Soft tissue myoepithelial carcinoma: is it a low-grade cancer? / Carcinoma mioepitelial de partes moles: um tumor de baixo grau de malignidade?

ABSTRACT Myoepithelial carcinoma is a rare neoplasm of very heterogeneous manifestation that represents a major challenge to the adoption of categorical prognostic criteria since, despite being classified as a low-grade cancer, it behaves very aggressively. While several studies have indicated complete surgical resection as the best treatment for myoepithelial carcinoma, adjuvant therapies have proven effective in preventing relapse. This study describes the case of a patient who developed myoepithelial carcinoma in the right thigh, affecting deep tissues, which were conducted as indicated in the current literature, however, presenting an unfavorable outcome. The available information comes from few studies; therefore, we emphasize the importance of gathering data on the subject, which are still scarce.

RESUMEN El carcinoma mioepitelial es una neoplasia rara, de manifestación muy heterogénea, que encierra un gran desafío para la adopción de criterios pronósticos categóricos, puesto que, a pesar de ser clasificado como tumor de bajo grado de malignidad, muestra comportamientos muy agresivos. Mientras varios estudios indican la resección quirúrgica completa como el mejor tratamiento para el carcinoma mioepitelial, terapias adyuvantes se han revelado efectivas para prevenir la recidiva. Este estudio describe el caso de una mujer que presentó carcinoma mioepitelial en muslo derecho, afectando partes profundas, lo cual fue conducido como indica la literatura actual, sin embargo, con un resultado desfavorable. Las informaciones disponibles son producto de pocos estudios, por ello, destacamos la importancia de reunir datos acerca del tema, que aún son escasos.

RESUMO O carcinoma mioepitelial é uma neoplasia rara, de manifestação muito heterogênea, que encerra um grande desafio na adoção de critérios prognósticos categóricos, uma vez que, apesar de ser classificado como tumor de baixo grau de malignidade, apresenta comportamentos muito agressivos. Enquanto vários estudos indicam a ressecção cirúrgica completa como o melhor tratamento para carcinoma mioepitelial, terapias adjuvantes têm-se revelado efetivas na prevenção da recidiva. Este estudo descreve o caso de uma paciente que desenvolveu carcinoma mioepitelial em coxa direita, acometendo partes profundas, o qual foi conduzido como indica a literatura atual, contudo, apresentando desfecho desfavorável. As informações disponíveis provêm de poucos estudos, logo, ressaltamos a importância de reunir dados a respeito do tema, que ainda são escassos.

Primary central nervous system peripheral T-cell lymphoma in a child.

A 10-year-old Caucasian boy was admitted to the hospital with a 3-month history of headache, vomiting, ataxia, and right amaurosis. A magnetic resonance imaging (MRI) showed a solid, expansive, parasagittal mass in the right parietal hemisphere that extended sagitally to include the optical chiasm. The lesion was considered unresectable. Histology and immunophenotyping of biopsy tissue revealed characteristics of peripheral T-cell lymphoma. No other anatomical region, including bone marrow, was compromised. Primary T-cell lymphomas of the central nervous system are rare, especially in childhood. Here, we describe the rapidly deteriorating and fatal clinical course of a boy with a primary T-cell lymphoma in the central nervous system.

Desmoplastic small round cell tumor of the kidney mimicking Wilms tumor: a case report and review of the literature.

Desmoplastic small round cell tumor (DSRCT) is a rare, aggressive, malignant neoplasm usually present with the widespread abdominal serosal involvement and affects mainly adolescents and young adults. When presenting within visceral organs, as kidney, the diagnosis of DSRCT imposes significant difficulties. We present a case of primary DSRCT of the kidney in a 10-year-old boy mimicking clinically and pathologically Wilms tumor. The tumor showed morphologic and immunohistochemical features of DSRCT and the presence of the Ewing sarcoma and Wilm tumor 1 fusion transcripts resulting from the t(11;22) (p13;q12) reciprocal translocation. DSRCT should be considered in the differential diagnosis of Wilm tumor and other small blue-round cell tumors of the kidney.

[Polycystic hydatidosis: casual finding of calcified hydatid cyst simulating mesenteric neoplasm]. / Hidatidose policística: cisto hidático calcificado, simulando neoplasia mesentérica, descoberto acidentalmente.

A case of abdominal hydatidosis, without hepatic involvement, in a patient from the State of Acre is reported. The hydatid, already in degeneration and partially calcified, was discovered incidentally by a radiologic examination of the vertebral column, carried out for evaluating the state of an intervertebral disk prolapse. Although the images suggested a mesenteric tumor, attached to the intestinal wall, the finding of rostellar hooklets in the dense contents of the cyst, after surgical removal, revealed the parasitic nature of the lesion.

Hidatidose policística: cisto hidático calcificado, simulando neoplasia mesentérica, descoberto acidentalmente / Polycystic hydatidosis: casual finding of calcified hydatid cyst simulating mesenteric neoplasm

É descrito um caso de hidatidose abdominal, sem comprometimento hepático, em paciente do Estado do Acre. O cisto, já em degeneraçäo e parcialmente calcificado, foi descoberto, por acaso, mediante estudo radiológico da coluna vertebral feito para avaliaçäo de hérnia de disco, detectada algum tempo antes. Embora as imagens sugerissem uma neoplasia do mesentério, o achado de acúleos rostelares no conteúdo pastoso da hidátide, removida cirurgicamente, permitiu reconhecer-se a natureza parasitária da lesäo