Systematic Search Patterns & Review-Area Checklists
A region-by-region search order for MRI reporting: what to check, on which sequence, and the blind spots that get missed. Use the same route on every case.
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Why a fixed search pattern beats “looking hard”BrainSpineKneeShoulderLiver / MRI AbdomenProstateMSK generic & the corners of the filmSourcesKey points
- Satisfaction of search, stopping after the first abnormality, is a recognised cause of a missed second finding; the habit taught here: finish the checklist after the lead finding, scroll every sequence edge-to-edge and always look at the corners of the film.
- Never sign a brain MRI without reviewing DWI/ADC: a subtle acute infarct can be invisible on T1, T2 and FLAIR early on.
- On spine MRI, look beyond the discs: review every vertebral body for a solitary T1-dark metastasis, state the conus level, check the first and last slices, and read the kidneys and aorta on the sagittals.
- Always trace a posterior labral tear to the spinoglenoid notch: a paralabral cyst there compresses the suprascapular nerve, causing isolated infraspinatus denervation, while one at the suprascapular notch denervates both supraspinatus and infraspinatus.
- On every prostate MRI, review the whole visualised skeleton on T1 and DWI: a T1-dark, diffusion-restricting focus is a metastasis until proven otherwise.
Explain it simply
- Finding one problem can make you stop looking and miss another. The habit taught here: finish the checklist after the first finding, scroll every series edge to edge, and check the image edges.
- Always check the diffusion scans before signing off a brain MRI. A small new stroke may not show on the other standard scans in its early stage.
- On spine scans, look beyond the discs: check every vertebra for a lone dark spot of cancer spread, say where the cord ends, check the first and last images, and look at the kidneys and main artery.
- If the cartilage rim at the back of the shoulder socket is torn, follow the tear to a nearby notch. A cyst there can pinch a nerve, affecting one shoulder muscle; a cyst higher up affects two.
- On every prostate scan, check all visible bones on the T1 and diffusion scans. A spot dark on T1 with restricted water movement is cancer spread until shown otherwise.
A guide only: follow your departmental protocols and regional requirements.
Why a fixed search pattern beats “looking hard”
Most missed findings in radiology are visible in retrospect (perceptual errors account for most misses; Bruno et al. 2015), and some lie in areas never searched. A radiologist who scans freely fixates on the obvious abnormality and never systematically covers the rest of the study. A fixed, exhaustive search pattern (the same route through the same structures on every case) converts perception from luck into method. It is a practical defence against the recognised cognitive error patterns below.
Satisfaction of search
Finding one abnormality and stopping. The second (often more important) finding is missed because the search terminated early. The classic MRI trap.
Inattentional blindness
Not perceiving an unexpected finding because attention was locked on the clinical question (“gorilla in the lung”).
Anchoring / premature closure
Committing to the first diagnosis and ceasing to weigh disconfirming evidence.
Framing / clinical-history bias
The referral steers the eye to one region so the rest of the field of view is under-searched.
Corners-of-the-film miss
Findings at the image edge, on the first/last slice, or in the “included but not the target” anatomy go unexamined.
Under-reading
An abnormality is fixated but dismissed or under-called. Deliberately name what you see before you interpret it.
A practical habit is to finish the checklist after you find the lead abnormality, scroll every sequence edge-to-edge and always look at the corners. Note that controlled studies (Berbaum et al., 2006 and 2016) found a checklist alone did not prevent satisfaction of search, so keep searching and keep reporting after the first finding.
Brain Neuro
Systematic search order
- Symmetry first: compare left vs right hemispheres, then descend cranial → caudal.
- Grey–white differentiation & cortex: ribbon, sulci, gyral pattern.
- Deep structures: basal ganglia, thalami, internal capsules.
- Ventricles & CSF spaces: size, symmetry, ependymal margins.
- Midline & posterior fossa: corpus callosum, brainstem, cerebellum, 4th ventricle.
