RESUMO
OBJECTIVE: To investigate mean nuclear volume of cells in well-differentiated adenocarcinomas (20 cases) and carcinoma in situ (20 cases) of the gallbladder by the principle of estimation of the volume of particles with arbitrary shapes. STUDY DESIGN: Hematoxylin and eosin-stained, 4-micron-thick, vertical sections from formalin-fixed, paraffin-embedded tissue blocks were analyzed by using a projection microscope with a 100:1 oil immersion objective (NA 1.3); the final magnification was 2,500:1. The measurements were carried out in 10 microscopic fields for each slide. Mean nuclear volume was obtained by the stereologic method of point-sampled intercepts for vertical sections. RESULTS: Mean nuclear volume in well-differentiated adenocarcinomas (127.67 +/- 46.95 micron 3) was significantly larger than in carcinoma in situ (69.17 +/- 15.74 micron 3) (P < .000001). CONCLUSION: Stereologic estimation of mean nuclear volume may be helpful in the discrimination of malignant and borderline lesions of the gallbladder.
