This case study is a consultation case with limited clinical history on a 79-year-old man with left pleural effusion. The thoracentesis-fluid cytology, smear, and cell block, are shown below. The tumor cells were positive for MOC-31 and BerEP4 (focal), and negative for calretinin, D2-40, and CDX-2 immunohistochemistry stains.
Subsequently, additional information became available as the patient was brought to Mayo Clinic for biopsy of the mass. The findings of this resection are shown below:
This quiz is no longer available.Simone Terra, M.D.
Resident, Anatomic and Clinical Pathology
Mayo Clinic
Diva Salomao, M.D.
Consultant, Division of Anatomic Pathology
Mayo Clinic
Professor of Laboratory Medicine and Pathology
Mayo Clinic College of Medicine and Sciences
Joanne (Eunhee) Yi, M.D.
Consultant, Division of Anatomic Pathology
Mayo Clinic
Professor of Laboratory Medicine and Pathology
Mayo Clinic College of Medicine and Sciences