Daily Testing Log

GEMINI IMAGE ACCURACY AUDIT: All 68 synthetic slide images sent to Google Gemini API (gemini-2.5-flash) for medical accuracy analysis. Results: 53 images rated INACCURATE, 15 rated PARTIALLY_ACCURATE, 0 rated ACCURATE. Common issues: incorrect tissue architecture, missing pathognomonic features, wrong cell types, non-representative morphology. All 68 synthetic images regenerated with medically accurate prompts informed by Gemini's specific feedback. Two user-provided real H&E images preserved unchanged: Glioblastoma and Astrocytoma IDH-mutant Grade 2.

Meningioma — Gemini rated PARTIALLY_ACCURATE. Regenerated with correct whorl patterns, psammoma bodies, and intranuclear pseudoinclusions.

Alzheimer Disease — Gemini rated INACCURATE. Regenerated with neuritic plaques (amyloid cores), flame-shaped NFTs, and proper H&E cortical architecture.

Multiple Sclerosis – H&E — Gemini rated INACCURATE. Regenerated with sharp demyelinated plaque border, foamy macrophages, and perivascular cuffing.

Schwannoma — Gemini rated PARTIALLY_ACCURATE. Regenerated with Verocay bodies, Antoni A/B biphasic pattern, and hyalinized vessels.

Medulloblastoma — Gemini rated PARTIALLY_ACCURATE. Regenerated with small round blue cells, Homer-Wright rosettes, and high mitotic rate.

Ependymoma — Gemini rated INACCURATE. Regenerated with perivascular pseudorosettes, anuclear fibrillary zones, and true ependymal rosettes.

Pilocytic Astrocytoma — Gemini rated INACCURATE. Regenerated with biphasic architecture, Rosenthal fibers, and eosinophilic granular bodies.

Cerebral Infarction — Gemini rated INACCURATE. Regenerated with red neurons, neuropil vacuolation, and neutrophil infiltration.

Viral Encephalitis — Gemini rated INACCURATE. Regenerated with perivascular cuffing, microglial nodules, and neuronophagia.

Oligodendroglioma — Gemini rated PARTIALLY_ACCURATE. Regenerated with fried-egg cells, chicken-wire vasculature, and calcifications.

Astrocytoma IDH-mutant Grade 3 — Gemini rated INACCURATE. Regenerated with nuclear atypia, mitotic figures, and fibrillary astrocytic processes.

ATRT — Gemini rated PARTIALLY_ACCURATE. Regenerated with rhabdoid cells, eccentric nuclei, and heterogeneous cell population.

Neurofibroma — Gemini rated INACCURATE. Regenerated with wavy serpentine nuclei, myxoid-collagenous stroma, and mast cells.

Intracerebral Hemorrhage — Gemini rated INACCURATE. Regenerated with RBCs dissecting brain tissue and hemosiderin-laden macrophages.

Bacterial Meningitis — Gemini rated INACCURATE. Regenerated with neutrophilic subarachnoid exudate and meningeal inflammation.

HSV Encephalitis — Gemini rated INACCURATE. Regenerated with Cowdry type A inclusions and hemorrhagic necrotizing inflammation.

Cryptococcal Meningitis — Gemini rated PARTIALLY_ACCURATE. Regenerated with soap-bubble yeast forms and Virchow-Robin space distension.

Toxoplasmosis — Gemini rated INACCURATE. Regenerated with tachyzoites, bradyzoite cysts in brain tissue (not testicular tissue).

Tuberculous Meningitis — Gemini rated INACCURATE. Regenerated with caseating granulomas, Langhans giant cells, and meningeal involvement.

ADEM — Gemini rated INACCURATE. Regenerated with perivenous demyelination sleeves and inflammatory infiltrates.

Parkinson Disease — Gemini rated INACCURATE. Regenerated with classic Lewy body (eosinophilic core + pale halo) in pigmented neuron.

ALS — Gemini rated INACCURATE. Regenerated with anterior horn cell loss, Bunina bodies, and lateral column pallor.

CJD — Gemini rated INACCURATE. Regenerated with spongiform vacuoles in gray matter neuropil and absent inflammation.

Cavernous Angioma — Gemini rated INACCURATE. Regenerated with back-to-back thin-walled vascular channels and hemosiderin.

Oligodendroglioma Grade 3 — Gemini rated INACCURATE. Regenerated with increased cellularity, mitoses, and microvascular proliferation.

Myxopapillary Ependymoma — Gemini rated PARTIALLY_ACCURATE. Regenerated with papillary architecture and myxoid mucin-rich cores.

