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Original article
Repeated applications of impression cytology to increase sensitivity for diagnosis of conjunctival intraepithelial neoplasia
  1. Ahmad Kheirkhah1,
  2. Mirgholamreza Mahbod2,
  3. Farzad Farzbod1,
  4. Mehdi Khodaparast Zavareh1,
  5. Mahmoud Jabbarvand Behrouz1,
  6. Hassan Hashemi1
  1. 1Farabi Eye Hospital, Eye Research Center, Tehran University of Medical Sciences, Tehran, Iran
  2. 2Noor Ophthalmology Research Center, Pathology Laboratory, Noor Eye Hospital, Tehran, Iran
  1. Correspondence to Ahmad Kheirkhah, Farabi Eye Hospital, Qazvin Square, South Kargar Street, Tehran 16366, Iran; akheirkh{at}yahoo.com

Abstract

Purpose To increase sensitivity of impression cytology (IC) for the diagnosis of conjunctival intraepithelial neoplasia (CIN) by three repeated applications of IC.

Methods This study included 35 eyes with a clinical diagnosis of CIN and 6 eyes with pinguecula as control. All eyes received IC by three consecutive applications of the cellulose acetate filter paper. All eyes in the CIN group had subsequent surgical excision with histopathological evaluation. The sensitivity of each application of IC for the diagnosis of CIN was determined.

Results In the control group, all IC specimens were negative for CIN. In the CIN group, with positive histopathology in all cases, the first IC was positive in 17 eyes (56.7%), showed atypical squamous cells indefinite for dysplasia (ASCID) in 8 (26.7%) and was negative in 5 (16.6%). The second application was positive in 25 eyes (83.3%), showed ASCID in 3 (10%) and was negative in 2 (6.7%). The third application was positive in 26 eyes (87.7%), showed ASCID in 3 (10%) and was negative in 1 (3.3%). The second application resulted in a statistically significant higher positive yield than the first application (p=0.009), with no significant difference between the second and the third applications (p=0.12).

Conclusion Consecutive repeated applications of filter paper significantly increased the diagnostic sensitivity of IC for the diagnosis of CIN.

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Footnotes

  • Competing interests None.

  • Ethics approval This study was conducted with the approval of the Eye Research Center, Farabi Eye Hospital.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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