case_images: PMC6327337_01
case_images: Severely alopecic and lichenified head at the time of presentation
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case_images: Physical examination showed partial-to-complete alopecia, erythema, crusting, excoriations, multiple papules and intense pruritus of the head, face and ventral neck (Figures 1 and 2).
case_images: Complete alopecia with coalescing erythematous papules affecting the ventral neck at presentation
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case_images: Physical examination showed partial-to-complete alopecia, erythema, crusting, excoriations, multiple papules and intense pruritus of the head, face and ventral neck (Figures 1 and 2).
case_images: Hematoxylin and eosin photomicrograph (x 10) showing perivascular-to-diffuse monomorphic mast cells infiltrating the superficial dermis and a moderately acanthotic epidermis
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case_images: Large numbers of well-differentiated monomorphic mast cells with fewer eosinophils diffusely infiltrated the superficial dermis (Figure 3).
case_images: Hematoxylin and eosin photomicrograph (x 20) reveals numerous monomorphic mast cells diffusely infiltrating the superficial dermis
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case_images: The mast cells were randomly distributed throughout the dermis though some were located perivascularly (Figure 4).
case_images: Nearly complete hair regrowth on the head, face and neck 8 weeks after initiating treatment
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case_images: The cat continued to improve over the next 4 weeks, other than an increase in pruritus when medications were discontinued during a 4 day period while the owner was away (Figure 5).