EYE am FINE

Epidemic keratoconjunctivitis (EKC), pharyngeal conjunctival fever (PCF), and nonspecific follicular conjunctivitis caused by adenovirus

eye_doc — Tue, 22 Apr 2025 08:56:03 +0900

Adenovirus, a non-enveloped DNA virus, is a common cause of viral conjunctivitis, particularly presenting in three main clinical forms:

Epidemic keratoconjunctivitis (EKC)
Pharyngoconjunctival fever (PCF)
Simple follicular conjunctivitis

Epidemic Keratoconjunctivitis (EKC)

Caused by Adenovirus types 8, 19, and 37 (type 8 most common)
Highly contagious, spreads through tears and eye secretions
Begins in one eye, then affects the other with asymmetry
Symptoms: redness, discharge, tearing, lymphadenopathy
Corneal involvement: SPK → SEI → visual disturbance
Steroid drops may reduce SEI severity if given early

Pharyngoconjunctival Fever (PCF)

Common in children, caused by Adenovirus type 3
Triad: sore throat, conjunctivitis, fever
Bilateral onset, resolves spontaneously in 7–14 days

Simple Follicular Conjunctivitis

Mildest form, usually subclinical or self-limiting
Appears in late or mild stages of adenoviral infection

Adenovirus Conjunctivitis Comparison Table (English)

TypeEKCPCFSimple Follicular Conjunctivitis

Cause	Adenovirus 8, 19, 37	Adenovirus 3	Various adenoviruses
Laterality	Starts unilateral → spreads asymmetrically	Bilateral simultaneous onset	Mild and often unnoticed
Key Signs	SPK, SEI, pseudomembrane, lymphadenopathy	Sore throat + fever + follicular conjunctivitis	Mild follicles only
Course	~2–3 weeks, SEI may persist for months	Resolves in 7–14 days	Clears within days
Treatment	Artificial tears, topical steroids if needed	Supportive care	Usually no treatment required

Apollo eye disease Acute Hemorrhagic Conjunctivitis (AHC) Infectious eye disease, eye discharge, congestion, lymph nodes before the ear

eye_doc — Tue, 22 Apr 2025 08:33:32 +0900

“Acute Hemorrhagic Conjunctivitis (AHC) – Apollo Eye Disease”

AHC, also known as Apollo eye disease, is an extremely contagious viral conjunctivitis,
primarily caused by enterovirus 70 (EV70) and coxsackievirus A24 (CA24).
It presents rapidly with subconjunctival hemorrhage, follicular reaction, and bilateral progression.

Summary Table for AHC

FeatureDescription

Common Name	Apollo eye disease
Causative Viruses	Enterovirus 70, Coxsackie A24
Transmission	Direct contact with discharge
or fomites like towels, hands
Incubation Period	18–36 hours
Key Signs
– Follicles, subconjunctival hemorrhage
– Preauricular lymphadenopathy (60%)
– Tearing, sticky eyelids, purulent discharge
Progression
– Starts unilateral, progresses to both eyes
– Highly contagious, outbreaks common
Course & Recovery
– Self-limited, resolves in 1–2 weeks
– Treatment is supportive (cold compress, hygiene)
– Antibiotics typically not helpful

✅ Clinical Tip
– Red eyes + subconjunctival hemorrhage + sticky eyelids = suspect AHC
– Emphasize hygiene, isolation, and contact precautions
– Prevent outbreaks in schools/workplaces

Orbital Surgery for orbital tumor, principel and methods, approach

eye_doc — Tue, 22 Apr 2025 00:07:51 +0900

Because of the orbit’s confined space and proximity to critical neurovascular structures, orbital surgery must follow five core principles to ensure both safe tumor resection and postoperative outcomes.

5 Principles of Orbital Surgery

Select the Closest and Safest Approach
- Route should provide proximity and minimize collateral damage
- Choose anatomically safe zones; bilateral access if needed
Ensure Adequate Surgical Exposure
- Wide incision is essential
- Use local epinephrine injection and maintain hemostasis
Approach from Normal to Pathologic Tissue
- Favor blunt dissection
- Sacrifice minimal normal tissue for en bloc resection if necessary
- For cysts, leave margin to avoid rupture
Avoid Aggressive Maneuvers
- Especially in orbital apex where optic nerve and muscles are at risk
- Avoid blind dissection behind tumors
Postoperative Monitoring and Management
- Watch for retrobulbar hemorrhage: check vision, IOP, pupil
- Use ultrasound/CT promptly
- Drain insertion (Vacuum drain) when high-risk
- Do not over-suture the wound tightly → avoid pressure buildup

