ABPN Neurology common mistakes
ABPN Neurology · Understand the traps and how to avoid them.
On localization items, committing to a single lesion site after the first localizing sign and then discounting later vignette findings that do not fit that site, instead of listing every finding's level and eliminating incompatible sites.
Board items deliberately pair findings that co-localize at only one level (e.g., a cranial nerve sign plus a long-tract sign). Candidates pattern-match the most familiar sign and stop reasoning, so the second finding is treated as noise.
What to do instead
Before answering, write a one-line findings-to-levels table: each finding, its neuroaxis level, and whether the deficit is crossed or uncrossed. Eliminate any site that cannot explain the full combination, then choose the single site explaining the most findings.
Selecting IV thrombolysis or thrombectomy for acute ischemic stroke from elapsed time alone, without checking the vignette's specific eligibility variables (last known well versus witnessed onset, NIHSS, glucose, blood pressure, CT/CTA findings, anticoagulation).
Time-window heuristics are overlearned and feel sufficient. Exam vignettes typically bury a disqualifier such as glucose 40 mg/dL, BP 195/115, recent surgery, or a large established infarct after a tempting time stamp.
What to do instead
Apply a fixed six-item checklist to every acute stroke item: exact onset/last known well, NIHSS, glucose, blood pressure, imaging findings, and contraindications. Only after all six are stated should reperfusion therapy be chosen.
Reading EEG patterns by morphology alone, labeling rhythmic delta or theta as ictal, or dismissing generalized periodic discharges, without checking evolution in frequency, amplitude, or field and without asking about a clinical correlate.
Teaching emphasizes recognition of classic seizure patterns, so static encephalopathic patterns and artifacts (sweat, EKG, eye movement) are mistaken for ictal activity, and nonconvulsive status is missed when evolution is subtle.
What to do instead
For every EEG item, explicitly answer three questions before classifying: does the pattern evolve in frequency, morphology, or field; is there a clinical correlate; and does it change with activation or medication? If it does not evolve and has no correlate, call it an encephalopathic pattern rather than a seizure.
Assigning a dementia diagnosis, usually Alzheimer disease, before excluding depression, medication effects, sleep apnea, B12/TSH abnormalities, and before characterizing the leading cognitive domain and behavioral features.
Alzheimer disease is the most familiar label, and vignettes containing apathy, word-finding pauses, or personality change are prematurely forced into it, missing behavioral-variant frontotemporal dementia, Lewy body disease, or a reversible contributor.
What to do instead
Use a three-step frame: list reversible or contributing factors; identify the leading domain (memory versus language versus executive/behavior versus visuospatial); then match the imaging pattern. Diagnose the syndrome first and the etiology second.
Accepting the patient's own headache label (sinus, tension, stress) and treating the vignette as a primary headache without screening for SNOOP red flags or counting acute medication days per month.
A benign-sounding history and a familiar patient label anchor the candidate. Item writers insert one red flag, such as new onset after age 50, thunderclap onset, positional worsening, papilledema, or medication overuse, and the label overrides it.
What to do instead
Run a SNOOP4 screen (systemic symptoms, neurologic signs, onset sudden, older age, pattern change) on every headache item, and tally acute analgesic or triptan days per month before selecting a diagnosis or treatment.
Interpreting nerve conduction and EMG data from single numbers (for example, equating a prolonged distal latency with demyelination) rather than assembling the whole pattern: which nerves are affected, sensory versus motor, uniform versus nonuniform, and whether recruitment is reduced.
Candidates memorize threshold values but skip pattern recognition, so axonal versus demyelinating, myopathic versus neuropathic, and neuromuscular junction disorders are misclassified when one abnormal number is present.
What to do instead
State the pattern in one sentence before matching a disease: axonal versus demyelinating, symmetric versus asymmetric, sensory/motor/both, and whether decrement or early recruitment is present. Only then choose the diagnosis.
Classifying tremor or parkinsonism from the patient's description or a single feature without assessing activation condition (rest, postural, kinetic, task-specific), frequency, symmetry, alcohol response, and drug or toxin exposure.
Essential tremor and Parkinson disease overlap heavily in vignettes, and drug-induced parkinsonism is underweighted even though antipsychotics, metoclopramide, and valproate are common culprits.
What to do instead
Build a tremor table on the scratch sheet: rest versus postural versus kinetic versus task-specific, symmetry, alcohol response, and full medication list. For parkinsonism under age 50, add ceruloplasmin and Wilson disease screening before labeling it idiopathic.
Applying McDonald dissemination-in-space and dissemination-in-time criteria to a first demyelinating attack without confirming that lesions are morphologically typical (periventricular, juxtacortical, infratentorial, spinal cord) and without excluding alternative diagnoses such as migraine, small vessel disease, or vasculitis.
The heuristic that white matter lesions equal multiple sclerosis is strong, yet age-related changes and migraine-related foci are common and do not satisfy typical lesion morphology.
What to do instead
Before diagnosing multiple sclerosis, require typical lesion morphology and document a negative alternative-diagnosis screen (B12, ANA, infectious serologies, vascular risk factors). Explicitly state which lesions satisfy dissemination in space and time.
Missing the localization implied by a pupil-involving third nerve palsy or by monocular visual loss with a normal fundus, and proceeding to diagnose migraine or dry eye instead.
The accompanying headache or eye pain draws attention, while the pupil finding or afferent pupillary defect is described discreetly; candidates examine the symptom rather than the sign.
What to do instead
For any ptosis or diplopia item, check pupil and eye movements first, and treat a pupil-involving third nerve palsy as a compressive aneurysm until imaging excludes it. For visual loss, always test color vision, the afferent pupillary defect, and fundoscopy before naming a diagnosis.
Applying adult thresholds and workups to pediatric items, such as ordering a full sepsis evaluation for a simple febrile seizure or using adult Glasgow Coma Scale and concussion return criteria for a child, without adjusting for age-specific norms and decision rules.
Adult neurology training dominates, but pediatric norms for milestones, neonatal seizure semiology, and validated rules such as PECARN differ and are tested directly.
What to do instead
For every pediatric item, first state the age and whether the presentation is age-appropriate. Then apply the pediatric-specific rule (PECARN, simple febrile seizure criteria, neonatal EEG). For toxic/metabolic items, calculate the anion gap and osmolality before choosing a treatment.