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Biomedical subjects

Kieran McHugh

Publications and source records attributed to Kieran McHugh.

At least 19 recordsLinked to original sources

Diagnosis of aortic coarctation by tardus-parvus renal artery Doppler signal in an infant with multicystic dysplastic kidney: a case report.

We report an infant with known unilateral multicystic dysplastic kidney (MCDK) who underwent renal ultrasonography and Doppler spectral waveform analysis for investigation of hypertension. A tardus-parvus waveform was demonstrated in the renal artery on the normal side suggesting either renal artery or more proximal stenosis. Coarctation of the aorta was subsequently demonstrated.

Aortic Coarctation↗

2005 PRETEXT: a revised staging system for primary malignant liver tumours of childhood developed by the SIOPEL group.

Over the last 15 years, various oncology groups throughout the world have used the PRETEXT system for staging malignant primary liver tumours of childhood. This paper, written by members of the radiology and surgery committees of the International Childhood Liver Tumor Strategy Group (SIOPEL), presents various clarifications and revisions to the original PRETEXT system.

Child↗

CT findings in gastrocolic fistula following percutaneous endoscopic gastrostomy.

We describe the CT findings in an initially asymptomatic boy aged 2 years 9 months with a gastrocolic fistula following percutaneous endoscopic gastrostomy (PEG) placement. The findings consisted of an unusual configuration of the gastrostomy tubing on an abdominal radiograph and upper gastrointestinal study indicating the possibility of transcolic PEG placement, which was confirmed with limited section CT. This well-known and major complication following a common procedure may be recognized on plain abdominal radiography, but it has not to our knowledge been documented previously on CT in a child.

Gastric Fistula↗

Phase II study of temozolomide in relapsed or refractory high-risk neuroblastoma: a joint Société Française des Cancers de l'Enfant and United Kingdom Children Cancer Study Group-New Agents Group Study.

PURPOSE: To determine the response rate (RR) of neuroblastoma (NB) in children to temozolomide (TMZ), and evaluate the duration of response and tolerance of the drug in this patient population. PATIENTS AND METHODS: A multicenter, phase II evaluation of an oral, daily schedule of TMZ (200 mg/m2/d x 5 days every 28 days) was undertaken in children with refractory or relapsed high-risk NB (metastatic or localized with Myc-N amplification). Response assessment was based on imaging with two-dimentional measurement of disease and meta-iodobenzylguanidine (MIBG) score. Activity was defined by a reduction in lesion size or isotope uptake at anytime. Methodology included a two-step design using Fleming's method with a first step of 15 patients and a second of 10 additional patients if two to four responses had been observed in the first cohort. All data was centrally reviewed by a panel. RESULTS: Twenty-five assessable patients were recruited over a 14-month period in 14 centers and received 94 cycles of chemotherapy. Twenty-three patients had metastatic NB either refractory (n = 9) or in relapse (n = 14). Grade 3 or 4 thrombocytopenia was the most frequent toxicity (16% of cycles). Myelosuppression resulted in treatment delays and dose reductions (24% and 21% of cycles, respectively). Response (complete response, very good partial response, or partial response) was observed in five patients (RR = 20% +/- 8%) with a median duration of 6 months and an objective or mixed response in five additional patients. CONCLUSION: Temozolomide shows activity in heavily pretreated patients with NB, and deserves further evaluation in combination with another drug.

Adolescent↗

Imaging of conjoined twins.

The incidence of conjoined twins is estimated to be around 1 in 250,000 live births. There is a distinct female predominance. In this paper the imaging of conjoined twins both antenatally and postnatally is reviewed, in particular taking into consideration recent advances with multidetector CT. Accurate counselling of parents regarding the likely outcome of the pregnancy and the likelihood of successful separation is dependent on good prenatal imaging with ultrasound and MRI. Planning of postnatal surgical separation is aided by accurate preoperative imaging which, depending on the conjoined area, will encompass many imaging modalities, but often relies heavily on CT scanning.

Contrast Media↗

Limitations with the response evaluation criteria in solid tumors (RECIST) guidance in disseminated pediatric malignancy.

