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Fig. 3C —72-year-old man with stage pT1 gallbladder cancer, which was
overstaged as T2. Photomicrograph of histopathologic specimen reveals tumoral
extension (arrowheads) through Rokitansky-Aschoff sinuses
(asterisk). Involvement of Rokitansky-Aschoff sinuses indicates T1
lesion. However, tumor involvement of Rokitansky-Aschoff sinuses, which is
invaginated into muscular layer, may mimic T2 lesion. (H and E, x40)
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