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Figure 6–8. KOH preparation of fungus demonstrating pseudohyphae and budding yeast forms. (Reproduced, with permission, from Nicoll D et al. Guide to Diagnostic Tests, 7th ed. McGraw-Hill, 2017.) A diagram of the K O H preparation of fungus. Branches of pseudohyphae release budding yeast forms.

Current Medical Diagnosis & Treatment 2025 > Fungal Infections of the Skin

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eFigure 6–21. Branching hyphae at 40× power from a KOH preparation of tinea corporis without using a fungal stain. (Reproduced with permission from Richard P. Usatine, MD, in Usatine RP, Smith MA, Mayeaux EJ Jr, Chumley HS. The Color Atlas and Synopsis of Family Medicine, 3rd ed. McGraw-Hill, 2019.) A micrograph shows thin, white, tubular, branching, translucent hyphae.

Current Medical Diagnosis & Treatment 2025 > Fungal Infections of the Skin

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eFigure 6–22. A: Tinea corporis covering the buttocks and not showing areas of central clearing. Note how the color is silver rather than pink in this dark skinned individual. The differential diagnosis includes psoriasis, so a KOH prep was performed, and it was positive to confirm the diagnosis of tinea. B: Tinea corporis covering the back and showing well-demarcated borders. C: Tinea corporis with pustules and scale. KOH preparation was positive for branching hyphae. The pustules are a manifestation of an inflammatory response to the dermatophyte infection. (Reproduced with permission from Richard P. Usatine, MD, in Usatine RP, Smith MA, Mayeaux EJ Jr, Chumley HS. The Color Atlas and Synopsis of Family Medicine, 3rd ed. McGraw-Hill, 2019.) Three photos show the appearance of tinea corporis on different parts of the body.

Current Medical Diagnosis & Treatment 2025 > Tinea Corporis or Tinea Circinata

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eFigure 6–22. A: Tinea corporis covering the buttocks and not showing areas of central clearing. Note how the color is silver rather than pink in this dark skinned individual. The differential diagnosis includes psoriasis, so a KOH prep was performed, and it was positive to confirm the diagnosis of tinea. B: Tinea corporis covering the back and showing well-demarcated borders. C: Tinea corporis with pustules and scale. KOH preparation was positive for branching hyphae. The pustules are a manifestation of an inflammatory response to the dermatophyte infection. (Reproduced with permission from Richard P. Usatine, MD, in Usatine RP, Smith MA, Mayeaux EJ Jr, Chumley HS. The Color Atlas and Synopsis of Family Medicine, 3rd ed. McGraw-Hill, 2019.) Three photos show the appearance of tinea corporis on different parts of the body.

Current Medical Diagnosis & Treatment 2025 > Tinea Corporis or Tinea Circinata

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eFigure 6–22. A: Tinea corporis covering the buttocks and not showing areas of central clearing. Note how the color is silver rather than pink in this dark skinned individual. The differential diagnosis includes psoriasis, so a KOH prep was performed, and it was positive to confirm the diagnosis of tinea. B: Tinea corporis covering the back and showing well-demarcated borders. C: Tinea corporis with pustules and scale. KOH preparation was positive for branching hyphae. The pustules are a manifestation of an inflammatory response to the dermatophyte infection. (Reproduced with permission from Richard P. Usatine, MD, in Usatine RP, Smith MA, Mayeaux EJ Jr, Chumley HS. The Color Atlas and Synopsis of Family Medicine, 3rd ed. McGraw-Hill, 2019.) Three photos show the appearance of tinea corporis on different parts of the body.

Current Medical Diagnosis & Treatment 2025 > Tinea Corporis or Tinea Circinata

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eFigure 6–28. Inverse psoriasis in the groin is distinguished from Candida infections by history and KOH staining. Unlike tinea cruris, the scrotum is affected. (Used, with permission, from K Zipperstein, MD.) A photo shows pink discoloration and dry skin in the groin and scrotum of a patient.

Current Medical Diagnosis & Treatment 2025 > Tinea Cruris (Jock Itch)

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eFigure 6–36. Tinea versicolor diagnosed by KOH preparation. Note short hyphal elements and numerous spores not seen in KOH preparations of true dermatophytes. (Used, with permission, from S Goldstein, MD.) An image of a slide shows multiple stringed microorganisms and a dark circular ring.

Current Medical Diagnosis & Treatment 2025 > Tinea Versicolor (Pityriasis Versicolor)

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eFigure 20–16. Potassium hydroxide (KOH) preparation showing branched hyphae and budding yeast of Candida albicans. (Reproduced, with permission, from DeCherney AH, Nathan L, Laufer N, Roman S. Current Diagnosis & Treatment: Obstetrics & Gynecology, 12th edition. McGraw-Hill, 2019.) An image shows branched hyphae with patches on them.

Current Medical Diagnosis & Treatment 2025 > Vaginitis

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eFigure 33–1A. Pseudomembranous form of oral candidiasis is the most common; the white plaques over the hard palate raise the suspicion of underlying HIV/AIDS. They can be scraped off with a tongue blade, placed on a slide, and mixed with potassium hydroxide solution to make the diagnosis of Candida albicans (see eFigure 33–1C). (Reproduced with permission from Richard P. Usatine, MD, in Usatine RP, Smith MA, Mayeaux EJ Jr., Chumley H. The Color Atlas of Family Medicine, 2nd ed. McGraw-Hill, 2013.) The clinical appearance of oral candidiasis is shown with the pseudomembranous growth of Candida as a white plaque on the hard palate.

Current Medical Diagnosis & Treatment 2025 > HIV Infection & AIDS: Complications

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eFigure 33–1C. Photomicrograph of Candida albicans on potassium hydroxide (KOH) preparation. When an oral candidiasis lesion is scraped, added to a slide with KOH under a cover slip, and examined under low power microscopy, the pseudohyphae and/or budding yeast forms of C albicans are seen. (Reproduced with permission from Richard P. Usatine, MD, in Usatine RP, Smith MA, Mayeaux EJ Jr., Chumley H. The Color Atlas of Family Medicine, 2nd ed. McGraw-Hill, 2013.) A microscopic view of Candida albicans in K O H preparation. Several long, branched refractile filaments are visible in the microscopic field.

Current Medical Diagnosis & Treatment 2025 > HIV Infection & AIDS: Complications

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