BACKGROUND: Response evaluation criteria in solid tumors (RECIST) guidelines were published in 2000 to evaluate response to treatment in solid tumors. These have sought to unify response assessment, and the new guidelines extend beyond lesion assessment to address modern imaging strategies. The RECIST guidelines, however, become complex and problematic when used to evaluate metastatic disease. METHODS: Ten consecutive oncology cases representative of tumors common to our pediatric practice were selected. All cases were evaluated at initial presentation and follow-up. The RECIST criteria were retrospectively applied in each case. A standardized evaluation form was used. RESULTS: The age range of the patients included in the study was 1 month to 16 years, with a mean age of 3.9 years. A range of tumor responses was identified: partial response (n = 6), stable disease (n = 2), and progressive disease (n = 2). Two of these responses were likely incorrect. Tumor bulk was underestimated in the axial plane, many lesions were either calcified and unmeasurable, or despite being well-defined were too small to be measurable under the strict RECIST guidance. CONCLUSION: In highlighting specific problems with disseminated pediatric tumors, we emphasize the pressing need for debate regarding the application of RECIST in pediatric oncology and encourage the development of a pediatric radiology oncology group to collaborate in future modifications of the RECIST guidance.

Adolescent↗

The portal vein in children: radiological review of congenital anomalies and acquired abnormalities.

A variety of portal vein anomalies that occur in children can be identified by US, CT, MRI and portal venography. Although these abnormalities can also occur in adults, there are certain pathological processes and aberrations within the portal system that are specific to children. Knowledge of the embryology and anatomy of the portal vein is of benefit in the understanding of these anomalies. Identifying deviations from normal portal architecture is important in the work-up for surgery such as liver transplantation, and prior to interventional procedures such as stent placement or embolization. The aim of this paper is to summarize the various types of congenital and acquired portal vein abnormalities that occur in children, describe their radiological features and provide images to demonstrate the differences from normal portal venous anatomy.

Child↗

Gastroenteric fistula complicating percutaneous endoscopic gastrostomy.

BACKGROUND: Gastroenteric fistula occurs in 2% to 3% of patients undergoing percutaneous endoscopic gastrostomy (PEG). The authors identified 12 children with this major complication. METHODS: A retrospective case note review was performed. RESULTS: Over a 5-year period, the complication rate for gastroenteric fistula was 3.5% (12 of 343 procedures). Presentation ranged from 1 day to 25 months post-PEG insertion. Eight patients presented with acute intestinal obstruction. The gastroenteric fistulous tract involved the posterior wall of the stomach in all cases. The plain abdominal x-ray was useful in establishing the diagnosis of the gastroenteric fistula. CONCLUSIONS: Patients with gastroenteric fistula as a complication of PEG insertion can remain asymptomatic for prolonged periods. It often is difficult to make the diagnosis. A plain abdominal x-ray is a useful diagnostic modality.

Cerebral Palsy↗

Paediatric non-neuronopathic Gaucher disease: recommendations for treatment and monitoring.

UNLABELLED: In individuals with non-neuronopathic Gaucher disease, childhood manifestations are usually predictive of a more severe phenotype. Although children with Gaucher disease are at risk of irreversible disease complications, early intervention with an optimal dose of enzyme therapy can prevent the development of complications and ensure adequate, potentially normal, development through childhood and adolescence. Very few, if any, children diagnosed by signs and symptoms should go untreated. Evidence suggests that disease severity, disease progression and treatment response in different organs where glucocerebroside accumulates are often non-uniform in affected individuals. Therefore, serial monitoring of the affected compartments is important. This should include a thorough physical examination at 6- to 12-monthly intervals. Neurological assessment should be performed to rule out neurological involvement and should be undertaken periodically thereafter in children who are considered to have risk factors for developing neuronopathic disease. Haematological and biochemical markers, such as haemoglobin, platelet counts and chitotriosidase levels, should be assessed every 3 months initially, but when clinical goals have been met through treatment with enzyme therapy, the frequency can be reduced to every 12 to 24 months. Careful monitoring of bone disease is vitally important, as the resulting sequelae are associated with the greatest level of morbidity. By combining various imaging modalities, the skeletal complications of non-neuronopathic Gaucher disease can be effectively monitored so that irreversible skeletal pathology is avoided and pain due to bone involvement is diminished or eliminated. Monitoring must include regular psychosocial, functional status and quality-of-life evaluation, as well as consistent assessment of therapeutic goal attainment and necessary dosage adjustments based on the patient's progress. CONCLUSION: Through comprehensive and serial monitoring, ultimately, a therapeutic dose of enzyme therapy that achieves sustained benefits can be found for each child with non-neuronpathic Gaucher disease.

Bone Density↗

Non-Hodgkin's lymphoma presenting with uterine and renal enlargement in a young girl.

Non-Hodgkin's lymphoma (NHL) is the fourth most common childhood malignancy. Uterine involvement with NHL is well described in adults, rare in children and has not been described in the first 2 years of life. While renal involvement in NHL is well recognised, diffuse renal enlargement is an uncommon finding. We report a unique case of B-cell lymphoma of primitive phenotype in a 15-month-old girl with uterine and renal involvement at presentation. We describe the US and MRI features at presentation that helped in the prospective diagnosis of this condition.

Female↗

Routine magnetic resonance imaging of the spine in children with Gaucher disease: does it help therapeutic management?

BACKGROUND: Routine magnetic resonance imaging (MRI) surveillance of bone marrow change in patients with Gaucher disease (GD) is recommended, but interpretation of imaging findings in the developing skeleton may be difficult. OBJECTIVES: To assess the agreement between routine spinal MRI findings and clinical course in paediatric GD patients receiving enzyme replacement therapy (ERT). MATERIALS AND METHODS: A retrospective institutional review of all GD patients on ERT who had had repeated routine spinal MRI in accordance with national recommendations ( n=14) was carried out. Vertebral body bone marrow MRI T1 signal was assessed relative to intervertebral discs. MRI findings were then compared with recorded date(s) of ERT initiation and possible therapy changes. RESULTS: Nine patients had spinal MRI both before and after the start of ERT. MRI T1 marrow signal was normal in two and abnormal in three of the nine patients both before and after the start of ERT. Two of the nine patients had normalization and one had conversion from normal to abnormal T1 signal. Interpretation was uncertain in one. Seven episodes of treatment intensification occurred. MRI T1 marrow signal was normal before five and uncertain before two of the seven episodes. CONCLUSION: Routine spinal MRI had low accuracy for predicting clinically indicated therapy intensification.

Bone Marrow↗

MRI features of bilateral parotid haemangiomas of infancy.

The aim of this article is to report the MRI features of bilateral parotid haemangiomas of infancy and highlight the diagnostic and prognostic value of MRI especially with regard to those lesions that may cause respiratory compromise. Retrospective review of MRI scans in six infants with bilateral parotid haemangiomas. The bilateral haemangiomas were symmetrical in all but one patient. On T1-weighted images the masses were isointense to muscle and on T2 they were hyperintense with numerous small vessels giving a septated appearance. There was vivid enhancement with gadolinium in all cases. In three patients, deep bilateral extensions were demonstrated involving the parapharyngeal spaces resulting in respiratory compromise which required tracheostomy. Bilateral parotid haemangiomas are rare, but when present may have deep extensions, which can result in respiratory compromise requiring tracheostomy.

Female↗

Mesenteric mass in a young girl--an unusual site for Gaucher's disease.

We report the first case of a child with Gaucher's disease and a large mesenteric mass, confirmed histologically to be Gaucher's cell infiltrates. We describe the radiological findings and discuss further management. The advent of enzyme replacement therapy has prolonged survival and the emergence of previously undocumented manifestations of the disease is being observed. The radiologist and clinician should be alert to the possible development of these new problems and the fact that in Gaucher's disease a palpable right upper-quadrant mass need not necessarily represent hepatomegaly.

Diagnosis, Differential↗