ophtho.preseptal-cellulitis.core.v1PRODUCTION

ophtho.preseptal-cellulitis.core.v1

Preseptal (periorbital) cellulitis

general_internal_medicineacutesubacuteadultpediatric

Hard-required inputs

0 / 9

Care setting:

Encounter flow

12/12 authored

Canonical 12-phase frame with authored status for this dossier.

Current phase

Frame

Detailed

Frame around the ORBITAL SEPTUM: this engine owns PRESEPTAL (Chandler I — eyelid/periorbital soft tissue anterior to the septum, NO proptosis/EOM/acuity/RAPD/chemosis change, not toxic), the common (~71% vs ~28% orbital — Jackson & Baker Head Neck Surg 1987 PMID 3312114) and pediatric-predominant counterpart. The disciplined separation from orbital (postseptal) cellulitis IS the core job — any orbital sign routes OUT to ophtho.orbital-cellulitis.core.v1. Source sinusitis, sepsis, intracranial extension, and the necrotizing/facial-cellulitis look-alikes are recognised and routed OUT by engine_id, not re-authored here (Chandler 1970 PMID 5470225; Baiu & Melendez JAMA 2020 PMID 31935029).

Inputs

Actions

Advance rule

Set

Advance when

septum-based scope confirmed; not-this-engine concerns routed by engine_id

Patient inputs (16)

source_of_infection*history • CONTEXT

not present

Skin/adnexal breach (insect bite, trauma, hordeolum, impetigo, conjunctivitis) tends to stay preseptal; adjacent ethmoid sinusitis / dacryocystitis carries higher cross-to-orbital risk and lowers the imaging/admission threshold (Jackson & Baker 1987 PMID 3312114; Shih 2021 PMID 34607790; Rimon 2008 PMID 18825903)

age*demographic • CONTEXT

Preseptal cellulitis is pediatric-predominant; the young child has a lower admission/imaging threshold and an immunization-status check (Ambati Ophthalmology 2000 PMID 10919886; Brugha Pediatr Emerg Care 2012 PMID 22344208)

temperature*vital • CONTEXT

High fever / toxicity raises the postseptal and bacteraemic prior and lowers the admission threshold; afebrile insect-bite preseptal is a strong oral-outpatient candidate (Friedel Am J Ther 2019 PMID 28452841 — no insect-bite preseptal patient was febrile; Murphy 2020 PMID 32987452)

proptosis*symptom • ENTRY

Absence of proptosis is the single cardinal feature that keeps the diagnosis preseptal; any proptosis = postseptal until excluded and is the strongest predictor of surgical management (Murphy J Paediatr Child Health 2020 PMID 32987452 — proptosis strongest surgical predictor; Chandler 1970 PMID 5470225)

ophthalmoplegia_pain_on_eye_movement*symptom • RED_FLAGS

Painful or restricted extraocular movement indicates postseptal (intraorbital) disease — its absence is required to call it preseptal (Murphy 2020 PMID 32987452 — ophthalmoplegia an independent post-septal predictor; Baiu & Melendez JAMA 2020 PMID 31935029)

visual_acuity_and_colour_vision*symptom • RED_FLAGS

Decreased acuity / dyschromatopsia signals optic-nerve compromise = postseptal emergency; preseptal cellulitis by definition has normal acuity and colour vision (Chandler 1970 PMID 5470225; Kornelsen Cochrane 2021 PMID 33908631)

rapd_relative_afferent_pupillary_defect*symptom • RED_FLAGS

An RAPD is objective optic-nerve dysfunction — it is incompatible with preseptal disease and mandates immediate route-out to the orbital engine (Chandler 1970 PMID 5470225)

chemosis*symptom • RED_FLAGS

Conjunctival chemosis indicates orbital congestion / postseptal disease; its absence supports the preseptal call (Chandler 1970 PMID 5470225 — chemosis appears with orbital cellulitis)

sbp*vital • RED_FLAGS

Hypotension / systemic toxicity with a periorbital source → route OUT to id.sepsis.core.v1 (sepsis pathway not authored here)

contrast_ct_orbits_and_sinusesimaging • BRANCHING_WORKUP

not present

Contrast CT orbits + paranasal sinuses adjudicates the equivocal swollen eye and excludes postseptal disease / subperiosteal abscess; indicated for orbital signs, no improvement at 24-48 h, young child unable to be examined, or sinogenic source (Murphy 2020 PMID 32987452 — 30% imaged; Šuchaň Cesk Slov Oftalmol 2014 PMID 25640234)

immunization_status_hib_pcvhistory • CONTEXT

not present

Hib/PCV status reframes the pathogen prior and the bacteraemic-spread risk in the young child (Ambati Ophthalmology 2000 PMID 10919886 — Hib-related cellulitis fell 11.7%→3.5% post-vaccine; Rimon 2008 PMID 18825903)

immunocompromise_or_diabeteshistory • CONTEXT

not present

Diabetes / immunocompromise broadens the pathogen spectrum, lowers the admission threshold, and (with facial pain + necrosis) triggers the invasive-fungal reconsideration via the orbital engine

wbclab • INITIAL_WORKUP

Marked leukocytosis raises the postseptal/bacteraemic prior and supports admission; normal WBC + afebrile bite supports the oral-outpatient route (Murphy 2020 PMID 32987452; Friedel 2019 PMID 28452841 — non-bite group higher WBC/CRP)

crplab • INITIAL_WORKUP

Rising CRP is associated with greater risk of post-septal disease and need for surgery — a trigger to image / escalate to the orbital engine (Murphy J Paediatr Child Health 2020 PMID 32987452 — increasing CRP → post-septal disease/surgery)

pregnancyhistory • TREATMENT

not present

Antibiotic-safety gating for the oral regimen (avoid doxycycline / TMP-SMX, especially near term; amoxicillin-clavulanate/cephalexin preferred)

creatininelab • TREATMENT

Renal function gates dose adjustment of cephalexin / amoxicillin-clavulanate / TMP-SMX in the oral regimen

* = hard-required. Engine cannot meaningfully run until these are filled.

Severity triggers (8)

8 need judgement

informationallife_threateningany_orbital_sign_route_to_orbital_cellulitis
ANY of proptosis, painful/restricted extraocular movement, decreased visual acuity/colour vision, RAPD, or chemosis — the disease has crossed the septum; this is orbital (postseptal) cellulitis, NOT preseptal (Chandler Laryngoscope 1970 PMID 5470225; Murphy J Paediatr Child Health 2020 PMID 32987452)
Trigger could not be auto-evaluated — needs clinician judgement.
informationallife_threateningnecrotizing_lid_emergency_route_out
Dusky/violaceous or black eyelid skin, hemorrhagic bullae, crepitus, cutaneous anesthesia, pain out of proportion, or rapidly advancing necrosis of the lids with systemic toxicity (necrotizing fasciitis of the eyelids)
Trigger could not be auto-evaluated — needs clinician judgement.
informationalseveresystemic_toxicity_route_to_sepsis
qSOFA ≥2, hypotension on adequate fluids, high fever with toxic appearance and a periorbital source (Friedel Am J Ther 2019 PMID 28452841 — febrile group higher WBC/CRP and more severe)
Trigger could not be auto-evaluated — needs clinician judgement.
informationalmoderateyoung_child_lower_admission_threshold
Young child (esp. infant/incompletely Hib-PCV-immunized), poor feeding, or unable to be reliably examined with periorbital cellulitis (Ambati Ophthalmology 2000 PMID 10919886; Brugha Pediatr Emerg Care 2012 PMID 22344208)
Trigger could not be auto-evaluated — needs clinician judgement.
informationalmoderateunreliable_followup_admit
Cannot guarantee a 24-48 h orbital re-examination / reliable follow-up (social, geographic, caregiver, or comprehension barrier) in otherwise mild preseptal disease (Brugha Pediatr Emerg Care 2012 PMID 22344208)
Trigger could not be auto-evaluated — needs clinician judgement.
informationalmoderatedacryocystitis_or_sinogenic_source
Acute dacryocystitis (medial-canthal swelling over the lacrimal sac with expressible mucopurulent reflux) or adjacent ethmoid sinusitis as the source (Shih Br J Ophthalmol 2021 PMID 34607790; Jackson & Baker Head Neck Surg 1987 PMID 3312114)
Trigger could not be auto-evaluated — needs clinician judgement.
informationalmoderateherpes_zoster_ophthalmicus_mimic
V1-dermatomal grouped vesicles / crusting, Hutchinson sign (nasociliary tip involvement), prodromal neuralgic pain — herpes zoster ophthalmicus, not bacterial preseptal cellulitis (a key look-alike)
Trigger could not be auto-evaluated — needs clinician judgement.
informationalmildca_mrsa_risk_modifier
Community-MRSA risk: prior MRSA, purulent lid focus, high-prevalence setting, recurrent skin infection, immunocompromise (Shih Br J Ophthalmol 2021 PMID 34607790 — MRSA-era microbiology)
Trigger could not be auto-evaluated — needs clinician judgement.

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Recommended regimen

Preseptal (Chandler I) cellulitis — oral-first + IV escalation + source control + route-to-orbital trigger

axis: preseptal_cellulitis_oral_first_with_iv_escalationstep 1 - Step 1 — Septum triage gate (preseptal vs postseptal) before committing the oral pathway

Selected step "Step 1 — Septum triage gate (preseptal vs postseptal) before committing the oral pathway" — Periorbital swelling: assess proptosis, painful/restricted EOM, acuity/colour, RAPD, chemosis. Preseptal (Chandler I) only if ALL absent and not toxic; ANY present → route OUT

septum_triage_decision_gate_preseptal_vs_postseptal
first line
decision_gate
triggers: no_proptosis, no_painful_ophthalmoplegia, normal_acuity_and_colour, no_rapd, no_chemosis, not_toxic
Chandler Laryngoscope 1970 (PMID 5470225); Baiu & Melendez JAMA 2020 (PMID 31935029) — the orbital septum defines preseptal (I) vs orbital/postseptal (II-V). Preseptal-well = oral + close review; ANY orbital sign → route to ophtho.orbital-cellulitis.core.v1 (Murphy J Paediatr Child Health 2020 PMID 32987452 — proptosis the strongest surgical predictor).

outpatient playbook — drug actions (4)

1. amoxicillin-clavulanate (confirmed preseptal, low-risk)
rxcui 19711
875/125 mg adult / 45 mg/kg/day paeds • PO • BID × 7-10 d
trigger: Confirmed preseptal, mild, reliable, no MRSA risk (Shih Br J Ophthalmol 2021 PMID 34607790)
Streptococcal + MSSA + sinogenic Haemophilus/anaerobe oral cover
2. clindamycin (penicillin anaphylaxis / CA-MRSA)
rxcui 2582
300-450 mg adult / 10-13 mg/kg/dose paeds • PO • TID × 7-10 d
trigger: Severe penicillin allergy or CA-MRSA cover required (Shih 2021 PMID 34607790)
β-lactam allergy backup with CA-MRSA cover; C. difficile counsel
3. TMP-SMX (CA-MRSA risk, not pregnant)
rxcui 10831
1-2 DS adult / 8-12 mg/kg/day TMP paeds • PO • BID × 7-10 d
trigger: Community-MRSA risk, not pregnant, not young infant (Shih 2021 PMID 34607790)
CA-MRSA oral cover; add a β-lactam if streptococcal cover also required
4. warm compress ± I&D of hordeolum / lid abscess; route sinusitis/dacryocystitis source (parallel)
per source • local/procedural • as indicated
trigger: Identified hordeolum, lid abscess, sinusitis, or dacryocystitis source (Shih 2021 PMID 34607790; Jackson & Baker 1987 PMID 3312114)
Source control prevents recurrence and progression — route the sinus source to ent.acute-sinusitis.core.v1

Auto-drafted A&P note

outpatient

Subjective

- Possible entry pathways: Eyelid / periorbital erythema and oedema with NORMAL acuity, NORMAL colour vision, full painless eye movements, NO proptosis — preseptal (Chandler I) candidate (Chandler Laryngoscope 1970 PMID 5470225; Baiu & Melendez JAMA 2020 PMID 31935029); Periorbital swelling WITH proptosis, painful/restricted eye movement, decreased acuity/colour, RAPD, or chemosis — postseptal until excluded; route to ophtho.orbital-cellulitis.core.v1 (Murphy J Paediatr Child Health 2020 PMID 32987452); Eyelid/periorbital skin or adnexal breach as portal — insect bite, trauma/laceration, hordeolum/stye, impetigo, conjunctivitis (Friedel Am J Ther 2019 PMID 28452841; Rimon J Pediatr Ophthalmol Strabismus 2008 PMID 18825903).

Objective

- No vitals, labs, or imaging entered for this encounter.

Assessment

**Preseptal (periorbital) cellulitis** (ophtho.preseptal-cellulitis.core.v1).
Phenotype framing: Terminal differential with named pivots: preseptal cellulitis vs orbital (postseptal) cellulitis (proptosis + painful EOM + acuity/colour drop + RAPD + chemosis pivot — the septum; THE key pair) vs allergic/contact eyelid oedema (bilateral, pruritic, NON-tender, afebrile, no warmth pivot) vs insect-bite reaction (central punctum + itch + minimal systemic features pivot) vs chalazion/hordeolum (discrete focal lid nodule, minimal diffuse cellulitis pivot — may be the source) vs dacryocystitis/canaliculitis (medial-canthal swelling over the lacrimal sac, expressible mucopurulent reflux pivot — treat as source) vs herpes zoster ophthalmicus (V1-dermatomal grouped vesicles, Hutchinson sign, neuralgic pain pivot — route to HZO) vs necrotizing fasciitis of the lids (dusky/black skin, crepitus, pain out of proportion, systemic toxicity pivot — surgical emergency, route OUT)
Scope: Frame around the ORBITAL SEPTUM: this engine owns PRESEPTAL (Chandler I — eyelid/periorbital soft tissue anterior to the septum, NO proptosis/EOM/acuity/RAPD/chemosis change, not toxic), the common (~71% vs ~28% orbital — Jackson & Baker Head Neck Surg 1987 PMID 3312114) and pediatric-predominant counterpart. The disciplined separation from orbital (postseptal) cellulitis IS the core job — any orbital sign routes OUT to ophtho.orbital-cellulitis.core.v1. Source sinusitis, sepsis, intracranial extension, and the necrotizing/facial-cellulitis look-alikes are recognised and routed OUT by engine_id, not re-authored here (Chandler 1970 PMID 5470225; Baiu & Melendez JAMA 2020 PMID 31935029).

No severity triggers fired against current inputs.

Plan

Regimen axis: **Preseptal (Chandler I) cellulitis — oral-first + IV escalation + source control + route-to-orbital trigger** — step "Step 1 — Septum triage gate (preseptal vs postseptal) before committing the oral pathway".
1. septum_triage_decision_gate_preseptal_vs_postseptal (decision_gate, first line) — Chandler Laryngoscope 1970 (PMID 5470225); Baiu & Melendez JAMA 2020 (PMID 31935029) — the orbital septum defines preseptal (I) vs orbital/postseptal (II-V). Preseptal-well = oral + close review; ANY orbital sign → route to ophtho.orbital-cellulitis.core.v1 (Murphy J Paediatr Child Health 2020 PMID 32987452 — proptosis the strongest surgical predictor).

