Abstract Background: Syphilis in its different phases may be a difficult diagnosis in clinical and histopathological grounds. Objectives: The present study objectives were to evaluate the detection and tissue distribution of Treponema pallidum in skin lesions of syphilis. Methods: A blinded diagnostic accuracy study was performed with immunohistochemistry and Warthin-Starry silver staining in skin samples from patients with syphilis and other diseases. Patients attended two tertiary hospitals between 2000 and 2019. Prevalence ratios (PR) and 95% confidence intervals (95% CI) were calculated for the association between immunohistochemistry positivity and clinical-histopathological variables. Results: Thirty-eight patients with syphilis and their 40 biopsy specimens were included in the study. Thirty-six skin samples were used as non-syphilis controls. The Warthin-Starry technique was unable to accurately demonstrate bacteria in all samples. Immunohistochemistry showed spirochetes only in skin samples from patients with syphilis (24/40) with 60% sensitivity (95% CI 44.8-75.2). Specificity was 100% and accuracy, 78.9% (95% CI 69.8-88.1). Most cases had spirochetes in both dermis and epidermis and there was a high bacterial load. Study limitations: Correlation between immunohistochemistry and clinical or histopathological characteristics was observed but was limited statistically due to the small sample size. Conclusions: Spirochetes were promptly seen in an immunohistochemistry protocol, which can contribute to the diagnosis of syphilis in skin biopsy samples. On the other hand, the Warthin-Starry technique showed to be of no practical value.

Abstract The concern about malignant skin neoplasms leads to the excision of smaller lesions. This study on small melanocytic lesions aims to evaluate the range of possible histopathological diagnoses, describe histopathological aspects, and assess the usefulness of serial histological sections. We performed a cross-sectional descriptive histopathological study examining 76 pigmented skin lesions up to 6 mm in diameter. Histopathological diagnoses included atypical melanocytic nevi (n=38), common melanocytic nevi (n=18), atypical lentiginous melanocytic hyperplasia with architectural features of atypical melanocytic nevi (n=7), lentigo simplex (n=2), and malignant melanoma (n=1). Ten cases were non-diagnostic. Cytological atypia was not an exclusive finding of atypical lesions. Examination of serial sections did not change histopathological impression. Early detection of malignant melanoma is important, but clinical and dermoscopy exams may be leading to the resection of a great number of benign lesions. Strict attention to histopathological criteria results in a large number of non-diagnostic cases.

Abstract: Pyoderma gangrenosum is a rare neutrophilic dermatosis, which usually presents as ulcers with erythematous-violaceous undermined edges and a rough base with purulent or sanguinous exudate. It can be primary or associated with an underlying disease. However, rare cases of its association with autoimmune hepatitis have been described in the literature. Diagnosis is based on a characteristic clinical picture and ruling out other causes of ulcers. This paper aims to discuss the management of corticosteroid therapy and the importance of local treatment. We report a case with torpid evolution, presented with multiple and deep ulcers in a young patient with autoimmune hepatitis, causing pain and significant disability. We observed complete healing of lesions after two months of successful treatment.

ABSTRACT Background Atypical presentations of cutaneous leishmaniasis include sporotrichoid leishmaniasis (SL), which is clinically described as a primary ulcer combined with lymphangitis and nodules and/or ulcerated lesions along its pathway. Aims To assess the differences between patients with sporotrichoid leishmaniasis and typical cutaneous leishmaniasis (CL). Methods From January 2004 to December 2010, 23 cases of SL (4.7%) were detected among 494 CL patients diagnosed at a reference center for the disease in Rio de Janeiro State, Brazil. These 23 cases were compared with the remaining 471 patients presenting CL. Results SL predominated in female patients (60.9%, p = 0.024), with older age (p = 0.032) and with lesions in upper limbs (52.2%, p = 0.028). CL affected more men (64.5%), at younger age, and with a higher number of lesions exclusively in lower limbs (34.8%). Conclusions Differences in clinical and epidemiological presentation were found between SL patients as compared to CL ones, in a region with a known predominance of Leishmania (Viannia) braziliensis. The results are similar to the features of most of the sporotrichosis patients as described in literature, making the differential diagnosis between ATL and sporotrichosis more important in overlapping areas for both diseases, like in Rio de Janeiro State.