Multiple Sclerosis – LFB — Gemini rated INACCURATE. Regenerated with LFB-positive myelin loss and sharp plaque boundaries.

Neuromyelitis Optica — Gemini rated INACCURATE. Regenerated with perivascular eosinophils and astrocyte loss.

PML — Gemini rated INACCURATE. Regenerated with ground-glass oligodendrocyte nuclei and bizarre astrocytes.

CMV Encephalitis — Gemini rated INACCURATE. Regenerated with pathognomonic owl's eye inclusions.

SSPE — Gemini rated PARTIALLY_ACCURATE. Regenerated with Cowdry type B inclusions and perivascular inflammation.

Cerebral Abscess — Gemini rated INACCURATE. Regenerated with necrotic center, granulation tissue capsule, and reactive gliosis.

Naegleria (PAM) — Gemini rated INACCURATE. Regenerated with amoebic trophozoites and hemorrhagic meningoencephalitis.

Metastatic Carcinoma — Gemini rated INACCURATE. Regenerated with well-demarcated tumor nodule and pushing border.

Chronic Ischemic Stroke — Gemini rated INACCURATE. Regenerated with cystic cavity, gliosis, and macrophage cleanup.

Subarachnoid Hemorrhage — Gemini rated INACCURATE. Regenerated with blood in subarachnoid space and hemosiderin-laden macrophages.

Epidural Hematoma — Gemini rated INACCURATE. Regenerated with organized blood clot and dural compression.

Subdural Hematoma — Gemini rated INACCURATE. Regenerated with neomembranes, granulation tissue, and hemosiderin macrophages.

Spinal Cord Injury — Gemini rated INACCURATE. Regenerated with central hemorrhagic necrosis and axonal spheroids.

Wernicke Encephalopathy — Gemini rated INACCURATE. Regenerated with mammillary body petechial hemorrhages and capillary proliferation.

Hepatic Encephalopathy — Gemini rated INACCURATE. Regenerated with Alzheimer type II astrocytes (pale watery nuclei).

Central Pontine Myelinolysis — Gemini rated INACCURATE. Regenerated with symmetric central pontine demyelination.

Lewy Body Dementia — Gemini rated INACCURATE. Regenerated with cortical Lewy bodies (poorly circumscribed eosinophilic inclusions).

Huntington Disease — Gemini rated INACCURATE. Regenerated with caudate atrophy and medium spiny neuron loss.

Anencephaly — Gemini rated INACCURATE. Regenerated with disorganized hemorrhagic neural remnants (not glandular tissue).

Spina Bifida – Micro — Gemini rated INACCURATE. Regenerated with dysplastic spinal cord tissue and disorganized neural elements.

Spina Bifida – Gross — Gemini rated PARTIALLY_ACCURATE. Regenerated with sac-like vertebral protrusion and neural placode.

Encephalocele — Gemini rated INACCURATE. Regenerated with brain herniation through skull defect.

Dandy-Walker — Gemini rated INACCURATE. Regenerated with vermis hypoplasia and cystic 4th ventricle.

Chiari Malformation — Gemini rated INACCURATE. Regenerated with tonsillar herniation and cervicomedullary kink.

Syringomyelia — Gemini rated INACCURATE. Regenerated with central fluid-filled cavity and gliotic lining.

Tethered Cord — Gemini rated PARTIALLY_ACCURATE. Regenerated with low-lying conus and thickened fatty filum.

Holoprosencephaly — Gemini rated PARTIALLY_ACCURATE. Regenerated with monoventricular fused brain.

Lissencephaly — Gemini rated INACCURATE. Regenerated with smooth cortical surface and absent gyri.

Microcephaly — Gemini rated INACCURATE. Regenerated with small brain and simplified gyral pattern.

Megalencephaly — Gemini rated INACCURATE. Regenerated with enlarged brain and broad gyri.

Corpus Callosum Agenesis — Gemini rated PARTIALLY_ACCURATE. Regenerated with absent CC, separated hemispheres, and Probst bundles.

Schizencephaly — Gemini rated INACCURATE. Regenerated with full-thickness cleft lined by polymicrogyria.

Porencephaly — Gemini rated INACCURATE. Regenerated with smooth-walled cavity and gliotic lining.

Hydranencephaly — Gemini rated PARTIALLY_ACCURATE. Regenerated with absent hemispheres and preserved brainstem.

Communicating Hydrocephalus — Gemini rated INACCURATE. Regenerated with dilated ventricles and stretched ependyma.

Non-communicating Hydrocephalus — Gemini rated INACCURATE. Regenerated with ependymal breaks and periventricular edema.

