Malignant glomus tumor of the index finger

Glomus tumor (GT) is a benign mesenchymal tumor with an estimated incidence of 1.5 to 2% of soft tissue tumors. The majority of glomus tumors are benign and are mostly seen in the superficial skin & soft tissue of upper and lower distal extremity. The malignant variant of the glomus tumor is scarce. We report a case of a recurrent glomus tumor diagnosed in a 28-year-old male patient, who complained of painful swelling in the proximal phalanx of the right index finger. The magnetic resonance imaging of the hand revealed a well-defined multilobulated soft tissue mass at the palmar aspect of the 2nd digit along the shaft of the proximal phalanx. Histopathology revealed a well-circumscribed tumor arranged in solid sheets, nests and cords interconnect by vessels of varying size. The tumor cells were round to oval, showed moderate nuclear pleomorphism, eosinophilic cytoplasm, atypical mitoses (>5/10HPF), and necrosis. Immunohistochemically tumor cells reveal diffuse and strong cytoplasmic positivity with smooth muscle actin (SMA). Based on histomorphology and immunohistochemistry, a final diagnosis of malignant glomus tumor was made. We report this case due to its rarity, and it to be included among the differential if the lesion is painful and recurrent.

Angioma en penacho / Tufted angioma

El Angioma en Penacho es un raro tumor vascular de la infancia, que comparte características con el hemangioendotelioma kaposiforme, teniendo ambos posibilidad de desarrollar Síndrome de Kasabach-Merrit. Presentamos una paciente portadora de un angioma en penacho desde el nacimiento, que hemos seguido por 13 años: clínicamente, con estudios de imágenes y biopsias. El caso presenta similitudes con la literatura, con algunas interesantes peculiaridades en su evolución. Consideramos que por el comportamiento clínico e histológico, el Angioma en Penacho es parte de la misma enfermedad que el Hemangioendotelioma Kaposiforme.

Tufted angioma is a rare vascular tumor of childhood that shares features with the Kaposiform hemangioendothelioma, having both tumors the possibility of developing Kasabach-Merrit phenomenon. We report the case of a patient with a tufted angioma since birth, which we have followed for 13 years: clinically, with imaging studies and biopsies. The case presents similarities with literature, with some interesting peculiarities in its evolution. We consider that because of the clinical and histological behavior, Tufted angioma is a part of the same disease that Kaposiform hemangioendothelioma.

Hemangiopericitoma de órbita / Orbital hemangiopericytoma

Hemangiopericitomas são tumores raros originados a partir da proliferação de pericitos, ou seja, células que envolvem os capilares. São encontrados em ossos, pulmões, crânio, partes moles profundas ou membros inferiores, principalmente na coxa. É considerado um tumor com potencial de malignidade incerto e quando afeta a região orbitária pode apresentar um comportamento biológico agressivo, com grande chance de recidiva. O objetivo deste trabalho é relatar um caso de hemangiopericitoma orbital e destacar suas características clínicas, cirúrgicas e histopatológicas. Usualmente, os hemangiopericitomas da órbita são tumores sólidos, únicos e de crescimento lento. Devem ser lembrados no diagnóstico diferencial dos tumores orbitários bem delimitados, como cistos epidermoides, schwannomas, neurofibromas, fibro-histiocitomas, lipomas e malformações vasculares. A confirmação diagnóstica é realizada pelo exame anatomopatológico e, por vezes, complementada pelo estudo imuno-histoquímico. O tratamento deve ser realizado com exérese completa do tumor, com margens amplas, sendo a radioterapia e a quimioterapia reservadas para casos de lesões reincidentes.

Hemangiopericytomas are rare tumors arising from the proliferation of pericytes. They may be found in the lungs, bones, skull, deep soft tissue or limbs. The tumor has an unpredictable prognosis and when it affects the orbital region, may have an aggressive behavior, with high incidence of recurrence. We report a case of orbital hemangiopericytoma and highlight clinical, surgical, and histopathological features of these tumors. Orbital hemangiopericytomas usually are solid, slow-growing tumors. They should be considered in the differential diagnosis of well-defined orbital masses along with epidermoid cysts, schwannomas, neurofibromas, fibrous histiocytomas, lipomas, and vascular malformations. The diagnosis is confirmed by anatomopathologic examination and sometimes complemented by immunohistochemistry. Complete excision of the tumor with wide margins is usually curative; however, radiotherapy and chemotherapy may be required for recurrent lesions.

Inhibición del crecimiento tumoral en ratones induciendo coagulación selectiva de los vasos tumorales / Inhibition of tumor growth in mice by selective coagulation of tumors vessels

El presente estudio se basó en el hecho de que el factor tisular (TF), la proteína humana inductora de la coagulación es el principal disparador de la coagulación sanguínea. El objetivo de este trabajo fue demostrar en un modelo animal la factibilidad de tratar tumores sólidos humanos activando la coagulación e inhibiendo el crecimiento tumoral mediante infarto del mismo. Demostrar que el factor tisular truncado(tTF) recupera su capacidad inductora de la coagulación In vitro como In vivo y que fusionado al péptido RGD (tTF-RGD) en su carbono terminal hace blanco en marcadores de la angiogenesis presentes en el endotelio vascular tumoral no así en tejidos normales, como un novedoso abordaje en cáncer. Utilizando para la investigación dos líneas tumorales humanas (M21 y CCL-185) xenotransplantadas cada una en grupos de 24 ratones cada vez y distribuidos en grupos de 8 cada uno para las terapias con tTF-RGD, tTF y solución salina, respectivamente; En conclusión este trabajo muestra por primera vez que la caracterización específica del tTF-RGD en su carbono terminal le permite activar la coagulación selectiva, trombosis e infarto del tejido tumoral, inhibiendo en 100% el crecimiento de tumores humanos en ratones y sin efectos adversos significativos...

inguinal mass with local vascular lesions induced by a lymphatic filaria

A 47-year-old Indian male presented with an inguinal mass clinically suspicious as a tumor. Histological examination of the excised mass demonstrated tissue reaction to degenerating intravascular adult filarial worms. The worms have been identified as a lymphatic filariae, most probably Wuchereria bancrofti. The case report underscores the need to maintain suspicion of genitourinary filarial lesions in non-endemic areas and describes atypical vascular lesions induced by lymphatic filariae