Figure 1: (a) Gross photograph revealed partially exophytic mass lesion surrounded by thick capsule. The cut surface is brownish in color with tiny cystic spaces. (b) Thick capsule with smooth muscle fibers, entrapped blood vessels and tubules was seen separating the lesion (upper left corner) from normal kidney (lower right corner) [H&E 4×]. (c) Follicular cystic spaces forming the predominant component of tumor, lined by single layer of flattened to atrophic epithelial cells with small sized, normochromatic nuclei [H&E 10×]. (d) Two types of atrophic tubular structures – endocrine type and thyroidization type – were seen between the follicular cystic spaces [H&E 40×]. (e) Two types of calcifications were seen, dystrophic and psammomatous within the cysts and cyst wall [H&E 40×]