Hydrocephalus ex vacuo — Gemini rated INACCURATE. Regenerated with enlarged ventricles and widened sulci from atrophy.

Cerebral Edema — Gemini rated PARTIALLY_ACCURATE. Regenerated with pale neuropil and widened perivascular spaces.

Neurosarcoidosis — Gemini rated INACCURATE. Regenerated with non-caseating granulomas and epithelioid histiocytes.

PSP — Gemini rated INACCURATE. Regenerated with globose tangles and tufted astrocytes.

MSA — Gemini rated INACCURATE. Regenerated with GCIs (Papp-Lantos bodies) in oligodendrocytes.

FULL MEDICAL ACCURACY AUDIT COMPLETED: All 64 slides reviewed for WHO 2021 classification compliance and medical accuracy. Anaplastic Astrocytoma renamed to 'Astrocytoma, IDH-mutant, CNS WHO Grade 3' with CDKN2A/B deletion criteria added. Pilocytic Astrocytoma grading updated from 'WHO Grade I' to 'CNS WHO grade 1'. Anaplastic Oligodendroglioma renamed to 'Oligodendroglioma, IDH-mutant and 1p/19q-codeleted, CNS WHO Grade 3'. Myxopapillary Ependymoma grading updated from 'WHO Grade II' to 'CNS WHO grade 2'. ATRT grading updated from 'WHO Grade IV' to 'CNS WHO grade 4'. Meningioma grading updated from Roman to Arabic numerals. HSV Encephalitis: Corrected misattribution of 'owl's eye' appearance. Agenesis of Corpus Callosum: Corrected developmental sequence.

Glioblastoma, IDH-wildtype, CNS WHO Grade 4 — Pass. Title and description use current WHO 2021 classification. Correct terminology (IDH-wildtype, CNS WHO grade 4). Description accurately covers pseudopalisading necrosis, microvascular proliferation, and grading criteria.

Astrocytoma, IDH-mutant, WHO Grade 2 — Pass. Title and description use WHO 2021 classification. Correct emphasis on IDH mutation requirement. Description accurately covers infiltrative growth, perineuronal satellitosis, and absence of necrosis/microvascular proliferation.

Anaplastic Astrocytoma — Fixed. Renamed to 'Astrocytoma, IDH-mutant, CNS WHO Grade 3'. Updated description to include CDKN2A/B homozygous deletion as grade 4 upgrade criterion per WHO 2021.

Pilocytic Astrocytoma — Fixed. Updated 'WHO Grade I' to 'CNS WHO grade 1' (Arabic numerals per WHO 2021). Description content medically accurate.

Oligodendroglioma (IDH-mutant, 1p/19q codeleted) — Pass. Title correctly includes molecular markers. Description accurately covers fried-egg artifact, chicken-wire vasculature, calcifications, and molecular requirements.

Anaplastic Oligodendroglioma — Fixed. Renamed to 'Oligodendroglioma, IDH-mutant and 1p/19q-codeleted, CNS WHO Grade 3'. Arabic numerals applied.

Ependymoma — Pass. Description accurately covers perivascular pseudorosettes, true ependymal rosettes, and molecular subgrouping.

Myxopapillary Ependymoma — Fixed. Updated 'WHO Grade II' to 'CNS WHO grade 2'. WHO 2021 upgraded myxopapillary ependymoma from grade 1 to grade 2.

Medulloblastoma — Pass. Accurate: small round blue cells, Homer-Wright rosettes, four molecular subgroups (WNT, SHH, Group 3, Group 4), desmoplastic/nodular variant.

ATRT — Fixed. Updated 'WHO Grade IV' to 'CNS WHO grade 4'. SMARCB1/INI1 loss correctly described as defining molecular feature.

Meningioma — Fixed. Updated grading from Roman to Arabic numerals: 'WHO Grade I/II/III' to 'CNS WHO grade 1/2/3'. Description content (psammoma bodies, whorls, pseudoinclusions) medically accurate.

Schwannoma — Pass. Accurate: Antoni A/B areas, Verocay bodies, S-100 positivity, encapsulated growth pattern. Vestibular schwannoma location correct.

Neurofibroma — Pass. Accurate: mixed cell composition, wavy nuclei, mast cells, nerve fiber entrapment vs displacement in schwannoma. NF1 association and MPNST risk correctly noted.

Metastatic Carcinoma to Brain — Pass. Accurate: well-demarcated pushing border, site-specific morphology patterns, IHC markers (TTF-1, GATA3). Hemorrhage-prone primaries correctly listed.

