case_images: PMC11341394_01
case_images: Photos of the patient's right hand. (A) Pre-treatment, the patient's right middle finger joint showed an irregular plaque with scales. (B) Post-treatment, the patient's right middle finger joint rash had mostly flattened.
case_images: fmed-11-1433153-g0001.jpg
case_images: PMC11341394_01_fmed-11-1433153-g0001.jpg
case_images: F1
case_images: Dermatological examination revealed an irregular plaque with scales on the extensor side of the right middle finger joint (see Figure 1A). With an additional 2 weeks of treatment, the rash substantially receded (see Figure 1B), with no recurrence observed for 1-year follow-up.
case_images: The pathology photograph of the dorsal aspect of the right middle finger joint. (A) Hyperplasia of the squamous epithelium of the epidermis with hyperkeratosis. H&E, magnification, 40X (B) superficial dermal acute inflammation with localized abscess formation and extensive lymphocytic infiltration. H&E, magnification, 100X (C, D) high magnification of acid-fast stained pathological tissue sections from the right middle finger joint showing curved red bacilli.
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case_images: PMC11341394_01_fmed-11-1433153-g0002.jpg
case_images: F2
case_images: The histopathology of the right middle finger joint's extensor side revealed hyperplastic squamous epithelium with hyperkeratosis. The superficial dermis showed acute inflammation with localized abscess formation and extensive lymphocytic infiltration (see Figures 2A, B). Figures 2C, D). After 10 days of incubation, colonies emerged. Following a week of sub-culturing on
case_images: (A) Rough colonies grown on Columbia blood agar. (B) Colonies were subcultured on Lowenstein-Jensen solid medium and incubated at 28 C for 7 days, resulting in the development of yellow colonies under light exposure.
case_images: fmed-11-1433153-g0003.jpg
case_images: PMC11341394_01_fmed-11-1433153-g0003.jpg
case_images: F3
case_images: Columbia blood aga rough, flattened, yellow-fleshy colonies were observed (see Figure 3A). Colonies were sub-cultured on Lowenstein-Jensen solid medium and incubated at 28 C for 7 days, resulting in the development of yellow colonies under light exposure (see Figure 3B).