5 Principles of Orbital Surgery Summary Table (English)

PrincipleKey PointPractical Tip

1	Use closest, safest approach	Bilateral access if needed for space
2	Ensure clear field	Wide incision, epinephrine, thorough hemostasis
3	From normal → lesion; blunt dissection preferred	Sacrifice tissue margin for complete excision
4	Avoid blind/aggressive maneuvers	Avoid optic nerve or EOM damage
5	Strict postoperative care	Monitor retrobulbar hemorrhage, drain if necessary

Metastatic orbital tumor Breast cancer, lung cancer, prostate cancer Invasion of extraocular muscles, proptosis, diplopia, pain

eye_doc — Tue, 22 Apr 2025 00:04:51 +0900

“Metastatic Orbital Tumors – Clinical Clues and Imaging Insights”

Metastasis to the orbit occurs in about 2–4% of cancer patients,
accounting for 1–3% of all orbital tumors.
All metastases reach the orbit via hematogenous spread, as the orbit lacks lymphatic channels.
Most often, it reflects advanced systemic malignancy and carries a poor prognosis.

Summary Table – Metastatic Orbital Tumors

FeatureDescription

Common Primary Sites
– Breast cancer (40–70%)
– Lung, prostate, melanoma
Spread Mechanism	Hematogenous (no lymphatics)
Frequent Symptoms
– Proptosis, diplopia, pain
– Extraocular muscle palsy, enophthalmos
Muscle Involvement
– Usually single EOM (medial or lateral rectus)
– Often involves muscle belly to tendon
Imaging (CT/MRI)
– Focal enhancement, soft tissue mass
– May involve bone and orbital apex
– Rarely >10mm in size
Differential Diagnosis
– Thyroid orbitopathy, orbital pseudotumor
– Lymphoma, trauma-related displacement
Biopsy
– Confirm via excisional or fine-needle aspiration biopsy (FNAB)
Prognosis
– Poor overall: mean survival ~15 months
– Treatment focused on palliation and vision preservation

✅ Clinical Insight
– Late-onset diplopia + prior cancer history = suspect orbital metastasis
– EOM enlargement alone is nonspecific → confirm with imaging and biopsy

Langerhans Cell Histiocytosis (LCH) Ophthalmic Invasion, Ophthalmic Invasion, Orbital Tumor

eye_doc — Mon, 21 Apr 2025 23:57:36 +0900

Langerhans Cell Histiocytosis (LCH) is a rare, systemic disorder characterized by clonal proliferation of abnormal Langerhans cells, affecting bone, skin, lymph nodes, and internal organs.
Orbital involvement is found in about 20–23% of LCH cases, with proptosis and superolateral bone erosion being classic findings.

Classification & History

Previously grouped as Histiocytosis X (Eosinophilic Granuloma, Hand-Schüller-Christian, Letterer-Siwe)
Now considered a spectrum of a single disease based on shared pathology
Different clinical severity and prognosis depending on extent

Diagnosis

Histology: Grooved nucleus, eosinophils, plasma cells
EM: Birbeck granules = “tennis racket” shaped organelles
IHC: CD1a and S100 positivity
Imaging: CT/MRI reveals bone destruction, soft tissue mass

Clinical Manifestations & Management

Localized lesion: biopsy, steroid injection
Multifocal/multisystem: radiation + chemotherapy (prednisone + vinblastine)
Most commonly affects frontal bone, causing superolateral orbital mass and displacement

Prognosis

Worse with younger age (<2y) and multisystem involvement
Mortality: ~55–60% under 2 years; ~15% over 3 years
Diabetes insipidus indicates risk of chronic disease/recurrence

LCH Subtypes Summary Table (English)

SubtypeKey FeaturesPrognosis

Eosinophilic Granuloma	Localized to bone, 4–7 y/o, uni/multifocal lesions	Favorable
Hand-Schüller-Christian	Bone + soft tissue, proptosis + skull lesions + DI	Intermediate
Letterer-Siwe	Acute, systemic, multiorgan (liver, spleen, marrow)	Poor
Orbital LCH	Superolateral bone erosion on imaging	Depends on dissemination
Diagnostic Markers	CD1a(+), S100(+), Birbeck granules	Mandatory for diagnosis

Orbital fibrous histiocytoma pathological characteristics and ophthalmological clinical occurrence site, symptoms, and treatment

eye_doc — Mon, 21 Apr 2025 23:55:36 +0900

“Fibrous Histiocytoma of the Orbit – Most Common Adult Mesenchymal Tumor”

Fibrous histiocytoma (FH) is a mesenchymal tumor composed of fibroblast- and histiocyte-like cells,
and is considered the most common primary mesenchymal tumor of the adult orbit.
It is typically located in the superonasal quadrant and presents with painless proptosis and globe displacement.

