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Abstract Background: Mucopolysaccharidosis type II, also known as Hunter syndrome, is a rare X-linked recessive disorder caused by deficiency of the lysosomal enzyme Iduronate-2- Sulfatase (IDS), leading to progressive accumulation of Glycosaminoglycans (GAGs) in several organs. Over the years, Enzyme Replacement Therapy (ERT) has provided significant benefits for patients, retarding the natural progression of the disease. Results: The authors evaluated 17 patients from the same family with a mild form of MPS type II; the proband had developed acute decompensated heart failure refractory to clinical measurements at 23 years and needed a rather urgent heart transplant; however, he died from surgical complications shortly after the procedure. Nevertheless, subsequent to his tragic death, 16 affected male relatives were detected after biochemical tests identifying the low or absent activity of the IDS enzyme and confirmed by molecular analysis of the IDS gene. Following diagnosis, different options of treatment were chosen: 6 patients started ERT with Elaprase® (Idursulfase) soon after, while the other 10 remained without ERT. Eventually, 4 patients in the latter group began ERT with Hunterase® (Idursulfase Beta). None presented adverse effects to either form of the enzyme. Among the 6 individuals without any ERT, two died of natural causes, after reaching 70 years. Despite the variable phenotype within the same family (mainly heart dysfunctions and carpal tunnel syndrome), all 14 remaining patients were alive with an independent lifestyle. Conclusion: Here, the authors report the variable progress of the disease with and without ERT in a large Brazilian family with a slowly progressive form of MPS II, harboring the same missense variant in the IDS gene.
RESUMEN
OBJETIVO: Sistematizar os achados radiológicos dos pacientes com mucopolissacaridose VI atendidos na Unidade de Genética e no Serviço de Diagnóstico por Imagem do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo. MATERIAL E MÉTODO: Cinco pacientes com mucopolissacaridose VI (dois meninos e três meninas) foram incluídos no estudo, e em todos foi realizado estudo radiológico completo. RESULTADOS: A idade variou de oito anos e um mês a 20 anos e cinco meses (idade média de 14 anos e dois meses). Os achados radiológicos observados em todos os pacientes foram: macrocefalia, fechamento precoce das suturas, costelas " em forma de remo", fossa glenóidea hipoplásica, úmero proximal "em forma de machado", teto acetabular hipoplásico e irregular, colo femoral afilado, ossos do carpo pequenos e irregulares. CONCLUSÃO: Os pacientes apresentaram achados radiológicos compatíveis com a doença. O paciente de maior idade, em estágio mais evoluído, apresentou achados mais acentuados, comprovando ser uma doença progressiva. O estudo radiológico é um auxílio para o diagnósltico e evolução clínica.
OBJECTIVE: To systematize the radiological findings in patients diagnosed with mucopolysaccharidosis VI examined at the Genetic Unit and at the Image Diagnostic Service of "Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo". MATERIAL AND METHOD: Five patients with mucopolysaccharidosisVI (two boys and three girls) were included in this study. A complete X-Ray survey was performed in all patient. RESULTS: The patients age rangedfrom 8y1mo to 20y5mo (mean age 14y2mo). The radiological findings observed in all patients were: macrocephaly, premature closure of the sutures, oar shaped ribs, hypoplastic glenoid fossae, hatchet-like aspect of the proximal humerus, irregular and hypoplastic acetabular roofs, thin femoral neck and small and irregular carpal bones. CONCLUCION: The radiographic findings seen on patients were consistent with the disease. Marked findings that confirmed the progression of the disease were seen in the oldest patient with the most advanced stage of the disease. X-ray survey was an important supportive method for the diagnosis and follow-up of clinical progress.