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Mesenchymal chondrosarcoma (MC) is an infrequent, highly malignant neoplasm of the soft tissues and bone. It is very rare in the pediatric age group, especially in the intraspinal location. Only 24 cases have been reported to date. The authors present a case of a 14-year-old boy with an intraspinal MC who died of the disease 50 months from the initial diagnosis and after the third local recurrence. The patient was treated with a combination of chemotherapy, radiotherapy, and surgery. The authors review the clinical presentation, diagnostics, and the efficacy of treatment of pediatric patients with MC reported in the literature from 1978 to 2010.

The rarity of malignant and intermediate vascular tumors in children means that little is known about their clinical course, optimal treatment, and variables predicting survival. A total of 32 children with malignant vascular tumors (14 angiosarcomas [AS], 5 epithelioid hemangioendotheliomas, and 13 intermediate vascular tumors, including other hemangioendotheliomas plus adult-type hemangiopericytomas), registered in the German and Polish Paediatric Soft Tissue Sarcomas Study Groups, were treated following the Cooperative Weichteilsarkom Studiengruppe (CWS)-81, -86, -91, and -96 protocols. Male sex, AS histology, tumor size >5 cm, and T2 invasiveness were independent predictors of inferior 5-year overall survival, while AS histology and T2 invasiveness were predictors of inferior 5-year event-free survival. AS histology was the most important negative prognostic factor for overall survival and event-free survival. Completeness of primary tumor excision was a good prognostic factor for survival in univariate, but not multivariate, analysis. Local therapy (radiotherapy and delayed surgery) were provided to the minority of patients (28% and 38%, respectively) late in the course of disease (after a mean of 9 and 6 months, respectively) and did not prevent local relapses. Response to systemic treatment was poor (44%) and did not prevent local and distant relapses. The clinical course and outcome in childhood epithelioid HE seems to be similar to intravascular tumors and less aggressive than AS. RTX and delayed surgery should be performed more frequently and earlier in the disease course. An urgent need for modification of systemic therapy is needed because of the development of many metastatic and/or combined relapses and poor response to classic chemotherapy. The problem of effective therapy for childhood AS is the most appaling: 13 of 14 patients died of progression despite multimodal treatment.

Mesenteric cysts are rare and mostly benign abdominal tumours in children. Majority of them are lymphangiomas (lymphatic malformations). We diagnosed a broad, multiloculated mesenteric and retroperitoneal cyst, associated with intensive inflammation, in a 4-year-old girl. Surgical therapy was fully successful.

Forty-seven children treated in various Polish centers between 1985 and 1995 for primary malignant liver tumors were retrospectively analyzed. Hepatoblastoma (HB) prevailed--it was found in 39 cases. There were 6 hepatocarcinoma (HCC) cases and 2 cases of undifferentiated sarcoma (UDS). In 44% of HB patients the tumor involved both liver lobes. 18% of children with HB presented with pulmonary metastases at diagnosis. Chemotherapy was applied in 92% of cases (preoperatively in 67%). Tumor resection was performed in 56% of HB patients. Overall survival of patients with hepatoblastoma was 43.6%, while it was 50% for hepatocarcinoma and 100% for undifferentiated sarcoma (2 cases only). Mean observation time was 58 months. The hepatoblastoma subgroup, being the largest (83% of all cases), was analyzed separately for prognostic factors. Completeness of tumor excision strongly influenced survival. Involvement of both lobes of the liver and multifocality of the tumor were other adverse prognostic factors.

Opsoclonus-myoclonus syndrome, also named Myoclonic Encephalopathy of Infants, Opsoclonus- Myoclonus Ataxia, Dancing Eyes - Dancing Feet Syndrome, Dancing Eyes Syndrome, Kinsbourne syndrome, is a rare, paraneoplastic or possibly post-viral chronic neurological disorder. The age of presentation ranges from 6 months to 3 years. In 50% of affected children the syndrome is associated with an underlying occult or clinically apparent neuroblastoma. In most patients the tumour is localized, small and well differentiated, with no NMYC gene copy number amplification. The syndrome may also occur after tumour resection or at relapse. The opsoclonus-myoclonus syndrome can occur in children without neuroblastoma, in such idiopathiccases, the onset of neurological symptoms is related to infection. It is assumed, that in idiopathic cases the syndrome could have developed in the course of neuroblastoma which had undergone a complete spontaneous regression. The most characteristic clinical features of opsoclonus-myoclonus syndrome are: opsoclonus, myoclonus, ataxia, irritability, mutism and sleep disturbances. The disease course is usually long-term with episodes of remission and relapses. Approximately 80% of children with opsoclonus-myoclonus syndrome suffer from mild to severe neurological handicaps, mainly cognitive impairment. The authors present a 2-year old boy with opsoclonus-myoclonus syndrome preceded by involution of prenatally documented retroperitoneal area tumour.

