Figure 20.1 Onychomycosis of fingernails Clinical Differential Diagnosis (Friable nail) Psoriatic nail Bacteria infection Fungal/Yeast infection Mixed fungal and bacteria infection Lichen planus Pachyonchia Congenita Histopathology The nail clipping was…
Figure 16.1 Posterior neck showing folliculitis (Sycosis nuchae) Clinical Differential Diagnosis Folliculitis Adnexal tumor Cysts Acne keloidalis Diagnosis FOLLICULITIS is defined as inflammation of the pilosebaceous unit (Fig. 16.2). Clinically,…
Figure 26.1 Mucicarmine stain, 1,000×, Cryptococcus neoformis, numerous organisms stain slight reddish with mucoid, thick capsule Cryptococcus is a yeast-like organism that is transmitted by inhalation of infected organisms. Once…
Figure 17.1 Erythrasma Clinical Differential Diagnosis Tinea versicolor Inverse psoriasis Candidiasis Erythrasma Histopathology A shave biopsy of the outer groin was performed which measured 0.7 × 0.3 × 0.1 cm (Specimen A). The Periodic…
Figure 5.1 Herpes Zoster, note the dermatome distribution Figure 5.2 Herpes zoster, vesicles themselves appear the same as herpes simplex Figure 5.3 Herpes Zoster, note the grouped vesicles in this…
Figure 10.1 Kaposi sarcoma presents as a brownish purple nodule Clinical Differential Diagnosis Lymphoma Leukemia Metastatic malignancy Angiosarcoma Kaposi sarcoma Infection Histopathology A 4 mm punch biopsy was performed on…
Figure 8.1 Condyloma acuminata on patient’s penile shaft Clinical Differential Diagnosis Epidermal nevus Seborrheic keratosis Condyloma acuminata Condyloma lata Histopathology A shave biopsy was performed on the patient’s penile shaft….
Figure 13.1 Impetigo, a “honey crusted” covering an erythematous base Clinical Differential Diagnosis Impetigo Contact dermatitis Scabies Candidiasis Diagnosis IMPETIGO (bacterial) is a common infection of the skin that is…
Figure 6.1 Molloscum contagiosum Clinical Differential Diagnosis Milia cyst Pyogenic granuloma Sebaceous hyperplasia Molloscum contagiosum Keratoacanthoma Papular granuloma annulare Fungal infections Histopathology The biopsy specimen from the left cheek measured…
Figure 12.1 H&E 40×, ORF Figure 12.2 H&E 100×, ORF There are reported cases of Orf infection triggering erythema multiforme, secondary bacterial infections, generalized papular or morbilliform reactions, as well…