Summary Table – Orbital Fibrous Histiocytoma

FeatureDescription

Age Group	Typically middle-aged adults
Location	Superonasal orbit
Frequency	Most common adult orbital mesenchymal tumor
– ~10% of all orbital tumors in head & neck region
Clinical Presentation
– Proptosis
– Inferotemporal globe displacement
– Visual changes (if optic nerve involved)
Histologic Features
– Pleomorphic spindle cells
– Mixed inflammation and collagen bundles
– Often well-encapsulated
– May show lipid-laden macrophages, multinucleation
Treatment
– Benign: local excision
– Malignant: may require orbital exenteration
Immunohistochemistry	Vimentin, CD68 positive (variable)

✅ Clinical Insight
– If imaging shows well-circumscribed orbital mass with superonasal location, consider FH
– Must differentiate from dermatofibroma, giant cell tumor, sarcoma variants
– Histopathology remains diagnostic gold standard

https://argzumbang.tistory.com/442

Pathophysiology, classification, diagnosis, treatment, and prognosis of rhabdomyosarcoma, the most common malignant orbital tumor in children

eye_doc — Mon, 21 Apr 2025 23:51:28 +0900

Rhabdomyosarcoma is the most common primary malignant orbital tumor in children, originating from mesenchymal cells that would normally differentiate into striated muscle. It accounts for approximately 5% of pediatric malignancies and 2–4% of orbital masses.

Epidemiology & Features

Median age: 7–8 years, mostly diagnosed before age 6
Clinical signs: Rapidly progressive, painless proptosis, lid swelling, ptosis
Lesion often located in the superonasal quadrant of the orbit
May mimic chalazion or allergic eyelid edema, delaying diagnosis

Histologic Subtypes

Embryonal: Most common, seen in infants/toddlers, good prognosis
Alveolar: Highly metastatic, poor prognosis
Pleomorphic: Rare, best prognosis
Botryoid: Grape-like appearance, often arises in mucosal tissues

Diagnosis & Treatment

Urgent biopsy required for confirmation
Treatment includes surgical resection, radiotherapy, and chemotherapy
Embryonal subtype is highly radiosensitive
Survival beyond 2 years post-treatment implies cure
If relapse occurs, average survival time is ~12 months

Rhabdomyosarcoma Summary Table (English)

CategoryDetails

Typical Age	7–8 years (mostly under 6)
Key Symptoms	Painless proptosis, sudden lid swelling, ptosis
Common Location	Superonasal orbit
Differentials	Chalazion, allergic swelling, orbital cellulitis
Histologic Types	Embryonal, Alveolar, Pleomorphic, Botryoid
Treatment	Surgery + Radiotherapy + Chemotherapy
Prognosis	Good if caught early; 2-year survival suggests cure

Schwannoma Neurilemmoma Orbital and Conjunctival Eyelid Occurrence, Clinical Features, Imaging Findings, Surgical Treatment, Histological Diagnostic Criteria

eye_doc — Mon, 21 Apr 2025 23:49:45 +0900

“Orbital Schwannoma – From Anatomy to Histologic Diagnosis”

Schwannoma, also called neurilemmoma, is a benign tumor originating from Schwann cells
of the peripheral nerve sheath.
It is usually solitary in healthy individuals, but multiple lesions may indicate Neurofibromatosis Type I.

In ophthalmology, schwannomas are rare but may occur in the orbit, conjunctiva, uvea, or even eyelid.

