Due to poor air quality, the Academy San Francisco offices will be closed Friday, Nov. 16. 

  • Courtesy of Michele Bloomer, MD.
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    Ocular Pathology/Oncology

    Epithelioid melanoma cells (400×, H&E). These cells resemble epithelium because of abundant eosinophilic cytoplasm and enlarged round to oval-shaped nuclei. Epithelioid melanoma cells often lack cohesiveness and demonstrate marked pleomorphism, including the formation of multinucleated tumor cells (arrow). Nuclei have a conspicuous nuclear membrane, very coarse chromatin, and large nucleoli. Note the balloon cells (arrowheads).