- Then the review areas (below), the peripheral belt that the parenchymal search skips.
Key structures × sequence
| Structure | Best on | Looking for |
|---|---|---|
| Acute infarct | DWI + ADC | Restricted diffusion (bright DWI, dark ADC). Must-check on every brain. |
| Oedema / gliosis / demyelination | FLAIR | Periventricular & juxtacortical hyperintensity; sulcal FLAIR signal (SAH, meningitis). |
| Microbleeds / haemorrhage / calcium | SWI / GRE | Blooming foci: amyloid, cavernoma, DAI, haemorrhagic mets. |
| Enhancing lesion / breakdown | T1 post-Gd | Tumour, abscess rim, leptomeningeal & dural enhancement. |
| Anatomy / marrow / fat planes | T1 | Skull base marrow, clival signal, orbital fat. |
Review areas
Work the periphery structure by structure; these are the documented blind spots:
- Skull base & clivus: marrow replacement, chordoma, sphenoid lesions (T1).
- Cavernous sinuses: asymmetry, convexity, ICA flow voids, CN III–VI (coronal post-Gd).
- Internal auditory canals (IACs) & CPA: vestibular schwannoma, enhancement (thin post-Gd / heavily T2).
- Pituitary & sella: microadenoma, stalk position, height/convexity of gland.
- Extra-axial spaces: thin subdural/epidural collections that parallel the calvarium.
- Vessels & flow voids: absent flow void (thrombosis/occlusion), aneurysmal flow void, dural venous sinuses.
- Orbits & globes: optic nerves/sheaths, extra-ocular muscles, orbital apex.
- Paranasal sinuses & mastoid air cells: fluid, mucosal disease, opacification.
- Calvarium & scalp: lytic/blastic lesions, marrow signal, subgaleal collections.
- Cervicomedullary junction & foramen magnum: tonsillar position (Chiari), cord signal at the bottom slice.
Never sign a brain without eyeballing DWI/ADC. An acute infarct can be invisible on T1/T2/FLAIR in the first hours, and missing it can change management.
Tick-off checklist
Printable review list. Checkboxes reset on reload (no data stored).
Spine Neuro / MSK
Systematic search order
- Sagittal overview: count levels, assess alignment/curvature, then run top → bottom.
- Cord: calibre and signal end-to-end; identify the conus level (normally L1–L2).
- Vertebral marrow: sweep every body for focal replacement or diffuse change.
- Discs level by level: hydration, height, bulge/protrusion/extrusion.
- Facet joints & posterior elements: arthropathy, synovial cysts, pars.
- Canal & neural foramina: central and foraminal narrowing at each level (axials confirm).
- Paraspinal soft tissues: muscles, pre/paravertebral space.
- Incidental non-spinal anatomy: the corners of the film (below).
Key structures × sequence
| Structure | Best on | Looking for |
|---|---|---|
| Cord signal | Sag T2 / STIR | Myelomalacia, oedema, demyelination, cord expansion; confirm on axial. |
| Marrow disease | Sag T1 + STIR | Focal T1-dark replacement (mets, myeloma); STIR-bright oedema/fracture/infection. |
| Discs / degenerative | Sag & Ax T2 | Loss of hydration, herniation, annular fissure, Modic endplate change. |
| Canal & foramina | Ax T2 | Stenosis, root compression/impingement, lateral recess narrowing. |
| Infection / collection | STIR + post-Gd | Discitis-osteomyelitis, epidural abscess/phlegmon, endplate destruction. |
Review areas
Spine reports are dominated by discs; deliberately look away from them:
- Conus level & filum: is the cord low-lying (tethering)? State the conus level in the report.
- Every vertebral body: a solitary T1-dark marrow met is easy to skip when reading disc-to-disc.
- First & last slice of the stack: cervicomedullary junction on a C-spine top slice; sacrum below.