Multiple Sclerosis – H&E — Pass. Accurate: active plaques with lipid-laden macrophages, perivascular cuffing, shadow plaques, chronic inactive plaques. Lesion distribution correct.

Multiple Sclerosis – Luxol Fast Blue — Pass. Accurate: LFB staining characteristics, Dawson fingers, shadow plaque appearance. Staining methodology correctly described.

Neuromyelitis Optica — Pass. Accurate: aquaporin-4 targeting, eosinophilic infiltrates distinguishing from MS, astrocyte destruction, longitudinally extensive transverse myelitis criteria.

ADEM — Pass. Accurate: monophasic perivenous demyelination, same-age lesions distinguishing from MS, post-infectious etiology.

PML — Pass. Accurate: JC polyomavirus etiology, oligodendrocyte destruction, ground-glass nuclei, bizarre astrocytes, immunocompromised association.

Viral Encephalitis — Pass. Accurate: perivascular lymphocytic cuffing, microglial nodules, neuronophagia. Common etiologies and distribution patterns correct.

Herpes Simplex Encephalitis — Fixed. Corrected misattribution of 'owl's eye' appearance (CMV, not HSV) in Cowdry type A inclusion description. Temporal lobe predilection and hemorrhagic necrosis correct.

CMV Encephalitis — Pass. Accurate: owl's eye inclusions, periventricular predilection, immunocompromised association, congenital vs acquired distinction.

SSPE — Pass. Accurate: persistent measles infection, Cowdry type A and B inclusions, progressive fatal course, characteristic EEG pattern.

Acute Bacterial Meningitis — Pass. Accurate: purulent leptomeningeal inflammation, neutrophilic infiltrate, age-based organism distribution.

Cerebral Abscess — Pass. Accurate: cerebritis-to-capsule evolution stages, ring-enhancing pattern, sources of infection.

Tuberculous Meningitis — Pass. Accurate: basal meningeal exudate, caseating granulomas, Langhans giant cells, CSF findings.

Cryptococcal Meningitis — Pass. Accurate: soap-bubble appearance, mucin-positive capsule, India ink preparation, immunocompromised association.

Toxoplasmosis — Pass. Accurate: ring-enhancing lesions, tachyzoite/bradyzoite forms, immunocompromised association, congenital infection features.

Naegleria (PAM) — Pass. Accurate: Naegleria fowleri, warm freshwater exposure, cribriform plate entry, rapidly fatal course.

Acute Ischemic Stroke — Pass. Accurate: temporal evolution of histopathological changes at 12-24 hours, red neurons, neutrophilic infiltrate.

Chronic Ischemic Stroke — Pass. Accurate: cystic cavitation, gliosis, macrophage-mediated cleanup, weeks-to-months evolution.

Intracerebral Hemorrhage — Pass. Accurate: blood extravasation into parenchyma, hypertensive etiology, basal ganglia predilection.

Subarachnoid Hemorrhage — Pass. Accurate: subarachnoid space blood accumulation, berry aneurysm association, vasospasm risk.

Epidural Hematoma — Pass. Accurate: arterial hemorrhage between skull and dura, middle meningeal artery, lucid interval.

Subdural Hematoma — Pass. Accurate: bridging vein rupture, elderly/infant predilection, acute vs chronic distinction.

Cavernous Angioma — Pass. Accurate: low-flow vascular malformation, thin-walled sinusoidal channels, hemosiderin deposits.

Spinal Cord Injury — Pass. Accurate: traumatic cord injury pathology, hemorrhagic necrosis, Wallerian degeneration.

Wernicke Encephalopathy — Pass. Accurate: thiamine (vitamin B1) deficiency, mammillary body and periaqueductal involvement, alcoholism association.

Hepatic Encephalopathy — Pass. Accurate: Alzheimer type II astrocytes, hyperammonemia, portal-systemic shunting.

Central Pontine Myelinolysis — Pass. Accurate: osmotic demyelination syndrome, rapid sodium correction etiology, central pontine location.

Alzheimer Disease — Pass. Accurate: neuritic plaques, neurofibrillary tangles, amyloid-beta and hyperphosphorylated tau pathology.

Parkinson Disease — Pass. Accurate: substantia nigra depigmentation, Lewy bodies, alpha-synuclein aggregation.

Lewy Body Dementia — Pass. Accurate: cortical Lewy bodies in addition to brainstem, alpha-synuclein, visual hallucinations, fluctuating cognition.

Huntington Disease — Pass. Accurate: CAG trinucleotide repeat, caudate nucleus atrophy, medium spiny neuron loss, autosomal dominant.