Setting playbook (outpatient) — Confirm preseptal (negative orbital exam), identify + treat the source, start oral antibiotics, and book a mandatory 24-48 h orbital re-check with explicit return precautions (Friedel Am J Ther 2019 PMID 28452841; Brugha Pediatr Emerg Care 2012 PMID 22344208; Chandler 1970 PMID 5470225)
2. amoxicillin-clavulanate (confirmed preseptal, low-risk) 875/125 mg adult / 45 mg/kg/day paeds PO BID × 7-10 d — Confirmed preseptal, mild, reliable, no MRSA risk (Shih Br J Ophthalmol 2021 PMID 34607790) (Streptococcal + MSSA + sinogenic Haemophilus/anaerobe oral cover)
3. clindamycin (penicillin anaphylaxis / CA-MRSA) 300-450 mg adult / 10-13 mg/kg/dose paeds PO TID × 7-10 d — Severe penicillin allergy or CA-MRSA cover required (Shih 2021 PMID 34607790) (β-lactam allergy backup with CA-MRSA cover; C. difficile counsel)
4. TMP-SMX (CA-MRSA risk, not pregnant) 1-2 DS adult / 8-12 mg/kg/day TMP paeds PO BID × 7-10 d — Community-MRSA risk, not pregnant, not young infant (Shih 2021 PMID 34607790) (CA-MRSA oral cover; add a β-lactam if streptococcal cover also required)
5. warm compress ± I&D of hordeolum / lid abscess; route sinusitis/dacryocystitis source (parallel) per source local/procedural as indicated — Identified hordeolum, lid abscess, sinusitis, or dacryocystitis source (Shih 2021 PMID 34607790; Jackson & Baker 1987 PMID 3312114) (Source control prevents recurrence and progression — route the sinus source to ent.acute-sinusitis.core.v1)

Non-pharmacologic actions:
- Document the NEGATIVE orbital exam explicitly (acuity, colour, pupils/RAPD, motility, globe position) (Chandler 1970)
- Warm compresses ± I&D for hordeolum/lid abscess; lacrimal-sac care for dacryocystitis (Shih 2021 PMID 34607790)
- Route the sinusitis source to ent.acute-sinusitis.core.v1; dacryocystitis to oculoplastics/ENT for definitive (DCR) management
- No adjunctive corticosteroid (Kornelsen Cochrane 2021 PMID 33908631)
- Explicit return precautions: any vision change, double vision, eye-movement pain, proptosis, increasing swelling, or fever → emergency return

AVOID / contraindication checks:
- Penicillin anaphylaxis block amoxicillin clavulanate and ampicillin sulbactam and cefazolin (use clindamycin ± vancomycin)
- Clindamycin c diff counsel (lincosamide colitis risk)
- Doxycycline avoid pregnancy and children under 8 (use TMP SMX with streptococcal cover or β lactam ± clindamycin instead)
- Tmp smx avoid near term pregnancy and young infants and G6PD (folate antagonism / kernicterus / haemolysis)
- Any orbital sign do not treat as preseptal route to orbital engine (Chandler 1970 — postseptal disease is sight  and life threatening; oral outpatient pathway is unsafe once the septum is crossed)
- No adjunctive corticosteroid (Kornelsen Cochrane 2021 — insufficient evidence)

Monitoring

Regimen monitoring:
- reassess orbital cluster acuity colour pupil RAPD motility proptosis chemosis at 24-48h (the has-it-crossed-the-septum question — Chandler 1970)
- expect periorbital erythema to settle on correct oral therapy; non-improvement at 24-48 h → CT + route to ophtho.orbital-cellulitis.core.v1 (Šuchaň Cesk Slov Oftalmol 2014 PMID 25640234)
- CRP trend rising CRP predicts post-septal disease and surgery (Murphy J Paediatr Child Health 2020 PMID 32987452)
- source resolution hordeolum dacryocystitis sinusitis at followup (Shih Br J Ophthalmol 2021 PMID 34607790)

