you usually can't tell.
  • Thin and smooth dural enhancement is expected; nodular enhancement is residual/recurrent until proven otherwise.
  • Peri-resection restricted diffusion is expected and will enhance weeks later — don't call that enhancement tumor.
  • Mount Fuji sign = tension pneumocephalus = surgical emergency.
  • Answer the surgeon's four questions: bleed, ischemia, mass effect, residual.

Teaching visuals

Post-op head CT / brain MRI: the report the surgeon needsThey know what they did & when — read the scan against the OPERATION and the CLOCK, and answer their question.1 · Frame itAlways state the operation + how long ago.The timeline reframes whether a finding isexpected or a complication.OPERATION+ CLOCK2 · The surgeon’s 4 questions1 · BLEED?New / expanding hemorrhageat the site — or remote.2 · ISCHEMIA?Arterial or venous infarct(esp. if a vein/sinus was cut).3 · MASS EFFECT?Midline shift, herniation,trapped ventricle.4 · RESIDUAL?Tumor left behind — is anyenhancing tissue nodular?3 · Expected vs complicationEarly MRI ~24–48 h defines residual tumorBEFORE reactive enhancement sets in; afterthat window you usually can’t tell.Thin, smooth rim = EXPECTED.NODULAR enhancement = residual / recurrent.Peri-cavity restricted diffusion isEXPECTED & will enhance later — don’tre-call that as tumor.EXPECTEDRESIDUALSmooth rim (left) vs nodular rim (right): thelump along the cavity wall is what gets called.4 · Can’t-miss — surgical emergenciesMOUNT FUJIair splits frontal lobesTension pneumocephalus= Mount Fuji sign; air compressesboth frontal lobes — emergency.• Remote cerebellar hemorrhage• Venous infarct after vein/sinus cut• Hemorrhage along an EVD / shuntcatheter tractBottom lineRead it against the operation & the clock. Answer fourthings: bleed, ischemia, mass effect, residual.Timeline figures approximate; protocols vary by institution.
Postoperative CT/MRI — Report for the Surgeon

Source lectures

  • Postoperative CT Head & MRI Brain Reporting

Educational material for radiology residents and neuroradiology fellows. Nothing here drives individual patient care, and it contains no patient data.