Pediatric Neuro-ophthalmology

Pediatric Optic Nerve Anomalies - Eye Spy Surprises

• Optic Nerve Hypoplasia (ONH)
  • Small disc, "double-ring" sign (DM/DD > 0.35 is normal, ONH often <0.1).
  • ↓VA, nystagmus, VF defects.
  • Systemic: Septo-optic dysplasia (SOD), endocrinopathy.
• Optic Nerve Coloboma
  • Inferonasal excavation, glistening white.
  • ↓VA (variable), superior VF defect.
  • Systemic: CHARGE syndrome, renal anomalies.
• Morning Glory Anomaly
  • Large, funnel-shaped disc, central glial tuft, radial vessels.
  • Poor VA (often <20/200), serous detachment risk.
  • Usually unilateral.
• Pediatric Optic Atrophy
  • Pale disc (sectoral/diffuse), ↓axons.
  • ↓VA, color vision defects, afferent pupillary defect.
  • Causes: Hereditary (e.g., Leber's), compressive, hypoxic, inflammatory.

⭐ Septo-optic dysplasia (De Morsier syndrome) triad: optic nerve hypoplasia, pituitary hypofunction, and midline brain defects (e.g., absent septum pellucidum or corpus callosum agenesis).

Childhood Nystagmus & Saccadic Issues - Wobbly Gaze Wonders

• Infantile Nystagmus Syndrome (INS):
  • Onset <6 months; horizontal, conjugate.
  • Pendular/jerk waveform; null zone (improves VA) may cause torticollis.
  • Exclude afferent defects (e.g., albinism).
• Spasmus Nutans: 📌 SNT Triad: Shimmering nystagmus (fine, rapid, asymmetric), Nodding head, Torticollis.
  • Onset 4-18 months; benign, resolves 3-5 yrs. Neuroimaging if atypical.
• Acquired Nystagmus:
  • Sudden onset, oscillopsia, with neuro signs (e.g., ataxia).
  • Brainstem/cerebellar lesion. Types: downbeat, upbeat, torsional.
• Opsoclonus-Myoclonus Syndrome (OMS):
  • "Dancing eyes, dancing feet": opsoclonus, myoclonus, ataxia.

  • ⭐ Paraneoplastic OMS in children: ~50% associated with neuroblastoma; urgent investigation.

• Saccadic Issues:
  • Ocular Motor Apraxia (Cogan): Impaired horizontal saccade initiation; head thrusts.

Pediatric Cranial Nerve Palsies - Nerve Glitch Gallery

• Etiologies: Congenital (common for isolated IV, VI), traumatic (birth/accidental), neoplastic (glioma), inflammatory/post-viral, ↑ICP (esp. VI nerve).
• CN III (Oculomotor): Ptosis, "down & out" eye, mydriasis, diplopia.
• CN IV (Trochlear): 📌 SO-4. Vertical/torsional diplopia (worse downgaze, head tilt away from lesion - Bielschowsky test), abnormal head posture.
• CN VI (Abducens): 📌 LR-6. Horizontal diplopia (worse ipsilateral gaze), esotropia, ipsilateral head turn.
• Multiple Palsies: Suspect tumor, cavernous sinus lesion, inflammation.
• Investigations: Neuro-ophthalmic exam, MRI (acquired/multiple/non-resolving).
• Management: Treat cause; observe; patch/prisms; botulinum toxin; surgery if persistent.

⭐ Congenital 4th nerve palsy is the most common isolated congenital cranial nerve palsy.

Pediatric Raised ICP & Mimics - Head Pressure Puzzles

Papilledema (optic disc swelling from ↑ICP) is a pediatric neuro-ophthalmic emergency. Differentiate from mimics like optic disc drusen.

• Papilledema:
  • Causes: Tumors, hydrocephalus, IIH, meningitis, sinus thrombosis.
  • Symptoms: Headache, vomiting, visual changes (transient obscurations, diplopia).
  • Signs: Swollen disc (blurred margins, elevation, hyperemia, hemorrhages).
• Pseudopapilledema:
  • Causes: Optic disc drusen, anomalous discs.
  • Features: Often asymptomatic, no true swelling.
• Investigations:
  • Urgent Neuroimaging (MRI).
  • LP (if no mass): CSF OP >25-28 cm H₂O in IIH.
  • B-scan (for drusen), OCT.

⭐ > IIH in children: CSF opening pressure >28 cm H₂O (sedated/obese) or >25 cm H₂O (awake, not obese) is diagnostic.

Start["🩺 Papilledema
• Optic disc swelling• Suspected case"]

Imaging["🔬 Urgent MRI/CT
• Rule out mass• Check ventricles"]

Consult["💊 Neurosurgery
• Surgical consult• Manage pressure"]

LPM["🔬 LP + Manometry
• CSF opening press• CSF analysis"]

IIH["🩺 IIH Diagnosis
• Idiopathic cause• High pressure"]

Pseudo["📋 Pseudo-edema
• Consider mimics• Normal pressure"]

Drusen["🔬 Drusen Check
• B-scan or OCT• FFA imaging"]

Start --> Imaging

Imaging -->|Mass found| Consult Imaging -->|No Mass| LPM

LPM -->|⬆️ OP >25| IIH LPM -->|Normal OP| Pseudo

Pseudo --> Drusen

style Start fill:#F7F5FD, stroke:#F0EDFA, stroke-width:1.5px, rx:12, ry:12, color:#6B21A8 style Imaging fill:#FFF7ED, stroke:#FFEED5, stroke-width:1.5px, rx:12, ry:12, color:#C2410C style Consult fill:#F1FCF5, stroke:#BEF4D8, stroke-width:1.5px, rx:12, ry:12, color:#166534 style LPM fill:#FFF7ED, stroke:#FFEED5, stroke-width:1.5px, rx:12, ry:12, color:#C2410C style IIH fill:#F7F5FD, stroke:#F0EDFA, stroke-width:1.5px, rx:12, ry:12, color:#6B21A8 style Pseudo fill:#FEF8EC, stroke:#FBECCA, stroke-width:1.5px, rx:12, ry:12, color:#854D0E style Drusen fill:#FFF7ED, stroke:#FFEED5, stroke-width:1.5px, rx:12, ry:12, color:#C2410C

##  High‑Yield Points - ⚡ Biggest Takeaways

> * **Optic nerve hypoplasia**: Linked to **septo-optic dysplasia** & **midline brain defects**.
> * **Congenital Horner syndrome**: **Miosis, ptosis, anhidrosis**; screen for **neuroblastoma**.
> * **Pediatric papilledema**: Suspect **hydrocephalus, tumors, IIH**; causes headache, vomiting.
> * **Craniopharyngioma**: Common suprasellar tumor; causes **bitemporal hemianopia**, endocrine dysfunction.
> * **LHON**: **Mitochondrial inheritance**; acute **painless bilateral vision loss** in young males.
> * **Congenital nystagmus**: Often idiopathic; identify **null point** for better vision.
> * **Duane Syndrome**: **Abducens dysgenesis**; limited abduction, globe retraction.