Clinical assessment of upper airway and its complications in Hunter syndrome.

BACKGROUND: Hunter syndrome (HS) is an X-linked, recessive, lysosomal storage disease caused by a deficiency of the lysosomal enzyme, iduronate sulfatase (IDS). It is characterized by multisystem accumulations of glycosaminoglycans and upper airway obstruction is one of the major causes of death. While the current disease severity classifications for HS are mainly based on the degree of neurocognitive impairment, its association with the level of upper airway obstruction has not been assessed. METHODS: A retrospective chart review of HS patients who were followed at the Jikei University School of Medicine was performed. Association between the degree of airway obstruction and the currently used disease severity scores was evaluated. RESULTS: We identified eight HS patients and they were enrolled in the study. The Modified Mallampati classification (MMC) score, used to predict difficulties for oropharyngeal procedures, was significantly correlated with the HS severity. It was also correlated with the Apnea-Hypopnea Index (AHI). No significant correlation between IDS enzymatic activity and the severity of HS disease was identified. CONCLUSIONS: Variable clinical expressivities exist in HS, but the risk of respiratory complications is likely to be associated with disease severity, assessed by the previously recognized neurocognitive function-based severity scoring systems. MMC can be a simple supplementary tool to evaluate disease severity as well as predict difficulties for oropharyngeal procedures and respiratory function complications in HS, such as sleep apnea.

Genetic Profile and Microsatellite Instability in a Case of Secondary Esophageal Squamous Cell Carcinoma 12 Years After Allogeneic Hematopoietic Stem Cell Transplantation for Aplastic Anemia.

We report on a 16-year-old Japanese boy in whom an esophageal squamous cell carcinoma (ESCC) developed 12 years after allogeneic hematopoietic stem cell transplantation was performed for aplastic anemia. A high frequency of microsatellite instability was detected in samples of ESCC. Moreover, the detection of pathogenic variants, including single nucleotide substitution of TP53 (c.346C>T) and BRCA2 (c.6952C>T) and splicing of KDM6A (c.1194+2T>G), suggest that the development of ESCC in the patient was triggered by impairment of checkpoint and repair for DNA damage and epigenetic modification through accumulation of gene mutations induced by chronic graft-versus-host disease and prolonged administration of tacrolimus.

Atypical clinical features of children with central nervous system tumor: Delayed diagnosis and switch in handedness.

Herein is described the cases of three children with central nervous system (CNS) tumor, who had switch in handedness occurring before diagnostic confirmation. Although the onset, age, tumor location, and histology were heterogeneous, the diagnosis of CNS tumor was delayed in all three patients. The present experience indicates that switch in handedness should be recognized as a sign of CNS tumor in pediatric patients, and which might prevent delay in diagnosis. Pediatricians should carefully examine such patients who present with some suggestive symptoms of CNS tumor, even when they are unusual, in order to make a timely and appropriate diagnosis.

[Maternal Crohn's disease-related vitamin B12 deficient megaloblastic anemia in an infant].

We report an 11-month-old breast-fed boy with feeding difficulties, lethargy, and developmental delay. Blood examination showed pancytopenia and decreased serum levels of vitamin B12. Anisocytosis and poikilocytes were detected in his peripheral blood, and increased megaloblastosis without leukemic cells was detected in his bone marrow. After the diagnosis of megaloblastic anemia due to vitamin B12 deficiency, symptoms were improved by vitamin B12 administration. Further investigation of the mother identified Crohn's disease and suggested that the supply of vitamin B12 from the mother to the infant, via the placenta during pregnancy and via breast milk after birth, was decreased due to impaired absorption of vitamin B12 in the mother's small intestine. Magnetic resonance imaging of the boy's brain on admission showed cerebral cortex atrophy which had improved by the age of 1 year and 10 months after vitamin B12 treatment, though developmental delay was still evident at the age of 3 years. Infantile vitamin B12 deficiency often presents with nonspecific manifestations, such as developmental delay and failure to thrive, in addition to anemia and is thus not easily diagnosed. To prevent severe neurological sequelae, this condition must be rapidly diagnosed, because a prolonged duration increases the risk of permanent disabilities.

Somatic mosaic mutations of IDH1 and NPM1 associated with cup-like acute myeloid leukemia in a patient with Maffucci syndrome.

