MUC5AC and squamous cell intraepithelial neoplasia: Stratified mucin-producing intraepithelial lesion (SMILE) is a rare cervical precancerous lesion exhibiting architectural features encompassing cellular stratification similar to squamous intraepithelial lesions (SIL), crowding, an increased nuclear/cytoplasmic ratio, hyperchromasia, mitoses and apoptosis.