Setting (outpatient) monitoring:
- Mandatory 24-48 h orbital re-check (acuity/colour/RAPD/motility/proptosis/chemosis) (Šuchaň Cesk Slov Oftalmol 2014 PMID 25640234)
- Symptom + source review at 24-48 h and end of course (Friedel Am J Ther 2019 PMID 28452841)
- Return precautions: any orbital sign, spreading erythema, fever, headache (Chandler 1970)

Follow-up plan: Complete the oral course (typically 7-10 d guided by source and response); treat and follow the SOURCE — definitive lacrimal management for recurrent dacryocystitis (anatomic cause; route to ENT/oculoplastics), ENT source-sinus management routed to ent.acute-sinusitis.core.v1, hordeolum/blepharitis lid hygiene, conjunctivitis treatment. Counsel return precautions: any vision change, double vision, eye-movement pain, the eye pushing forward (proptosis), increasing swelling, or fever → emergency return for orbital reassessment (the preseptal→orbital progression risk — Kornelsen Cochrane 2021 PMID 33908631). Recurrent preseptal disease → reconsider an anatomic lacrimal cause.
- Close-out criterion: oral course + source-directed follow-up + orbital-progression return precautions documented

Monitoring phase: Re-examine for the orbital cluster (acuity, colour, pupils/RAPD, motility, proptosis, chemosis) at the 24-48 h review — the critical question is "has it crossed the septum?" Expect periorbital erythema to settle on correct oral therapy; failure to improve, new orbital sign, rising CRP, or spreading erythema at 24-48 h mandates contrast CT + escalation to ophtho.orbital-cellulitis.core.v1, NOT silent oral continuation (Murphy J Paediatr Child Health 2020 PMID 32987452 — rising CRP → post-septal/surgery; Šuchaň Cesk Slov Oftalmol 2014 PMID 25640234 — 24-48 h non-improvement → escalate).

Disposition

Current setting: outpatient — Confirm preseptal (negative orbital exam), identify + treat the source, start oral antibiotics, and book a mandatory 24-48 h orbital re-check with explicit return precautions (Friedel Am J Ther 2019 PMID 28452841; Brugha Pediatr Emerg Care 2012 PMID 22344208; Chandler 1970 PMID 5470225)

Disposition criteria:
- Discharge on oral antibiotics with mandatory 24-48 h review if confirmed preseptal, mild, afebrile, reliable (Friedel Am J Ther 2019 PMID 28452841)
- Ambulatory IV / admit if young child, toxic, dacryocystitis/sinogenic source, immunocompromised, or unreliable follow-up (Brugha Pediatr Emerg Care 2012 PMID 22344208)
- Admit + route OUT for any orbital/postseptal sign, necrotizing features, or sepsis (Chandler 1970)

Escalation triggers (move to higher acuity):
- Any orbital sign (proptosis, painful/restricted EOM, acuity/colour drop, RAPD, chemosis) → route to ophtho.orbital-cellulitis.core.v1 (Chandler 1970 PMID 5470225)
- No improvement / rising CRP at 24-48 h → contrast CT + route to ophtho.orbital-cellulitis.core.v1 (Murphy 2020 PMID 32987452)
- Necrotizing features (dusky/black skin, crepitus) → emergent surgery, route to id.necrotising-fasciitis.core.v1
- Systemic toxicity / qSOFA ≥2 → route to id.sepsis.core.v1

