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(A) The core needle biopsy shows a microfollicular proliferative lesion and surrounding normal tissue. (B) The high-power view of the boxed area in Fig. 4A shows that the lesion has no nuclear atypia or fibrous capsule. This lesion should be diagnosed as a benign follicular nodule. (C, D) When microfollicular proliferative lesions show a definite fibrous capsule (arrows) in the core needle biopsy, the specimens should be diagnosed as a follicular neoplasm.