Abstract: Methotrexate is one of the most used drugs in the treatment of psoriasis with indication of systemic therapy. Cutaneous and mucous side effects are described by pharmacological characteristics of the drug itself or due to overdose. We report the case of a patient with ulcerations in oral mucosa and psoriatic plaques after incorrect use of Methotrexate. Prescribed in a weekly dose, it was used continuously for 10 days and without simultaneous intake of folic acid. It is important to ensure correct comprehension of the prescription.

Abstract Lichen planus is a chronic inflammatory disease that affects the skin, mucous membranes, nails and scalp. Esophageal lichen planus is a rarely reported manifestation of lichen planus, presenting itself commonly in middle-aged women, with symptoms such as dysphagia. We report a case of esophageal lichen planus in a 54-year-old woman associated with oral, cutaneous and ungual lichen planus. Although lichen planus is a disorder well known by dermatologists, reports of esophageal lichen planus are rare in dermatologic literature. The esophageal lichen planus is little known and underdiagnosed, with a significant delay between the onset of symptoms and diagnosis.

Relatamos o caso de um paciente adulto, imunocompetente, com eumicetoma por Madurella mycetomatis, localizado nos glúteos e coxas, diagnosticado após 30 anos de evolução clínica. Tratado no decorrer de quatro anos com fluconazol e itraconazol, associado a cinco tempos cirúrgicos de exérese dos nódulos subcutâneos. No oitavo ano de follow-up ocorreu recidiva de apenas um nódulo na região infraglútea, o qual foi excisado cirurgicamente, mantendo-se assintomático desde então.

We report a case of eumycetoma by Madurella mycetomatis on the buttocks and thighs in an adult immunocompetent patient, diagnosed after 30 years of clinical development. He was treated over four years with fluconazol and itraconazol associated with five times surgical excisions of subcutaneous nodules. At the eighth year of follow-up, one nodule recurred on the right infragluteal region, which was excised surgically and has remained asymptomatic ever since.

Esporotricose é uma infecção fúngica subcutânea, adquirida por inoculação direta, causada pelo Sporothrix schenckii. Embora a apresentação clássica linfocutânea represente a maioria dos casos, as formas clínicas atípicas e graves têm aumentado em ocorrência. Esporotricose sistêmica e esporotricose cutânea disseminada são variantes raras, usualmente associadas à imunodeficiência celular ou a estados debilitantes. Relatamos o primeiro caso na literatura de lesões molusco-símiles em esporotricose cutaneomucosa múltipla. Os exames micológico direto e histopatológico apresentavam-se ricos em células leveduriformes.

Sporotrichosis is a subcutaneous fungal infection caused by Sporothrix schenckii and acquired by direct inoculation. Although the majority of cases consist of the classic lymphocutaneous presentation, the frequency of atypical and severe clinical forms of the disease has increased progressively. Systemic and disseminated cutaneous sporotrichosis constitute rare variants and such cases are generally associated with cellular immunodeficiency or debilitated states. The present paper describes the first published case of molluscum-like lesions in disseminated mucocutaneous sporotrichosis. Direct mycological examination and histopathology revealed numerous yeast cells.

The present study investigated the diagnostic value of polymerase chain reaction (PCR) performed in parallel to conventional methods at an American tegumentary leishmaniasis (ATL) referral centre for diagnosis. Accuracy parameters for PCR were calculated using 130 patients with confirmed ATL (ATL group), 15 patients established with other diseases and 23 patients with a lesion suggestive of ATL, but without parasitological confirmation (NDEF group). PCR showed 92.3% sensitivity, 93.3% specificity, a 99.2% positive predictive value and a 13.84 positive likelihood ratio. In the NDEF group, PCR confirmed ATL in 13 of the 23 patients, seven of whom responded to leishmaniasis treatment and six who presented spontaneous healing of the lesion. PCR should be included in the routine diagnostic procedures for ATL, especially for cases found to be negative by conventional methods.