PMC6333058_01
A, Tender ill-defined erythematous indurated subcutaneous plaques on posterior left thigh and right popliteal fossa; B, After treatment, the lesions improved and became hyperpigmented 1859 x 821 mm (72 x 72 DPI)
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A 68-year-old Thai man with 1 year of ankylosing spondylitis suddenly developed tender erythematous skin eruptions on both thighs for two weeks (Figure 1A). His panniculitis was improved (Figure 1B) upon increasing the dosage of prednisolone to 30 mg per day.
The histopathology from left thigh showed (A) lobular panniculitis with sparse cells infiltration (Hematoxylin-eosin staining, x4) (B) lymphocytic and histiocytic infiltrations with some foci of lipomembranous change (Hematoxylin-eosin staining, x40) 541 x 203 mm (150 x 150 DPI)
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The result showed lobular panniculitis with sparse lymphocytic and histiocytic infiltrations with foci of lipomembranous changes (Figure 2).