ALS — Pass. Accurate: upper and lower motor neuron degeneration, Bunina bodies, TDP-43 inclusions, anterior horn cell loss.

Creutzfeldt-Jakob Disease — Pass. Accurate: spongiform encephalopathy, prion protein (PrPSc), 14-3-3 protein, rapidly progressive dementia.

Progressive Supranuclear Palsy — Pass. Accurate: tau-positive globose neurofibrillary tangles, midbrain atrophy, vertical gaze palsy.

Multiple System Atrophy — Pass. Accurate: alpha-synucleinopathy distinct from Parkinson and DLB, glial cytoplasmic inclusions, cerebellar/parkinsonian/autonomic subtypes.

Anencephaly — Pass. Accurate: anterior neural tube closure failure, area cerebrovasculosa, disorganized neural tissue, folic acid prevention.

Spina Bifida – Microscopic — Pass. Accurate: dysplastic neural elements, neural placode, myelomeningocele vs meningocele distinction, Chiari II association.

Spina Bifida – Gross — Pass. Accurate: lumbosacral predilection, neural placode appearance, Chiari II association, hydrocephalus.

Encephalocele — Pass. Accurate: occipital vs frontoethmoidal geographic distribution, meningocele vs encephalocele distinction, prognosis factors.

Dandy-Walker Malformation — Pass. Accurate: three diagnostic features (vermis hypoplasia, 4th ventricle cyst, posterior fossa enlargement), foraminal atresia, associated anomalies.

Chiari Malformation — Pass. Accurate: Chiari I vs II distinction, cervicomedullary kink, myelomeningocele association, 5mm tonsillar herniation criterion.

Syringomyelia — Pass. Accurate: syrinx vs hydromyelia distinction (gliotic vs ependymal lining), cape-like sensory loss mechanism, spinothalamic fiber crossing.

Tethered Cord Syndrome — Pass. Accurate: L1-L2 normal conus position, fatty filum, associated dysraphisms, cutaneous stigmata.

Holoprosencephaly — Pass. Accurate: alobar/semilobar/lobar spectrum, 'face predicts brain', trisomy 13 and SHH/ZIC2/SIX3 genes, maternal diabetes.

Lissencephaly — Pass. Accurate: Type I four-layered cortex, Type II cobblestone, LIS1/DCX genes, Walker-Warburg syndrome association.

Microcephaly — Pass. Accurate: >2 SD below mean definition, primary vs secondary distinction, ASPM/MCPH1 genes, Zika virus association.

Megalencephaly — Pass. Accurate: PI3K-AKT-mTOR pathway, hemimegalencephaly, balloon cells, Sotos/Weaver syndromes.

Agenesis of Corpus Callosum — Fixed. Corrected developmental sequence from 'rostrum-to-splenium' to 'genu-to-splenium, with the rostrum forming last'. The corpus callosum develops genu first, then body, splenium, and finally rostrum.

Schizencephaly — Pass. Accurate: full-thickness cleft with polymicrogyric lining, open vs closed lip distinction, EMX2 mutations, distinction from porencephaly.

Porencephaly — Pass. Accurate: gliotic/ependymal lining (vs gray matter in schizencephaly), destructive etiology, MCA territory and PVL distributions.

Hydranencephaly — Pass. Accurate: bilateral ICA occlusion etiology, preserved posterior circulation structures, falx preservation, transillumination, distinction from hydrocephalus.

Communicating Hydrocephalus — Pass. Accurate: impaired CSF absorption, transependymal flow, proportional ventricular dilation, NPH triad (gait, dementia, incontinence).

Non-communicating Hydrocephalus — Pass. Accurate: aqueductal stenosis as most common site, proximal dilation pattern, endoscopic third ventriculostomy option.

Hydrocephalus ex vacuo — Pass. Accurate: compensatory enlargement, proportional sulcal widening, normal ICP, distinction from NPH, no treatment needed.

Cerebral Edema — Pass. Accurate: vasogenic vs cytotoxic vs interstitial types, steroid responsiveness distinction, aquaporin-4 role.

Neurosarcoidosis — Pass. Accurate: non-caseating granulomas, basal meningitis, asteroid/Schaumann bodies, distinction from TB and fungal granulomas.

Accuracy checked with Gemini for Anaplastic Astrocytoma (CNS > Neoplasm-Glial) slide content. Content was accurate — no updates needed.

Accuracy checked with Gemini and correct info via ChatGPT added for Diffuse Astrocytoma (CNS > Neoplasm-Glial) slide content.

Accuracy checked with Gemini and correct info via ChatGPT added for Glioblastoma (CNS > Neoplasm-Glial) slide content.