2.  Which of the following immunostains is positive on most cases of sex cord–stromal tumors?

  3.  An 8-year-old girl presents with precocious puberty, and a pelvic ultrasound reveals a right ovarian mass. The histologic appearance of the tumor is shown in this picture. What is the diagnosis?

  4.  A syndrome characterized by an ovarian tumor, ascites, and right pleural effusion is typically associated with:

  5.  This photomicrograph shows an ovarian neoplasm from a postmenopausal woman presenting with abnormal uterine bleeding. Which of the following immunohistochemical or special stains is most useful in differentiating this neoplasm from adult granulosa cell tumor?

  6.  A 25-year-old woman with menstrual irregularities undergoes resection of an ovarian tumor whose histologic appearance is shown in this picture. These features are most consistent with:

  7.  The ovarian tumor shown in this picture is most frequently associated with production of:

  8.  This photomicrograph demonstrates the most significant histopathologic findings in a 4-cm tumor located in the ovarian hilus and associated with clinical signs of virilization. Which of the following is the most likely diagnosis?

  9.  An ovarian dysgerminoma contains scattered isolated foci of glandlike structures immunoreactive for alpha-fetoprotein (AFP) and keratin. This immunohistochemical pattern is evidence of differentiation toward: