Tumoral melanosis is a histological term used to refer to a nodular accumulation of melanophages in the dermis, which clinically arises as a pigmented lesion. It is usually associated with the regression of melanomas or of other melanocytic lesions. The authors present the case of a 45-year old man/woman with a pigmented macule on his/her left leg. The lesion was completely excised and diagnosed as a tumoral melanosis.

Keywords: MELANOMA; SKIN NEOPLASMS; DERMATOSCOPY

Dermatofibrosarcoma protuberans is an uncommon and relapsing fibrohistiocytic tumor of intermediate malignancy. Its rarest variant is known as atrophic, morphea type or dermatofibrosarcoma non protuberans and its clinical diagnose is difficult. There are not well established dermatoscopic criteria, so the diagnosis is histopathologic. There are advances in immunohistochemical and genetic that help the diagnosis and complete surgical excision. It is reported a case of atrophic dermatofibrosarcoma in a 27 years patient ant it is reviewed the clinical, dermoscopic, histological and genetic aspects.

Keywords: DERMOSCOPY; NEOPLASMS; DERMATOFIBROSARCOMA

Porokeratoma is an entity defined as an acanthoma with porokeratosis characteristics. It has a distinct histological pattern from that of the cornoid lamella and has clinical differences regarding the typical porokeratosis. The condition has been described only recently and there are few cases reported in the literature. The authors report the case of a 46 year-old male patient with an exophytic nodular lesion located in the intergluteal region. Histological examinations evidenced multiple cornoid lamellae, with those located on the periphery being better defined. Based on the clinical and histological appearance, the lesion was diagnosed as a porokeratoma.

Keywords: Acanthoma; Keratosis; Porokeratosis

BACKGROUND: Sentinel Lymph Node (SLN) status has been shown to be the strongest independent prognostic factor of cutaneous melanoma (CM) stage I-II patients. Few papers on CM at private clinics (PC) are available.
OBJECTIVE: To present clinical and histologic data, complications and frequency of SLN involvement in CM patients diagnosed and followed at a dermatology/cutaneous oncology PC in São Paulo/Brazil, who were submitted to SLNB.
METHODS: Retrospective, single-center cohort of patients who attended PC from June 1998 to Jan 2020. Electronic files were selected and analyzed. Minimum period for considering the patient eligible was 1 year.
RESULTS: 215 CM lesions were identified in 184 patients(1.2 melanoma/patient). Forty-seven patients (25.5%) were submitted to SLNB and 59 SLN for histologic examination (1.2 SLN/patient). 10,9% tested positive. SLN identification happened in 95.7%. In 38/47 (80,8%) patients single LBD was found, while multiple-LBD was found in 9/47(19.1%). Eighteen(72,0%) out of 25 trunk lesions drained to single basin, while in 7 patients multiple LBD was found. Complication rate was 6,0%.
CONCLUSION: Percentage of CM patients that undergo SLNB, node positivity for metastasis, draining basins and complications in this study were similar to studies in northern hemisphere patients. Clinical and epidemiologic characteristics of CM patients differ markedly between PC and PHS patients.

Keywords: Biopsy; Melanoma; Sentinel lymph node