Background: Pediatric hemangiopericytoma (HPC) is an extremely rare vascular tumor with little data available on its clinical course and management. Methods: Fourteen children with HPC registered in Polish Pediatric Rare Tumors and Polish Pediatric Soft-tissue Sarcomas Studies between 1992 and 2002 are reported. Results: Seven patients (F/M: 5/2, age 2–10 months) had infantile HPC, four of whom had primary tumors affecting superficial tissues of the trunk and upper limbs. No child had initial nodal or organ metastases. Primary excision (PE) was performed only in three patients with superficial lesions. They received no supplemental treatment. The remaining four children responded well to chemotherapy (CHT), entering complete remission after CHT alone (n= 2) or after delayed resection (n= 2). No relapses occurred and all patients were alive 48–146 months after treatment. Seven patients (F/M: 2/5, age 3.2–16.5 years) had adult-type HPC, five of whom had tumors localized in superficial tissues of the lower limbs or head/neck. All patients presented with locally advanced disease. PE was performed in five children (complete in four); all patients were alive at follow up of 40–127 months. Three patients died of recurrence after incomplete PE despite supplemental chemo- and radiotherapy. Conclusions: Complete surgical excision remains the mainstay of treatment for both HPC types. In unresectable adult-type HPC adjuvant chemo- and radiotherapy should be administered in macro- and microscopic tumor residues, but the prognosis is poor despite supplemental treatment. High chemo-responsiveness of infantile-type HPC produces a favorable outcome even in cases of unresectable, life-threatening tumors.

Thymomas and thymic carcinomas are rare neoplasms derived from the epithelial tissue of thymus, very infrequently developing in young adults and children. The estimation of thymomas' invasiveness has been the matter of discussion for many years reflected by numerous clinical and histological classifications. In 1999 the WHO classification was created, joining all the most important issues present in previously used systems. It is believed that histological structure is the most important prognostic factor in thymic carcinomas while in less aggressive types of thymomas the clinical stages influence the outcome. Staging of thymomas is most commonly based on the Masoka classification. Independent evaluation of the stage and histological aggressiveness are necessary to predict the clinical course and outcome in thymomas. Thus the term 'malignant thymoma' has been replaced by 'invasive thymoma' in clinical practice. The treatment strategy depends on the clinical stages of thymoma. Complete resection of the tumour is the treatment of choice with supplementing radiotherapy in more advanced clinical stages. Chemotherapy in invasive thymomas has been reported to play an increasingly important role as induction, supplementing and palliative therapy. It has been proved that combined treatment improves the outcome in invasive thymomas, especially in thymic carcinomas. This paper reviews the literature data concerning the histology, clinical issues and treatment of thymomas and thymic carcinomas. The clinical data on nine children with thymic carcinomas treated between 1992 and 2006 in the Polish oncological and surgical centres were also analysed and presented. Based on multicentre data we were able to conclude the following: 1. Thymic carcinomas in children are very rare and that is why early diagnosis is often difficult. 2. At diagnosis most cases are already inoperable, which results in poorer prognosis. 3. Complex adjuvant chemo- and radiotherapy in childhood thymic carcinomas seem to prolong overall survival. 4. Further detailed analysis in all the cases of thymic carcinomas in children is recommended in order to estimate the optimal strategy of treatment.