Maffucci syndrome is a nonhereditary congenital disorder characterized by multiple enchondromas and with soft-tissue hemangiomas. Somatic mutations of the isocitrate dehydrogenase (IDH) gene have been detected in enchondroma and hemangioma tissue from patients with Maffucci syndrome. The rate of malignant transformation in Maffucci syndrome is high, with enchondromas transforming into chondrosarcomas and the development of secondary neoplasms, including pancreatic and hepatic adenocarcinoma, mesenchymal ovarian tumors, and brain tumors such as glioma. However, hematopoietic malignancies arising in Maffucci syndrome are rare. We report a 7-year-old girl with Maffucci syndrome in whom acute myeloid leukemia (AML) with cup-like nuclear invagination developed. Both leukemic cells and hemangioma had the same gene mutations: an insertion frameshift c.863_864insTCTG (p.W288 fs) in the nucleophosmin (NPM1) gene and a missense mutation c.392_395GTCG > CTCT (p.G131_R132 > AL) in the IDH1 gene. However, buccal mucosa cells and peripheral blood mononuclear cells harvested after two cycles of chemotherapy showed wild-type genotypes. These results suggest that the multiple somatic mutations of the IDH1 and NPM1 genes in hemangioblasts are related to the development of cup-like AML associated with Maffucci syndrome. However, further studies are needed to identify additional molecular events in AML but not in hemangioma.

Paraneoplastic Syndrome of Angiomatoid Fibrous Histiocytoma May Be Caused by EWSR1-CREB1 Fusion-induced Excessive Interleukin-6 Production.

We describe a 7-year-old girl with angiomatoid fibrous histiocytoma (AFH) presenting severe inflammatory symptoms. The cytokine/chemokine profile of serum samples before and after surgery demonstrated that interleukin (IL)-6 had decreased by the greatest percentage. The AFH cells were immunopathologically positive for IL-6 and Tyr705-phosphorylation of signal transducer and activator of transcription 3. The EWSR1-CREB1 fusion gene detected in the tumor leads to continuous activation of CREB1 and IL-6 production, because the promoter region of IL-6 has a CREB binding site. Thus, IL-6 plays pivotal roles in both paraneoplastic syndrome and the oncogenesis of AFH.

Effect of donor chimerism to reduce the level of glycosaminoglycans following bone marrow transplantation in a murine model of mucopolysaccharidosis type II.

Mucopolysaccharidosis type II (MPS II) is a lysosomal storage disorder caused by deficient activity of the iduronate-2-sulfatase. This leads to accumulation of glycosaminoglycans (GAGs) in the lysosomes of various cells. Although it has been proposed that bone marrow transplantation (BMT) may have a beneficial effect for patients with MPS II, the requirement for donor-cell chimerism to reduce GAG levels is unknown. To address this issue, we transplanted various ratios of normal and MPS II bone marrow cells in a mouse model of MPS II and analyzed GAG accumulation in various tissues. Chimerism of whole leukocytes and each lineage of BMT recipients' peripheral blood was similar to infusion ratios. GAGs were significantly reduced in the liver, spleen, and heart of recipients. The level of GAG reduction in these tissues depends on the percentage of normal-cell chimerism. In contrast to these tissues, a reduction in GAGs was not observed in the kidney and brain, even if 100 % donor chimerism was achieved. These observations suggest that a high degree of chimerism is necessary to achieve the maximum effect of BMT, and donor lymphocyte infusion or enzyme replacement therapy might be considered options in cases of low-level chimerism in MPS II patients.

Multidisciplinary therapy including proton beam radiotherapy for a Ewing sarcoma family tumor of maxillary sinus in a 4-year-old girl.

BACKGROUND: Although complete resection offers the best chance for controlling head and neck Ewing sarcoma family tumors (ESFTs), it is occasionally unfeasible because of possible functional and cosmetic side effects. Planning multidisciplinary treatment for head and neck ESFT is challenging. METHODS AND RESULTS: A 4-year-old girl had left-sided excessive tearing, nasal obstruction, and exophthalmos for 4 months. A CT scan showed a mass filling the left maxillary sinus and extending to the left orbital wall. After a diagnosis of ESFT was established with biopsy, the patient was treated with vincristine, doxorubicin, cyclophosphamide/ifosfamide etoposide (VDC/IE) regimen over 50 weeks; partial maxillectomy was performed at week 15 and was followed by proton radiotherapy. The patient has remained tumor-free for 16 months, with preservation of facial form and function. CONCLUSION: Partial resection combined with proton radiotherapy may enable maximal tumor control and minimal functional and cosmetic side effects in children with head and neck ESFT.

[Diagnosis of mild hemophilia A made by massive intraabdominal bleeding in a 13-year-old boy].

We report a 13-year-old boy who had massive intra-abdominal bleeding without a history of bleeding episodes or traumatic cause of bleeding. The patient underwent surgical treatment because bleeding was not controlled after treatment with tranexamic acid and transfusions including fresh-frozen plasma. Bleeding was traced to the lower left lobe of the liver. The mother's side of the family had a history of bleeding episodes in the boy's grandfather, great uncle, and son of a great aunt. A low level of plasma factor VIII coagulant activity (22%) led to a diagnosis of mild hemophilia A. Compared with severe hemophilia, mild hemophilia is more difficult to diagnose because bleeding episodes are less frequent. Most cases are found after incidental trauma or uncontrolled surgery-related bleeding, there is rarely a family history of hemophilia and activated partial thromboplastin time is normal or slightly prolonged. However, bleeding episodes in mild hemophilia may result in excessive, sometimes life-threatening hemorrhage and require early diagnosis and replacement treatment with adequate amounts of factor VIII, as in severe hemophilia.

