Giant Papillary Conjunctivitis Workup
- Author: Barry A Weissman, OD, PhD, FAAO; Chief Editor: Hampton Roy Sr, MD more...
Histologic Findings
Quantitative histologic findings with either VKC or giant papillary conjunctivitis suggest multiple abnormalities.
Neutrophils and lymphocytes are usually present only in the conjunctival epithelium and substantia propria, whereas both mast cells and plasma cells are present in the substantia propria but not the epithelium. Basophils and eosinophils are not usually found in either tissue. However, in giant papillary conjunctivitis, degranulating mast cells are found in the epithelium, and both eosinophils and basophils are found in the epithelium and substantia propria. The predominant normal skin (and small intestine) subtype of mast cell, or mast cell with both tryptase and chymase (MCtc), is found in patients with giant papillary conjunctivitis, whereas the mast cell subtype with only tryptase (MCt), which is usually the predominant subtype of mast cell in the lung, is found in the substantial propria of the conjunctiva in VKC.[12] Also, MCt depends on T lymphocytes, whereas MCtc does not.
Although the density of inflammatory cells may not change much between healthy patients and patients with giant papillary conjunctivitis, the increase in tissue mass due to the disease means that the number of inflammatory cells doubles.[13]
Common tear abnormalities found in giant papillary conjunctivitis include elevated levels of histamine,[14] immunoglobulin G (IgG), IgE, and immunoglobulin M (IgM),[15] as well as complement factors, such as C3, factor B, and C3 anaphylatoxin.[16]
Decay-accelerating factor, which inhibits C3 amplification in the complement cascade, is decreased in patients with giant papillary conjunctivitis,[17] whereas lactoferrin (also present in VKC) is increased,[18, 19] as is neutrophilic chemotactic factor,[20] leukotriene,[21] and eotaxin, a chemokine that attracts eosinophils.[22]
Zhong et al also found that the membranous epithelial cells (M cells) that participate in the binding, uptake, and translocation of antigens in mucosa associated lymphoid tissue (MALT) overproliferate during the course of this disease and, in addition to increased lymphocytes, give rise to the conjunctival changes in giant papillary conjunctivitis.[23]
These multiple changes, regardless of whether the initiating insult is mechanical or immunologic, document the substantial inflammatory activities that result in the clinical picture of contact lens–associated giant papillary conjunctivitis.
Approach Considerations
No laboratory studies are necessary for the diagnosis of giant papillary conjunctivitis. However, some authors advocate screening patients who wear contact lenses for increased levels of immunoglobulin E (IgE) in their tears.
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