RESUMEN

Tumoral calcinosis is an uncommon type of extraosseous calcification characterized by large rubbery or cystic masses containing calcium-phosphate deposits. The condition prevails in the periarticular tissue with preservation of osteoarticular structures. Elevated calcium-phosphorus products and severe secondary hyperparathyroidism are present in most patients with uremic tumoral calcionosis (UTC). Case report of an obese secondary to chronic glomerulonephritis, undergoing continuous ambulatory peritoneal dialysis (CAPD) reported the appearance of painless tumors in the medial surface of fifth finger and left arm. Tumoral calcinosis was confirmed by left biceps biopsy. Poor adherence to CAPD. The patient was transferred to the "tidal" modality of peritoneal dialysis and after was treated by hemodialysis, despite the persistence of severe hyperparathyroidism progressive reduction of UTC until near to its complete disappearance. Nowadays, one year after patient received deceased-donor kidney transplantation, he presents with an improvement in secondary hyperparathyroidism. UTC should be included in the elucidation of periarticular calcification of every patient on dialysis. Relevant laboratory findings such as secondary hyperparathyroidism and elevated calcium- phosphorus products in the presence of periarticular calcification should draw attention to the diagnosis of UTC.

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RESUMEN

Abstract Tumoral calcinosis is an uncommon type of extraosseous calcification characterized by large rubbery or cystic masses containing calcium-phosphate deposits. The condition prevails in the periarticular tissue with preservation of osteoarticular structures. Elevated calcium-phosphorus products and severe secondary hyperparathyroidism are present in most patients with uremic tumoral calcionosis (UTC). Case report of an obese secondary to chronic glomerulonephritis, undergoing continuous ambulatory peritoneal dialysis (CAPD) reported the appearance of painless tumors in the medial surface of fifth finger and left arm. Tumoral calcinosis was confirmed by left biceps biopsy. Poor adherence to CAPD. The patient was transferred to the "tidal" modality of peritoneal dialysis and after was treated by hemodialysis, despite the persistence of severe hyperparathyroidism progressive reduction of UTC until near to its complete disappearance. Nowadays, one year after patient received deceased-donor kidney transplantation, he presents with an improvement in secondary hyperparathyroidism. UTC should be included in the elucidation of periarticular calcification of every patient on dialysis. Relevant laboratory findings such as secondary hyperparathyroidism and elevated calcium- phosphorus products in the presence of periarticular calcification should draw attention to the diagnosis of UTC.

Resumo A calcinose tumoral é um tipo raro de calcificação extraóssea caracterizada por grandes massas císticas e elásticas contendo depósitos de fosfato de cálcio. A condição é mais prevalente no tecido periarticular e preserva estruturas osteoarticulares. A elevação do produtos cálcio-fósforo e o hiperparatireoidismo secundário grave estão presentes na maioria dos pacientes com calcinose tumoral urêmica (UTC). O relato de caso em questão refere-se a um homem de 22 anos, branco, obeso, com doença renal crônica secundária à glomerulonefrite crônica, em diálise peritoneal ambulatorial contínua (CAPD), que apresentou aparecimento de tumores indolores na face medial do quinto quirodáctilio e braço esquerdo. A calcinose tumoral foi confirmada por biópsia do bíceps esquerdo. O paciente apresentava baixa adesão à CAPD. Foi transferido para a modalidade de diálise peritoneal e depois iniciou tratamento por hemodiálise. Apesar da persistência do hiperparatireoidismo grave, houve redução progressiva da UTC, com resolução próxima do seu desaparecimento completo. Há 1 ano o paciente foi submetido a transplante renal, doador falecido, e apresentou melhora do hiperparatiroidismo secundário. A UTC deve ser incluída na elucidação de calcificação periarticular de pacientes em diálise. Os achados laboratoriais relevantes, tais como hiperparatiroidismo secundário e elevação dos produtos cálcio-fósforo na presença de calcificação periarticular, devem chamar a atenção para o diagnóstico da UTC.

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Se usó eritropoyetina recombinante humana (rh-EPO) -en 5 pacientes de 5 a 11 años de edad con insuficiencia renal crónica en tratamiento con hemodiálisis, todos con ferremia, ferritina y paratohormona sérica elevadas- por vía subcutánea, en dosis de 20 a 30 U*kg*dosis, 2 a 3 veces por semana, durante 3 a 6 meses, procurando alcanzar hematocrito de 30 vol% y hemoglobina de 10 g/dl. El hematocrito aumentó significativamente (p < 0,05), con incremento promedio semanal de 0,41 vol% (variación 0,33 a 0,55) en todos los pacientes. Dos pacientes se sometieron a trasplante renal al cuarto mes de tratamiento; otro fue retirado del estudio por hipertensión arterial y convulsiones al tercer mes de tratamiento, habiendo mejorado su hematocrito de 14 a 20 vol%. Las ferremias disminuyeron al término del tratamiento, pero la ferritina permaneció elevada. La dependencia de transfusiones mejoró en forma significativa (p < 0,05) en todos los pacientes. La cinética de la urea y el metabolismo del calcio y fósforo no se modificaron con el tratamiento. La composición corporal mejoró en todos los pacientes y significativamente en el área grasa. Un paciente hipertenso requirió incremento de la terapia antihipertensiva y en dos fue necesario aumentar la dosis de heparina en la diálisis. No hubo fenómenos de trombosis de fístula arteriovenosa ni equimosis secundaria a la punción. La rh-EPO es una excelente opción en el tratamiento de la anemia en pacientes en hemodiálisis

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