The American Journal of dermatopathology
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The presence of dermal mitotic figures is helpful in identifying malignant melanocytic lesions but occasionally occur in benign nevi. We aim to determine a "benchmark" mitotic frequency for a wide variety of nevi. We prospectively collected 1041 cases of benign melanocytic nevi and reviewed them for the presence of mitotic figures. ⋯ The most common body site among cases with mitotic figures was trunk (53.7%), whereas the body site with the largest proportion of nevi demonstrating mitotic figures was special site (10.9%). The percentage of nevi containing mitotic figures was nearly the same among female (7.9%) and male (7.8%) participants. Results of this large review confirm that mitotic figures, even multiple ones, do not preclude benignity in a variety of melanocytic nevi.
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Case Reports
Nonuremic calciphylaxis associated with histologic changes of pseudoxanthoma elasticum.
Calciphylaxis is a rare condition characterized by medial calcification of small- and medium-sized vessels that subsequently leads to ischemic necrosis. Calciphylaxis most often occurs in patients with end-stage renal disease and secondary hyperparathyroidism. ⋯ In addition, our case demonstrated not only calciphylaxis but also fragmentation and calcification of elastic fibers within the dermis, changes that are most often seen in pseudoxanthoma elasticum. This is the first reported case of calciphylaxis, to our knowledge, with histopathologic changes of pseudoxanthoma elasticum in a patient who is nonuremic.