- Paraspinal / pre-vertebral soft tissue: mass, fluid, adenopathy.
Corners of the film on the sagittal. Included on almost every spine study: the kidneys (mass, hydronephrosis), the aorta (aneurysm, dissection flap), retroperitoneum and, on cervical/thoracic, the lung apices, thyroid and posterior mediastinum.
Tick-off checklist
Printable review list. Checkboxes reset on reload (no data stored).
Knee MSK
Systematic search order
- Menisci: medial then lateral, anterior horn → body → posterior horn on every sagittal slice; check coronals for roots.
- Cruciates: ACL (fibre continuity/angle) then PCL.
- Collateral ligaments & corners: MCL, LCL and the posterolateral corner structures.
- Extensor mechanism: quadriceps tendon, patella, patellar tendon, tibial tuberosity.
- Cartilage: patellofemoral, medial & lateral compartments.
- Bone marrow: oedema, contusion pattern, subchondral change, fractures.
- Synovium & recesses: plica, effusion, loose bodies, Baker cyst.
- Review areas: proximal tib-fib joint and popliteal fossa (below).
Key structures × sequence
| Structure | Best on | Looking for |
|---|---|---|
| Menisci | Sag & Cor PD/T2 FS | Signal clearly reaching an articular surface on at least two images (short-TE PD), or abnormal meniscal shape = tear; bucket-handle, root tear. |
| ACL / PCL | Sag (oblique) PD/T2 | Fibre discontinuity, abnormal angle/signal; secondary signs (pivot-shift bruise). |
| Collaterals | Cor T2 FS | Sprain grading, fluid, avulsion. |
| Cartilage | Ax & Sag PD/T2 FS | Fissuring, defects, delamination. |
| Bone marrow oedema | T2 FS / STIR | Contusion, stress/occult fracture, osteochondral lesion. |
Review areas
Everyone reads the menisci and ACL; the misses live at the edges:
- Proximal tibiofibular joint: corner of the coronal/axial FOV; ganglia, effusion, subluxation.
- Popliteal fossa: Baker cyst, popliteal artery aneurysm, soft-tissue mass, nerve pathology.
- Plica: mediopatellar plica as a cause of pain, best when effusion present.
- Extensor mechanism edges: quad/patellar tendon and tibial tuberosity on far sagittals.
- Bone lesions: scan the visualised femur/tibia/fibula marrow for an incidental lesion.
Tick-off checklist
Printable review list. Checkboxes reset on reload (no data stored).
Shoulder MSK
Systematic search order
- Rotator cuff tendons: supraspinatus, infraspinatus, subscapularis, teres minor; footprint, tears, retraction.
- Biceps: long head at the rotator interval and in the bicipital groove (subluxation/tear).
- Labrum: clock-face sweep on axials (± ABER/arthrogram); SLAP superiorly, Bankart antero-inferiorly.
- AC joint: arthropathy, capsular hypertrophy, cyst.
- Cartilage & glenohumeral joint: surfaces, effusion, loose bodies.
- Bone marrow: humeral head (Hill–Sachs), glenoid (bony Bankart), oedema.
- Review areas: spinoglenoid & suprascapular notches (below).
Key structures × sequence
| Structure | Best on | Looking for |
|---|---|---|
| Cuff tendons | Cor & Sag oblique T2 FS | Partial/full-thickness tear, tendinosis, retraction, muscle atrophy (Sag T1). |
| Labrum | Ax PD/T2 (± arthro) | Contrast/fluid undercutting labrum; SLAP, Bankart, ALPSA, Perthes. |
| Biceps LHB | Ax T2 FS | Empty groove (dislocation), tear, medial subluxation. |
| AC joint | Cor T2 FS | Osteoarthrosis, oedema, capsular/ganglion cyst. |
| Marrow | T1 + T2 FS | Hill–Sachs, bony Bankart, oedema, lesion. |
Review areas
The high-value shoulder blind spot is the paralabral cyst tracking to a notch:
- Spinoglenoid notch: paralabral cyst here compresses the suprascapular nerve → isolated infraspinatus denervation. Always trace a posterior labral tear to this notch.
