1. 8 Sometimes histiocytes accumulate large amount to form a "nodule", named 'nodular histiocyte hyperplasia".

2. PP12 was mainly located in histiocytes found in the decidua, umbilical cord, amnion, and chorion.

3. 20 LL leprosydemonstrates a normal epidermis, subepidermal granulomas particularly aroundblood vessels, nerves, and skin appendages, foamy histiocytes, and manyintracellular acid-fast bacilli.

4. 5. The presence of oxyphilic inclusions (containing no DNA) in the nuclei and cytoplasm of fibroblasts, and in the nuclei of histiocytes.

5. Histological diagnosis is difficult, because tumors imbedded in large necrotic areas and neoplastic infiltrates may be admixed with small lymphocytes, plasma cells, eosinophils, and histiocytes, and thus the process could be misdiagnosed as chronic inflammation.