Figure 5

(a) "Mucosal" reaction pattern of CHC in a skin flap. Here, the loss of orthokeratinisation and overall appearances of epidermis (E) and papillary dermis could be described as "psoriasiform mucosalisation". Deep dermal and subcutaneous features as in Fig. 4a. (b) The "psoriasiform features" are better appreciated on higher magnification. Note the tube-like epidermal rete, attenuated suprapapillary plates (arrowhead) and elongated dermal papillae that contain hyperaemic capillary-sized vessels (arrow). The area in rectangle corresponds to that shown in Fig. 5c. (c)This is higher magnification and from an adjacent section stained with PAS. The arrowheads indicate individual hyphae infiltrating parakeratinised layers. The densely stained elements in the lower part of the photomicrograph are emigrating neutrophils.