FNA Quiz 32 A 53-year-old woman on treatment for biopsy-proven small cell carcinoma of the lung was discovered to have a 6.0 cm right ovarian mass and a CT-guided fine needle aspiration biopsy of the mass was performed and illustrated below. Immunohistochemical studies performed on the cell block revealed that the tumor cells were positive for thyroid transcription factor-1 and negative for both cytokeratin 20 and WT1. Based on these findings, the BEST diagnosis is:

A Granulosa cell tumor of the ovary.

B Primary small cell carcinoma of the ovary.

C Metastatic small cell carcinoma of the lung.

D Metastatic Merkel cell carcinoma of the skin.

E Primitive neuroectodermal tumor of the ovary.