- Suprascapular notch: a cyst/mass more proximally denervates both supraspinatus and infraspinatus.
- Muscle bulk / fatty atrophy: assess on the sagittal-oblique T1; predicts repair outcome.
- Quadrilateral space: axillary nerve, teres minor atrophy.
Tick-off checklist
Printable review list. Checkboxes reset on reload (no data stored).
Liver / MRI Abdomen Body
Systematic search order
- Liver by Couinaud segments: I–IV then V–VIII in order; do not free-scan. Characterise any lesion across all phases.
- Vessels: portal vein & branches (patency/thrombus), hepatic veins, IVC, hepatic artery.
- Biliary tree: intra/extrahepatic ducts, CBD, gallbladder (MRCP).
- Pancreas: head/uncinate → body → tail; duct; parenchymal signal.
- Adrenals: both glands; use in/opposed-phase for microscopic fat.
- Kidneys: parenchyma, collecting systems, any enhancing mass.
- Spleen: size, focal lesions.
- Nodes & peritoneum: porta hepatis, retroperitoneal, mesenteric; free fluid, deposits.
- Corners of the film: lung bases, bowel, bones, body wall.
Key structures × sequence
| Structure | Best on | Looking for |
|---|---|---|
| Focal liver lesion | Dynamic T1 post-Gd | Arterial/portal/delayed enhancement pattern; hepatobiliary phase (Eovist) uptake. |
| Diffuse fat / iron | In-/opposed-phase GRE | Signal drop on opposed-phase = fat; drop on the longer-TE echo (usually in-phase at 1.5 T; check the echo order at 3 T) = iron. |
| Cellularity / mets | DWI / ADC | Restricting deposits, small lesion detection. |
| Biliary / pancreatic duct | MRCP (heavy T2) | Stones, stricture, duct calibre, IPMN. |
| Adrenal nodule | Chemical-shift (in/opp) | Signal drop opposed-phase = intracellular lipid, strongly favouring adenoma (beware clear-cell RCC or HCC metastases); no drop is indeterminate. |
Review areas
After the liver lesion is characterised, do not stop; run the rest of the abdomen:
- Adrenals: always look at chemical-shift in/opposed-phase; adenoma vs met is a common miss.
- Portal & hepatic veins: bland vs tumour thrombus changes staging entirely.
- Pancreatic tail: easily under-scrutinised; small tumours hide here.
- Lung bases: nodules/effusions on the top slices.
- Bones: spine and pelvis marrow for a metastasis, reviewed on T1.
- Bowel & body wall: hernias, wall thickening, incidental masses.
Satisfaction-of-search hotspot. A striking HCC or metastasis pulls all attention; the second lesion, a vein thrombus, or an adrenal met is then missed. Finish the segment-by-segment and organ-by-organ list every time.
Tick-off checklist
Printable review list. Checkboxes reset on reload (no data stored).
Prostate Body / GU
Systematic search order (PI-RADS mindset)
- Peripheral zone (PZ): DWI/ADC is the dominant sequence. Sweep base → mid → apex, left & right.
- Transition zone (TZ): T2 is dominant; look for the “erased-charcoal” / lenticular non-encapsulated lesion.
- Dynamic contrast (DCE): used to upgrade an equivocal PZ (PI-RADS 3→4) focus.
- Capsule & extraprostatic extension: bulge, capsular abutment, neurovascular bundle.
- Seminal vesicles: invasion, T2 signal, symmetry.
- Nodes: obturator, iliac, presacral chains.
- Bones: the whole visualised skeleton (below).
Key structures × sequence
| Structure | Best on | Looking for |
|---|---|---|
| PZ tumour | DWI (high b) / ADC | Focal marked restriction; low ADC. Primary scoring sequence for PZ. |
| TZ tumour | T2 | Homogeneous low-T2, ill-defined, lenticular, absent capsule. |
| Equivocal upgrade | DCE T1 | Focal early enhancement to upgrade PI-RADS 3 PZ lesions. |
| Seminal vesicles / EPE | T2 | Low signal in SV, capsular breach, NVB involvement. |
| Bone metastasis | T1 + DWI | Focal T1-dark marrow replacement; restriction on DWI. |
Review areas
The prostate is scored meticulously, then the skeleton is forgotten:
- Review the whole visualised skeleton: pelvis, sacrum, proximal femora and lower lumbar spine on T1 (marrow) and DWI. A T1-dark, diffusion-restricting focus is a metastasis until proven otherwise.
- Nodes: obturator and iliac chains at the edge of the small-FOV axials.
- Bladder & rectum: wall lesions incidentally included.
- Seminal vesicle & apex/base extremes: the first and last few slices where the gland tapers.
Look at the bones on T1 and DWI, every prostate MRI. A missed marrow metastasis in a patient worked up for localised disease is a high-consequence corners-of-the-film error.
Tick-off checklist
Printable review list. Checkboxes reset on reload (no data stored).
MSK generic & the corners of the film Principle
A universal MSK search order (any joint)
- Bones & marrow: signal on T1 (replacement) and fluid-sensitive (oedema/fracture) before soft tissue distracts you.
- Cartilage: articular surfaces on fluid-sensitive fat-sat.
- Ligaments & tendons: trace each to its attachment; continuity and signal.
- Fibrocartilage: menisci / labrum / TFCC as relevant.
- Joint & synovium: effusion, loose bodies, synovial disease.
- Muscles & neurovascular: bulk, oedema, denervation pattern, mass.
- Then the corners: the far slices and the anatomy included “for free”.
“Don’t forget the corners of the film”
A habit that transfers to every study. The corners of the film are where unsearched findings live because the eye is drawn to the centre and to the clinical question. Deliberately, on every study:
- Scroll to the first and last slice of every sequence: findings at the edge of the acquired volume.
- Look at the image periphery: soft-tissue masses, skin lesions, foreign bodies, fluid at the FOV edge.
- Read the “included but not the target” anatomy: lung apices on a shoulder, kidneys/aorta on a spine, lung bases on an abdomen, bowel on a hip.
- Review every sequence, not just the diagnostic one: the localiser and each fat-sat/T1 pairing catch different pathology.
- Finish the checklist after the lead finding: a practical habit against satisfaction of search, though a checklist alone did not prevent it in controlled studies (Berbaum et al. 2006, 2016).
The habit, stated plainly: same route every case → name what you see before interpreting → keep searching after the first abnormality → always look at the corners. Systematic beats clever.
Tick-off checklist
Printable review list. Checkboxes reset on reload (no data stored).
Sources
Key references: Bruno, Walker & Abujudeh, “Understanding and Confronting Our Mistakes: The Epidemiology of Error in Radiology,” RadioGraphics 2015;35:1668–1676. Berlin, “Radiologic Errors, Past, Present and Future,” Diagnosis 2014. Kim & Mansfield, “Fool Me Twice: Delayed Diagnoses in Radiology,” AJR 2014;202:465–470. Turkbey et al., “PI-RADS Version 2.1,” Eur Urol 2019;76:340–351. Drew, Võ & Wolfe, “The Invisible Gorilla Strikes Again,” Psychol Sci 2013;24:1848–1853. Standard texts: Osborn Diagnostic Imaging: Brain; Manaster Diagnostic Imaging: MSK; Federle Diagnostic Imaging: Abdomen; Radiopaedia.
Educational search-pattern aid for trainees, not a substitute for local reporting protocols or structured reporting templates (e.g. PI-RADS v2.1).
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