HY USMLE Q #1348 – Pathology

A 58-year-old woman comes to the physician due to progressive weakness in her arms and thighs for the past 2 months. She also reports a red, scaly rash on the backs of her hands and upper chest that developed shortly after the weakness began. She has had decreased appetite and unintentional weight loss of 4 kg. Physical examination shows a violaceous rash over the eyelids and knuckles. She also has symmetric proximal muscle weakness. Serum CK is elevated. A CT scan of the abdomen and pelvis reveals a complex adnexal mass. Biopsy of the mass shows malignant epithelial cells with papillary structures and concentric calcifications. The calcific structures seen on histologic specimen in this patient are also seen in which of the following?