Earlier-Return Triggers

Return-precaution thresholds (watch for):
- [LIFE_THREATENING] ANY of proptosis, painful/restricted extraocular movement, decreased visual acuity/colour vision, RAPD, or chemosis — the disease has crossed the septum; this is orbital (postseptal) cellulitis, NOT preseptal (Chandler Laryngoscope 1970 PMID 5470225; Murphy J Paediatr Child Health 2020 PMID 32987452)
- [LIFE_THREATENING] Dusky/violaceous or black eyelid skin, hemorrhagic bullae, crepitus, cutaneous anesthesia, pain out of proportion, or rapidly advancing necrosis of the lids with systemic toxicity (necrotizing fasciitis of the eyelids)
- [SEVERE] qSOFA ≥2, hypotension on adequate fluids, high fever with toxic appearance and a periorbital source (Friedel Am J Ther 2019 PMID 28452841 — febrile group higher WBC/CRP and more severe)

Citations

- Chandler classification (Chandler JR et al, Laryngoscope 1970) — stage I IS preseptal in the universal five-stage orbital-complication frame — anchored by the contemporary periorbital-vs-orbital review (Baiu & Melendez, JAMA 2020), the preseptal/orbital proportion + sinusitis-predisposition series (Jackson & Baker, Head Neck Surg 1987), pediatric predictors of post-septal disease/surgery (Murphy et al, J Paediatr Child Health 2020), the insect-bite oral-outpatient evidence (Friedel et al, Am J Ther 2019), the MRSA-era adult-source microbiology (Shih et al, Br J Ophthalmol 2021), the Hib/PCV epidemiology-shift series (Ambati, Ophthalmology 2000; Rimon, J Pediatr Ophthalmol Strabismus 2008), the ambulatory-IV preseptal evidence (Brugha & Abrahamson, Pediatr Emerg Care 2012), the conservative-IV-then-escalate series (Šuchaň, Cesk Slov Oftalmol 2014), and the corticosteroid-evidence Cochrane review (Kornelsen, Cochrane 2021). AAO/Wills-aligned. No 2024-2026 society guideline supersedes the Chandler septum frame. [PMID:5470225](https://pubmed.ncbi.nlm.nih.gov/5470225/)
- Cited evidence (PMID 31935029) [PMID:31935029](https://pubmed.ncbi.nlm.nih.gov/31935029/)
- Cited evidence (PMID 3312114) [PMID:3312114](https://pubmed.ncbi.nlm.nih.gov/3312114/)
- Cited evidence (PMID 32987452) [PMID:32987452](https://pubmed.ncbi.nlm.nih.gov/32987452/)
- Cited evidence (PMID 28452841) [PMID:28452841](https://pubmed.ncbi.nlm.nih.gov/28452841/)

Last reconciled with current guidelines: 2026-05-17.

References

Chandler classification (Chandler JR et al, Laryngoscope 1970) — stage I IS preseptal in the universal five-stage orbital-complication frame — anchored by the contemporary periorbital-vs-orbital review (Baiu & Melendez, JAMA 2020), the preseptal/orbital proportion + sinusitis-predisposition series (Jackson & Baker, Head Neck Surg 1987), pediatric predictors of post-septal disease/surgery (Murphy et al, J Paediatr Child Health 2020), the insect-bite oral-outpatient evidence (Friedel et al, Am J Ther 2019), the MRSA-era adult-source microbiology (Shih et al, Br J Ophthalmol 2021), the Hib/PCV epidemiology-shift series (Ambati, Ophthalmology 2000; Rimon, J Pediatr Ophthalmol Strabismus 2008), the ambulatory-IV preseptal evidence (Brugha & Abrahamson, Pediatr Emerg Care 2012), the conservative-IV-then-escalate series (Šuchaň, Cesk Slov Oftalmol 2014), and the corticosteroid-evidence Cochrane review (Kornelsen, Cochrane 2021). AAO/Wills-aligned. No 2024-2026 society guideline supersedes the Chandler septum frame. — PMID:5470225
Cited evidence (PMID 31935029) — PMID:31935029
Cited evidence (PMID 3312114) — PMID:3312114
Cited evidence (PMID 32987452) — PMID:32987452
Cited evidence (PMID 28452841) — PMID:28452841