Areas of uncertainty in endophthalmitis care

Table 1 Domains of diagnostic uncertainty in endophthalmitis

Domain	Key sources of uncertainty	Clinical implications
Clinical	(1) Overlap in presenting features between infective and non-infective intraocular inflammation; (2) Variable severity at presentation (early, indolent, or partially treated infections); (3) Atypical presentations in immunocompromised or elderly patients; and (4) Rapid inflammatory responses in toxic or immune-mediated conditions mimicking infection	(1) Clinical severity alone cannot reliably distinguish infection from sterile inflammation; (2) Risk of delayed treatment in true infection or overtreatment in non-infective cases; and (3) Necessitates probabilistic decision-making rather than binary diagnosis
Microbiological	(1) High rates of culture negativity despite clinically presumed infection; (2) Prior antibiotic exposure reducing yield; (3) Fastidious or low-virulence organisms; (4) PCR positivity without viable organisms; and (5) Unclear significance of low microbial DNA copy numbers	(1) Absence of culture growth does not exclude infection; (2) PCR results require cautious interpretation and clinical correlation; and (3) Microbiological data often lag behind therapeutic decision-making
Imaging	(1) B-scan ultrasonography lacks specificity for infective vs sterile vitritis; (2) OCT findings reflect secondary inflammatory damage rather than etiology; (3) Widefield imaging documents extent but not cause of inflammation; and (4) Limited ability to predict microbial virulence or disease trajectory	(1) Imaging serves as an adjunct rather than a diagnostic arbiter; (2) Risk of over-interpreting nonspecific structural changes; and (3) Imaging cannot replace clinical and microbiological synthesis
Systemic/etiologic context	(1) Absence of identifiable ocular breach does not exclude infection; (2) Presence of a breach does not exclude toxic or immune-mediated reactions; (3) Subclinical or occult systemic infections; and (4) Masquerade syndromes (e.g., vitreoretinal lymphoma)	(1) Difficulty distinguishing endogenous infection from non-infective masquerade syndromes; (2) Requires parallel systemic evaluation and longitudinal reassessment; and (3) Misclassification may lead to inappropriate therapy or delayed diagnosis

PCR: Polymerase chain reaction; OCT: Optical coherence tomography.