Fig. 4From: Atypical parathyroid adenoma: clinical and anatomical pathologic featuresa Ki-67+ > 4%: immunohistochemical staining for Ki-67 underlines the high mitotic rates of APA (MIB/Ki-67, × 40 original magnification). b Ki-67+ < 4%: immunohistochemical staining for Ki-67 underlines the low mitotic rates of TA (MIB/Ki-67, × 40 original magnification)Back to article page