Craniofacial Syndromes & Globe Anomalies - Skull's Eye View
Key developmental anomalies affecting skull, orbit, and globe, often with significant visual implications.
Craniofacial Syndromes:
| Feature | Crouzon Syndrome | Apert Syndrome |
|---|---|---|
| Craniosynostosis | Coronal, sagittal, lambdoid (variable) | Bicoronal (Acrocephaly/Turribrachycephaly) |
| Midface Hypoplasia | Present | Present, often more severe |
| Proptosis | Often severe | Present |
| Hypertelorism | Present | Present |
| Hands/Feet | Normal | Syndactyly (mitten/sock) |
| Intellect | Usually normal | Variable, often impaired |
| Gene | FGFR2 | FGFR2 |
Globe Anomalies:
- Anophthalmos: True or clinical; complete absence of ocular tissue within orbit.
- Microphthalmos: Small globe (axial length < 20mm in adults). May be simple (structurally normal) or complex (associated with coloboma, cataract).
- Nanophthalmos: Type of microphthalmos; small, structurally normal eye with high hyperopia, ↑ risk of angle-closure glaucoma.
- Cryptophthalmos: Hidden eye; eyelids fail to separate, skin passes from forehead to cheek, obscuring the globe.
⭐ Most common craniosynostosis syndrome is Crouzon syndrome. FGFR2 gene mutations are common in both Crouzon and Apert syndromes.
Congenital Orbital Cysts & Tumors - Baby's Eye Bumps
Developmental anomalies presenting as orbital masses in infants/children. Early detection is key for visual development.
| Feature | Dermoid Cyst | Epidermoid Cyst | Teratoma |
|---|---|---|---|
| Presentation | Painless, firm, mobile nodule; superotemporal. Noted in early years. | Slow-growing, painless mass. | Often dramatic proptosis at birth. |
| Location | Superotemporal (commonest), superonasal. Near suture lines. | Anywhere, often bony suture lines. | Fills orbit, may extend intracranially. |
| Contents | Keratin, hair, sebaceous glands (oily). | Keratin, cholesterol (pearly). | Tissues from ≥2 germ layers (fat, cartilage, bone). |
| Imaging (CT/MRI) | Well-circ., heterogeneous (fat density), bony remodeling. No enhancement. | Well-circ., homogenous (CSF-like), DWI restriction. No enhancement. | Large, heterogeneous (calcification, fat, cysts). |
| Malignant Pot. | Very rare (SCC if ruptured). | Extremely rare. | Rare (malignant germ cell components). |
| Treatment | Complete surgical excision; avoid rupture. | Complete surgical excision. | Surgical excision, often challenging. |
Neural & Vascular Anomalies - Brainy Orbital Twists
- Meningoencephalocele: Herniation of meninges ± brain via skull defect into orbit.
- Anterior (Frontoethmoidal): Common. Pulsatile, compressible mass (superomedial orbit/nasal bridge), hypertelorism. ↑ with crying.
- Posterior (Spheno-orbital): Rare. Pulsatile exophthalmos, optic nerve signs.
- Dx: CT/MRI. Risk: CSF leak, meningitis.
- Congenital Vascular Anomalies:
- Capillary Hemangioma (Infantile): Most common benign orbital tumor (infancy). "Strawberry" (superficial) or bluish (deep) mass. Rapid growth then slow involution. Complications: Amblyopia (ptosis, astigmatism), proptosis. Tx: Propranolol (1st line).
- Lymphangioma: Congenital. Soft, bluish, transilluminating. Sudden enlargement with URI/hemorrhage ("chocolate cysts"). Infiltrative.
- Orbital Varix: Dilated veins. Intermittent proptosis with Valsalva (crying, straining). Phleboliths may be seen.
⭐ Anterior encephaloceles are often associated with hypertelorism and a non-tender, pulsatile mass at the superomedial orbit, which may increase in size with crying or straining.
High-Yield Points - ⚡ Biggest Takeaways
- Craniosynostosis syndromes (Crouzon, Apert) often cause shallow orbits and exophthalmos.
- Orbital dermoid cysts: common congenital lesions, typically at the superotemporal orbital rim.
- Anophthalmos/microphthalmos: severe eye absence/smallness, often linked to systemic conditions.
- Cryptophthalmos: skin covers the eye, strongly associated with Fraser syndrome.
- Congenital orbital teratomas: rare, cause dramatic unilateral proptosis in newborns.
- Anterior encephalocele: can present as pulsatile proptosis, worsening with crying.
- Optic nerve hypoplasia: associated with septo-optic dysplasia and midline brain defects.
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