[Recurrence of transient splenial lesions in a child with "benign convulsions with gastroenteritis"].

We report a 2-year-old girl who demonstrated "benign convulsions with gastroenteritis (CwG)" with transient splenial lesions twice during the winter. The first episode was associated with noro-virus and the second with rota-virus. During each episode, seizures occurred in clusters without clinical signs of dehydration, hypoglycemia, electrolyte derangement or cerebrospinal fluid abnormalities, and her consciousness was clear during the interictal period. Those findings were consistent with CwG. As transient splenial lesions were not accompanied by any neurological abnormalities other than seizures, she was not diagnosed as having encephalopathy, but as having CwG. Diffusion-weighted magnetic resonance imaging of the brain demonstrated hyperintense lesions in the splenium of the corpus callosum, which disappeared within a week. We speculate that CwG is likely to lead to transient splenial lesions.

Differences in CTG triplet repeat expansion in leukemic cells and normal lymphocytes from a 14-year-old female with congenital myotonic dystrophy.

We describe a rare case of acute lymphoblastic leukemia in a 14-year-old female with congenital myotonic dystrophy manifested as mental retardation, extensive contractures of multiple joints of the lower extremities, and severe scoliosis. Because of the potential toxicity of chemotherapy and the patient's poor performance status, a modified chemotherapy regimen was administered. Analysis of the greatly expanded number of CTG repeats at the 3' untranslated region of DMPK gene showed that the number of repeats was 233 greater in leukemic cells than in normal lymphocytes; this elongation may have occurred during the cellular proliferation of leukemic clones.

Sequential analysis of cadherin expression in a 4-year-old girl with intracranial ependymoma.

INTRODUCTION: Cadherins are Ca(2+)-dependent cell-to-cell adhesion molecules that play an important role in tissue construction and morphogenesis in multicellular organisms. Cadherin involvement in tumor metastasis has recently been reported. CASE REPORT: We investigated the expression of E-cadherin and N-cadherin in paraffin-embedded sequential surgical specimens and autopsy specimens from a 4-year-old girl with recurrent ependymoma, subsequent to cerebrospinal fluid (CSF) dissemination. We observed low expression of E-cadherin in all surgical specimens and autopsy specimens. In contrast, expression of N-cadherin was high in all surgical specimens, but was decreased in autopsy specimens. CONCLUSION: Decreased expression of N-cadherin may be associated with CSF dissemination and may serve as a useful marker for CSF dissemination in patients with intracranial ependymoma.

Lymphocytic hypophysitis with central diabetes insipidus and subsequent hypopituitarism masking a suprasellar germinoma in a 13-year-old girl.

CASE REPORT: We report a case of central diabetes insipidus, hypothyroidism, and subsequent hypopituitarism due to lymphocytic hypophysitis masking a germinoma in a 13-year-old pubertal girl. Magnetic resonance revealed an enlarged pituitary gland and a mass lesion in the pituitary stalk and inferior hypothalamus. Open cranial surgery of the anterior pituitary showed active hypophysitis with lymphocytic infiltrates but without necrosis. Despite prednisolone therapy, 1 year later an enlarged, irregular cystic mass lesion had developed; in the pituitary stalk and inferior hypothalamus, a endoscopic biopsy revealed germinoma. CONCLUSION: Lymphocytic hypophysitis in children may be the first sign of a host reaction to an occult germinoma. The diagnosis of central diabetes insipidus with a thickened pituitary stalk requires long-term follow-up to establish the underlying cause.

Hemoglobin Hammersmith [beta 42(CD1) Phe --> Ser] causing severe hemolytic anemia in a Japanese girl.

Hemoglobin Hammersmith, a rare, unstable hemoglobin variant, was diagnosed in a 9-year-old Japanese girl. She presented with the typical manifestations of this disorder, including neonatal hyperbilirubinemia, followed by progressive hepatosplenomegaly, jaundice, and bilirubinuria. Because of severe hemolytic anemia, she received transfusions of red blood cells every 3 to 4 weeks. However, she underwent splenectomy at the age of 4 years and has continued to be in partial remission without requiring further transfusions. DNA sequence analysis of the polymerase chain reaction-amplified beta-globin gene revealed a point mutation (T --> C) in the second nucleotide of the 42nd codon of the beta-globin chain (beta 42(CD1) Phe --> Ser).