Fig. 1

Histological findings of the abdominal masses at the insulin injection sites in two cases (Cases 2 and 5). A figure set (a, b, c, and d) was obtained from Case 2, and another set (e, f, g, and h) was obtained from Case 5. The masses are stained with Congo red (a and e) and viewed under a crossed polarized field (b and f). Insulin is detected using immunostaining with anti-insulin antibody (c and g). Serum amyloid P component (SAP) is detected in almost the same area immunoreacted with insulin (d and h). Original magnification, 400 x; bar, 100 μm