Papillary vs. Follicular Conjunctivitis -CEW

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====== Papillary vs. Follicular Conjunctivitis ======


===== Papillary Reaction =====

**Morphology:** Elevated, polygonal, flat-topped lesions with a central vascular tuft (fibrovascular core), giving a "cobblestone" or velvety appearance, most prominent on the superior tarsal conjunctiva where lid–globe friction is greatest.

**Histology:** Vascularized cores with a mixed inflammatory infiltrate (eosinophils, mast cells, lymphocytes, plasma cells) — reflecting an allergic/mechanical process.

**Typical causes:** Allergic disease (seasonal/perennial, vernal, atopic keratoconjunctivitis), giant papillary/contact lens–induced conjunctivitis from lens deposits, prostheses or exposed sutures, and chronic bacterial conjunctivitis. Giant papillae (>1 mm) are characteristic of vernal keratoconjunctivitis and GPC.

**Key associations:** Itching, ropy/mucoid discharge, and contact lens or atopy history.

===== Follicular Reaction =====

**Morphology:** Rounded, translucent-to-grayish, avascular elevations with vessels coursing around (not through) them, representing subepithelial lymphoid germinal centers; most prominent in the inferior fornix/lower tarsus (and characteristically upper tarsus in trachoma).

**Histology:** Lymphoid follicles with germinal centers — a lymphocytic response typical of viral and chlamydial infection and drug toxicity.

**Typical causes:** Viral (adenovirus most common), chlamydial (inclusion conjunctivitis and trachoma), toxic/medicamentosa (e.g., topical drug reactions), and Parinaud oculoglandular syndrome (e.g., Bartonella).

**Key associations:** Watery discharge, preauricular lymphadenopathy, and recent upper respiratory infection or sexual/STI history.

===== Causes by Reaction Pattern =====

^ Category                ^ Reaction Pattern  ^ Specific Causes                                                                                          ^
| Allergic                | Papillary         | Seasonal/perennial allergic conjunctivitis, vernal keratoconjunctivitis, atopic keratoconjunctivitis     |
| Mechanical/Immunologic  | Papillary         | Giant papillary/contact lens–induced conjunctivitis (lens deposits), ocular prosthesis, exposed sutures  |
| Infectious              | Papillary         | Chronic bacterial conjunctivitis (S. aureus, S. pneumoniae, H. influenzae, Moraxella)                    |
| Viral                   | Follicular        | Adenovirus (EKC, pharyngoconjunctival fever, nonspecific follicular conjunctivitis), other viruses       |
| Chlamydial              | Follicular        | Inclusion conjunctivitis (C. trachomatis D–K), trachoma (serotypes A–C)                                  |
| Toxic/Medicamentosa     | Follicular        | Chronic topical medication toxicity (e.g., antivirals, glaucoma drops, preservatives)                    |
| Granulomatous           | Follicular        | Parinaud oculoglandular syndrome (Bartonella henselae, tularemia, sporotrichosis)                        |

===== Clinical crossover =====
Some conditions produce a mixed picture — trachoma, for example, classically shows follicles but develops an intense papillary component when inflammation is florid.

===== References =====

  - [[https://pubmed.ncbi.nlm.nih.gov/32339665/|Kenny SE, Tye CB, Johnson DA, Kheirkhah A. Giant Papillary Conjunctivitis: A Review. The Ocular Surface. 2020;18(3):396-402]]
  - [[https://pubmed.ncbi.nlm.nih.gov/9988434/|Buckley RJ. Allergic eye disease – a clinical challenge. Clinical and Experimental Allergy. 1998;28 Suppl 6:39-43]]
  - [[https://pubmed.ncbi.nlm.nih.gov/27518840/|Solomon A. Allergic Manifestations of Contact Lens Wearing. Current Opinion in Allergy and Clinical Immunology. 2016;16(5):492-7]]
  - [[https://www.aao.org/education/preferred-practice-pattern/conjunctivitis-ppp-2023|American Academy of Ophthalmology. Conjunctivitis. AAO, 2024]]
  - [[https://pubmed.ncbi.nlm.nih.gov/33084033/|Kim SE, Nowak V, Quartilho A, et al. Systemic Interventions for Severe Atopic and Vernal Keratoconjunctivitis in Children and Young People Up to the Age of 16 Years. Cochrane Database of Systematic Reviews.2020;10:CD013298]]
  - [[https://pubmed.ncbi.nlm.nih.gov/40412861/|Habtamu E, Harding-Esch EM, Greenland K, et al. Trachoma. Lancet. 2025;405(10492):1865-1878]]
  - [[https://pubmed.ncbi.nlm.nih.gov/23797960/|Newman H, Gooding C. Viral ocular manifestations: a broad overview. Reviews in Medical Virology. 2013;23(5):281-94]]
  - [[https://pubmed.ncbi.nlm.nih.gov/26077630/|Jhanji V, Chan TC, Li EY, Agarwal K, Vajpayee RB. Adenoviral Keratoconjunctivitis. Survey of Ophthalmology. 2015 Sep-Oct;60(5):435-43]]
  - [[https://pubmed.ncbi.nlm.nih.gov/34136960/|Mueller A. Allergic Conjunctivitis: An Update. Handbook of Experimental Pharmacology. 2022;268:95-99]]
  - [[https://pubmed.ncbi.nlm.nih.gov/38127333/|Morales-Mancillas NR, Velazquez-Valenzuela F, Kinoshita S, et al. Definition and Diagnostic Criteria for Pediatric Blepharokeratoconjunctivitis. JAMA Ophthalmology. 2024;142(1):39-47]]