Summary Table for Orbital Schwannoma

CategoryDetails

Origin	Schwann cell (neural sheath)
Common Locations	Spine, cranial nerves, orbit
Ocular Sites	Orbit > conjunctiva > ciliary body > choroid > eyelid
Imaging Findings
– Well-defined, homogenous mass on MRI
– Enhancement with contrast
– May be intra- or extraconal
Symptoms
– Proptosis, displacement of globe
– Optic nerve compression → visual symptoms
Surgical Indications
– Rapid growth, compressive symptoms
– Suspicion of malignancy
Histologic Diagnosis
– Antoni A: Densely packed spindle cells
– Antoni B: Loosely arranged cells
– Strong S-100 positivity on immunostaining

✅ Clinical Insight
– When suspected orbital mass shows homogenous features and is well-encapsulated: consider schwannoma
– Biopsy required for definitive diagnosis; S-100 marker is key
– If malignant features are noted → consider orbital exenteration

https://argzumbang.tistory.com/440

Types of neurofibromas and neurofibromatosis (NF1, NF2), diagnostic criteria, ophthalmologic findings, and related genetic diseases

eye_doc — Mon, 21 Apr 2025 23:46:30 +0900

Neurofibromas are benign peripheral nerve sheath tumors, commonly associated with Neurofibromatosis Type 1 (NF1) and Type 2 (NF2), which are multisystem genetic disorders with distinct clinical and ocular features.

Neurofibromatosis Type 1 (NF1)

Incidence: 1 in 2,600–3,000 births
Main features: Skin lesions, peripheral nerve tumors
Diagnosis (≥2 of NIH criteria):
1) ≥6 café-au-lait macules
2) Axillary/groin freckling
3) ≥2 neurofibromas or 1 plexiform type
4) Optic pathway glioma
5) ≥2 Lisch nodules (iris hamartomas)
6) Bone dysplasia (e.g., sphenoid wing)
7) First-degree relative with NF1
Ocular signs: Optic glioma, Lisch nodules, RPE hamartoma, retinal astrocytoma

Neurofibromatosis Type 2 (NF2)

Incidence: 1 in 25,000 births
Main features: Multiple intracranial and intraspinal tumors
Diagnosis (any 1 of the following):
1) Bilateral vestibular schwannomas
2) Unilateral schwannoma + NF2 family history
3) NF2 family history + any two of: meningioma, glioma, schwannoma, cataract
4) Multiple meningiomas + unilateral schwannoma
5) Multiple meningiomas + any two of: schwannoma, glioma, cataract
Ocular signs: Posterior subcapsular cataract, epiretinal membrane, optic sheath meningioma

NF1 vs. NF2 Comparison Table (English)

CategoryNF1NF2

Incidence	1 in 2,600–3,000 births	1 in 25,000 births
Main Involvement	Skin, peripheral nervous system	CNS tumors (vestibular, meningioma, glioma)
Diagnostic Criteria	≥2 NIH features	1 major criterion
Hallmark Signs	Skin spots, neurofibromas, Lisch nodules	Vestibular schwannomas, meningiomas, cataracts
Ocular Findings	Optic glioma, Lisch nodules, retinal lesions	Posterior cataract, ERM, optic sheath tumors

Types of ocular hypersensitivity reactions, Gell & Coombs classification Immediate allergic autoimmune, cytotoxic, delayed reactions

eye_doc — Mon, 21 Apr 2025 23:44:16 +0900

“Hypersensitivity Reactions in Ophthalmology – Types I to IV”

Hypersensitivity refers to inappropriate or exaggerated immune responses to antigens
that are typically tolerated by the body.
The Gell and Coombs classification (1963) remains the standard,
dividing reactions into four types (I–IV), each with distinct immunologic mechanisms and
clear links to various ocular diseases.

Hypersensitivity Types & Ophthalmic Conditions

TypeMechanismOcular Examples

Type I (Immediate, IgE-mediated)
– Allergen binds to IgE on mast cells
→ release of histamine, prostaglandins, etc.
– SAC
– VKC, AKC, GPC
Type II (Cytotoxic)
– Antibodies (IgG/IgM) target cell-bound antigens
→ activate complement, cell lysis
– Mooren's ulcer
– Cicatricial pemphigoid
– Lens-induced uveitis
Type III (Immune complex-mediated)
– Antigen + antibody form immune complexes (IC)
→ deposit in tissue → complement activation → inflammation
– Wessely ring
– SLE, RA, Wegener's granulomatosis
– Necrotizing scleritis
– Stevens-Johnson syndrome
Type IV (Delayed, T-cell mediated)
– CD4+ T cells: IFN-γ, IL-2 → macrophage activation
– CD8+ T cells: direct cytotoxicity
– Contact dermatitis
– Phlyctenulosis
– Disciform keratitis
– Corneal graft rejection
– SEI in EKC
– VKC, AKC, GPC (Mixed I+IV)

✅ Clinical Insight
– Understanding the hypersensitivity type can guide treatment modality (e.g., antihistamines vs steroids vs immunosuppressants)
– Many ocular surface diseases are multifactorial (e.g., VKC = Type I + IV)