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Higher power magnification (hematoxylin and eosin stain x80). Distinct features of transitional cell carcinoma were noted on microscopy with focal squamous differentiation (nonkeratinising cell carcinoma) High grade in situ carcinoma extended superiorly along both lacrimal canaliculi and inferiorly along the nasolacrimal duct. All margins were clear with appearance of complete excision.
