Fig. 2

Histological findings: Photomicrograph of resected specimen from brain metastases demonstrates cartilage compositions (a) (hematoxylin and eosin [HE] staining, × 100) and epithelial tumors (b) (cytokeratin AE1/AE3 staining, × 100). c, d Photomicrograph of HE and cytokeratin AE1/AE3 stained specimen demonstrates findings conformable with resected specimen from primary lung lesion (magnification, × 100)