After 1 year of follow-up, the patient has had no recurrences. In 1902, Michaelis and Gutmann 3 described 3 patients with bladder tumors. These tumors contained distinctive macrophages with intracellular inclusions. He then named the macrophages von Hansemann cells and the inclusions Michaelis-Gutmann bodies. Malacoplakia is a rare disorder that occurs most commonly in the immunocompromised patient.
Cutaneous involvement is infrequent and typically perianal.
The morphological features are varied and may appear as skin-colored, yellow, or pink abscesses or violaceous papules or nodules. Lesions often are ulcerated or may form sinus tracts that drain. Pathogenesis is unknown, although faulty bacterial killing by macrophages is suspected. The diagnosis is made by histopathologic studies that show an infiltrate of numerous Hansemann macrophages that contain Michaelis-Gutmann bodies. The natural history is usually benign, although a chronic protracted course can be expected.