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Light micrograph of a cervical smear, graded CIN 3 (severe dysplasia) showing a mass of fibre-shaped cells with elongated, cigar-shaped nuclei. The CIN grading refers to a spectrum of potentially cancerous changes (dysplasia) in the stratified squamous epithelium that lines the cervix. CIN 1 corresponds to mild dysplasia, CIN 2 to moderate dysplasia & CIN 3 to severe dysplasia & carcinoma- in-situ. In a normal squamous epithelium, cell division is confined to the basal layer; cells mature & rise towards the surface. Normal superficial cells are pink staining, with small nuclei. Dysplastic cells represent a disruption in the maturation process.
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