Design, Ground Testing and On-Orbit Performance of a Sun Sensor Based on COTS Photodiodes for the UPMSat-2 Satellite.

This paper presents the development of the UPMSat-2 sun sensor, from the design to on-orbit operation. It also includes the testing of the instrument, one of the most important tasks that needs to be performed to operate a sensor with precision. The UPMSat-2 solar sensor has been designed, tested, and manufactured at the Universidad Politécnica de Madrid (UPM) using 3D printing and COTS (photodiodes). The work described in this paper was carried out by students and teachers of the Master in Space Systems (Máster Universitario en Sistemas Espaciales-MUSE). The solar sensor is composed of six photodiodes that are divided into two sets; each set is held and oriented on the satellite by its corresponding support printed in Delrin. The paper describes the choice of components, the electrical diagram, and the manufacture of the supports. The methodology followed to obtain the response curve of each photodiode is simple and inexpensive, as it requires a limited number of instruments and tools. The selected irradiance source was a set of red LEDs and halogen instead of an AM0 spectrum irradiance simulator. Some early results from the UPMSat-2 mission have been analyzed in the present paper. Data from magnetometers and the attitude control system have been used to validate the data obtained from the sun sensor. The results indicate a good performance of the sensors during flight, in accordance with the data from the ground tests.

Cutaneous metastasis of primitive neuroectodermal lung tumor.

Primary sarcomas of the chest are rare. Although primitive neuroectodermal tumor (PNET) usually develops in the chest wall, it has been described as a primary pulmonary tumor. We present an unusual case of PNET arising in the lung of an 89-year-old man.

Linfoma esplénico presentado como pancreatitis aguda en una paciente de 84 años: reporte de un caso / Splenic lymphoma presenting as acute pancreatitis in an 84 year-old patient. A case report

Se comunica el caso de una mujer de 84 años de edad, que ingresó en urgencias por un episodio de pancreatitis aguda alitiásica. En la investigación etiológica se documentó la presencia de un linfoma esplénico con efecto compresivo sobre la glándula pancreática. Tras la resolución de los síntomas, se programó para esplenectomía con buen resultado técnico. A los 6 meses del ingreso, la paciente presentaba un excelente estado clínico y funcional. Este caso destaca la inusual manifestación clínica de esta enfermedad hematológica y la necesidad de valorar todas las opciones terapéuticas disponibles en ancianos seleccionados(AU)

A case is presented of an 84 year-old woman who was admitted to the Emergency Department due to an episode of non-calculous acute pancreatitis. In the aetiological study, the presence of a splenic lymphoma was documented, which had a compressive effect on the pancreas. After resolving the symptoms, she was scheduled for a splenectomy with a good technical result. At six months after admission the patient was in an excellent clinical and functional condition. This case highlights the unusual clinical presentation of this haematological disease, and the need to evaluate all the available therapeutic options in selected elderly patients(AU)

PEComa en mucosa yugal. Presentación de un caso / PEComa of the jugal mucosa in an 8 year old boy: a case report

Los tumores de células perivasculares epitelioides (PEComas) son un grupo heterogéneo de tumores mesenquimales muy infrecuentes, de histogénesis y evolución incierta. Se incluyen el angiomiolipoma (AML), la linfangiomiomatosis (LAM), el tumor de células claras de pulmón (TCCP) y una variedad de tumores de vísceras y partes blandas morfológica e inmunofenotípicamente similares, caracterizados por expresar marcadores melanocíticos (HMB45 y/o Melan-A) y de músculo liso (actina y/o desmina). Se han publicado casos en gran variedad de órganos, tejidos blandos y hueso. En la cavidad oral solo ha sido descrito un único caso en el paladar duro. Se presenta el caso de un niño de 8 años con un PEComa en la mucosa oral de la mejilla. No hemos hallado un caso similar en la literatura(AU)

PEComas (Perivascular Epithelioid Cells tumours) are a group of rare mesenchymal tumours whose origins (or line of differentiation) and behaviour are not well defined. Angiomyolipoma (AML), lymphangiomyomatosis (LAM), clear cell gsugarh tumour of the lung (CCST), and a variety of lesions arising at both visceral and soft tissue sites with morphologically and immunophenotypically similar features are included in this group. The main characteristics in common are immunoreactivity for both melanocytic (HMB-45 and/or Melan-A) and smooth muscle (Actin and/or Desmin) markers. These tumours show a marked female predominance and are composed of nest and sheets of epithelioid but occasionally spindled cells with clear to granular eosinophilic cytoplasm. They have focal association with blood vessel walls. They have been reported at visceral sites but also in soft tissues and bone. Only one case in oral cavity arising in palatine mucosa has been described so far. We report a jugal mucosa PEComa in a 8-year-old boy. That is an uncommon location and, to our knowledge, itŒs the first case reported in this site to date(AU)

Lipoleiomiosarcoma en región paratesticular. Estudio de dos casos y revisión de la literatura / Lipoleiomyosarcoma in the paratesticular region. Presentation of two cases and a review of the literature

El lipoleiomiosarcoma corresponde a un liposarcoma bien diferenciado que muestra focalmente diferenciación hacia tejido muscular liso maduro con atipia. La localización característica es el retroperitoneo, aunque se han descrito casos en otras localizaciones, siendo raros en la región inguinal-paratesticular. El comportamiento de las lesiones es similar al liposarcoma bien diferenciado, siendo clave en el pronóstico de la lesión la localización y, en relación a esta, la posibilidad o no de extirpación quirúrgica completa. Presentamos dos casos de localización paratesticular y revisamos la literatura(AU)

Lipoleiomyosarcoma is a well differentiated liposarcoma with focal differentiation into mature smooth muscle with atypia. These tumours usually occur in the retroperitonum, although they have been reported in other locations. The inguinal paratesticular region is a rare site for these neoplasms. Their behaviour is similar to that of well differentiated liposarcomas. Their location and the possibility of complete surgical extirpation are key prognostic factors. Two cases of lipoleiomyosarcoma occurring in the paratesticular region are presented together with a review of the literature(AU)

Henoch-Schönlein nephritis associated with streptococcal infection and persistent hypocomplementemia: a case report.

INTRODUCTION: Henoch-Schönlein purpura is a systemic disease with frequent renal involvement, characterized by IgA mesangial deposits. Streptococcal infection can induce an abnormal IgA immune response like Henoch-Schönlein purpura, quite similar to typical acute post-infectious glomerulonephritis. Indeed, hypocomplementemia that is typical of acute glomerulonephritis has also been described in Henoch-Schönlein purpura. CASE PRESENTATION: We describe a 14-year-old Caucasian Spanish girl who developed urinary abnormalities and cutaneous purpura after streptococcal infection. Renal biopsy showed typical findings from Henoch-Schönlein purpura nephritis. In addition, she had low serum levels of complement (C4 fraction) that persisted during follow-up, in spite of her clinical evolution. She responded to treatment with enalapril and steroids. CONCLUSION: The case described has, at least, three points of interest in Henoch-Schönlein purpura: 1) Initial presentation was preceded by streptococcal infection; 2) There was a persistence of low serum levels of complement; and 3) There was response to steroids and angiotensin-converting enzyme inhibitor in the presence of nephrotic syndrome. There are not many cases described in the literature with these characteristics. We conclude that Henoch-Schönlein purpura could appear after streptococcal infection in patients with abnormal complement levels, and that steroids and angiotensin-converting enzyme inhibitor could be successful treatment for the disease.