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Schema of the four parameters (size, a; intervascular transparency, b; distribution of intra-epithelial papillary capillary loop (IPCL), c; shape of IPCL, d) for the differential diagnosis of basal cell hyperplasia (BCH) and squamous cell carcinoma (SCC). BCH tend to have the features on the left side of the schema, whereas SCC tend to have those on the right side.
