Tumor neuroendocrino: descripción de 2 casos de evolución atípica / Neuroendocrine TumorWith an Atypical Clinical Course: A Description of 2 Cases

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Carcinoma verrugoso facial. Descripción de dos casos / Verrucous Carcinoma of the Face: A Report of 2 Cases

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[Low grade astroblastoma: pathological and magnetic resonance findings]. / Astroblastoma de baixo grau: Achados patológicos e da ressonância magnética.

INTRODUCTION: The astroblastoma is an uncommon type of glial tumour. It accounts for less than 1% of all tumours of the central nervous system. It originates in the tanicytes, ependymal cells present in the embryo and usually seen in adolescents and young adults. Radiologically it presents as a well delimited, heterogeneous tumour with a solid component which takes up contrast and is cystic, giving the same signal as cerebrospinal fluid (CSF). The pathological characteristics are of the formation of radial astroblastic pseudorosettes with perivascular hyalinization. CASE REPORT: An 18 year old woman presented with a 15 month history of motor deficit of her right limbs with occasional left frontal headache and horizontal diplopia on looking towards the left. On examination there was minimal claudication of the right limbs and bilateral papilloedema. Magnetic resonance showed a very well circumscribed left prefrontal neoplasm of heterogeneous aspect, with areas of solid and cystic appearance in the different sequences. The area of cystic appearance did not show the CSF signal in all sequences of the pulse. The tumour was totally excised. On histological study there were radial astroblastic pseudorosettes with perivascular hyalinization, with two mitoses per 10 fields of great magnification and the final diagnosis was of low grade astroblastoma. The apparently cystic portion was composed of friable gelatinous tissue. Fifteen months after her operation the patient is still asymptomatic. CONCLUSION: We report the radiological and pathological findings of a low grade astroblastoma.

Astroblastoma de bajo grado: hallazgos patológicos y en resonancia magnética / Low grade astroblastoma: pathological findings and on magnetic resonance

Introducción. El astroblastoma es un tumor de estirpe glial muy poco frecuente. Constituye menos del 1 por ciento de todas las neoplasias del sistema nervioso central. Tiene su origen en los tanicitos, células ependimarias presentes en edad embrionaria y suele aparecer en adolescentes y adultos jóvenes. Radiológicamente se presenta como una tumoración bien delimitada, heterogénea, con componente sólido que capta contraste y quístico con señal idéntica a la del líquido cefalorraquídeo (LCR). Patológicamente se caracteriza por la formación de pseudorrosetas astroblásticas radiales con hialinización perivascular. Caso clínico. Mujer de 18 años con un cuadro de 15 meses de evolución de un déficit motor de extremidades derechas acompañada ocasionalmente de una cefalea frontal izquierda y de diplopía horizontal en la mirada a la izquierda. La exploración mostró una mínima claudicación de extremidades derechas y un edema de papila bilateral. La resonancia reveló una neoplasia prefrontal izquierda muy bien circunscrita de aspecto heterogéneo con áreas de apariencia sólida y quística en las diferentes secuencias. El área de apariencia quística no tenía la señal del LCR en todas las secuencias de pulso. El tumor fue resecado de forma completa. Patológicamente se caracterizaba por la formación de pseudorrosetas astroblásticas radiales con hialinización perivascular con dos mitosis por 10 campos de gran aumento y el diagnóstico final fue de astroblastoma de bajo grado. La porción aparentemente quística correspondía a tejido gelatinoso friable. La paciente permanece asintomática 15 meses después de la intervención. Conclusión. Presentamos los hallazgos radiológicos y patológicos de un astroblastoma de bajo grado (AU)

Haemolytic-uraemic syndrome with thrombotic microangiopathy of the retina following cytomegalovirus infection: postmortem findings.

Haemolytic-uraemic syndrome is characterized by thrombotic microangiopathy of the glomeruli and smaller arterial vessels of the kidney. Extrarenal thrombotic microangiopathy occurs, but ocular involvement is rarely demonstrated microscopically. We describe a 33 year old woman with a 3 week febrile episode and seropositivity for cytomegalovirus infection who developed acute renal failure, blindness and severe encephalopathy which was the cause of death. Thrombotic microangiopathy of retinal vessels may be more common than is expected from the literature. The exclusion of ocular structures in postmortem examinations explains the lack of anatomoclinical correlation.

[Rosai-Dorfman disease of the mesenteric lymph nodes and appendix. Secondary to salmonellosis?]. / Enfermedad de Rosai-Dorfman en ganglios mesentéricos y apéndice. Secundaria a salmonelosis?

A 28 year-old female patient was operated for acute abdominal pain. At the surgical intervention the mesenteric nodes turned out to be enlarged and the appendix was apparently normal. Microscopically, the changes observed were of the Rosai-Dorfman disease type in the appendix as well as in the nodes. A salmonella D was cultivated in the mesenteric nodes. This association, which has not been described in the literature, permits us to comment clinicopathological aspects, poorly defined, with special reference to the possibility that some instances of Rosai-Dorfman disease could be secondary to an infectious process.