To assess selected angiogenic markers; microvascular density and the expression of VEGF and Flk-1 in relation to clinical features and morphologic types of neuroblastoma.Eighty-two children with neuroblastoma were studied. Morphological assessment was performed in paraffin embedded tissues of the primary tumours. Microvessels within tumour tissue were counted on immunohistochemically stained sections using anti CD34 antibody. The expression of VEGF and Flk-1 was estimated semiquantitively in immunohistochemically stained sections with adequate antibodies. The results of angiogenic studies were referred to the clinical data: age, clinical stage, localization and site of the primary tumour, serum LDH and ferritin at diagnosis. The correlation between angiogenic markers and morphological type of neuroblastoma was also evaluated.Microvascular density varies in a wide range (32-325/mm(2)). There was no significant statistical difference between previously untreated and tumours assessed after chemotherapy. Analyzing the correlations between the angiogenic markers and clinical features we found a converse relation between the age and microvascular density. The highest expression of VEGF was found in adrenal tumours in comparison to other localizations. Undifferentiated and poorly differentiated tumours presented a higher expression of VEGF and higher vascular density. Non significant higher expression of VEGF and higher vascular density was noticed in smaller5 cm tumours.Correlations were found between the microvascular density and the age, diameter and the localisation of the primary tumour. Expression of VEGF depends on the localisation of the tumour. Neuroblastoma tumours arising in small children and poorly differentiated types of neuroblastoma indicate higher angiogenic activity.

Malignant vascular tumours represent a rare group of neoplasms, usually treated according to protocols for soft tissue sarcomas.To assess the clinical characteristics, disease course and outcome in Polish children with malignant vascular neoplasms.The Polish Paediatric Rare Tumours Study retrospectively analysed multicentre data on 32 children with vascular tumours, registered between 1992 and 2002. On the basis of the histological type of the neoplasm these patients have been divided into three groups: group I -- 10 patients with angiosarcoma (ASA), group II -- 7 children with haemangioendothelioma (HE) and group III- 15 patients with haemangiopericytoma (HP), of both infantile (7 children) and adult-types (8 patients).Group I: 5 patients presented with local, 3 with systemic and 2 with regional disease. Primary complete resection (PRC) was performed in 7 patients, not resulting in local control in any of them. Radiotherapy (RTX) was administered in 5 patients, chemotherapy (CHT) in all. 7 patients relapsed, 3 never entered clinical remission. 9 of the 10 patients of group I, died of disease progression. Group II: PRC was performed in 5 patients and led to local control in 2. Adjuvant RTX was used in 2 and CHT in 4 patients. 2 children relapsed and died of the disease. Infantile HP: PRC was performed in 3 children, remaining 4 patients received adjuvant CHT All children entered complete remission and are disease-free. Adult-type HP: PRC was performed in 5 patients, resulting in local control in 4. Five children were given adjuvant RTX and six CHT Three patients relapsed and died of disease progression.The effectiveness of primary complete resection in all groups was doubtful. The high rate of metastatic relapses suggests that the currently given systemic therapy is not satisfactory. The only tumour with excellent prognosis was infantile type HP (all patients are alive and free of disease). Adequate treatment for children with angiosarcoma remains still unknown -- 9 of 10 patients died of disease progression. Prognosis in patients with haemangioendothelioma is intermediate, however the role of immunotherapy should be further investigated.

Nephroblastoma is the most common kidney tumor in Polish children.to present clinical material and outcome of 533 children with renal tumors.500 pts with nephroblastoma and 33 of non-Wilms: CMN, RCC,CSSK, RTK and others tumors were registered, mean age 4.5 years between 1993 till 2002. Stage: CS I--148, CS II--191, CS III--114, CS IV--51, CS V--29 pts. All pts with nephroblastoma were treated according to the first national PPGGL 01-92 protocol with pre-operative chemotherapy (ACT, VCR) for CS I-III and ACT, VCR, DOX in pts of stage IV, over the age of 6 months. Pre-operative chemotherapy was done to 93.8% pts.Radical nephrectomy post pre op chemotherapy was performed in 451 (98%) pts over 6 months and in 44 (8.2%) infants less than 6 months with nephroblastoma. Partial nephrectomy for unilateral tumor post preoperative chemotherapy was made in 6 (1.2%). In 26/29 (89.65%) of CS V nephroblastoma kidney sparing surgery was possible, and in 12 uni-lateral nephrectomy was performed. Surgical complications were mild and occurred only in 8.9% pts.5-years overall survival of CS I pts (favorable and standard histology) is 93.48%, CS II--96.8%, CS III--84.4%, CS IV--67%, CS V--58%. The results of treatment of 33 pts with non-Wilms renal tumors have improved lately. 78.7% of our pts achieved 5-years overall survival.The use of systemic neoadjuvant chemotherapy in all pts over 6 months according to the recommendation of SIOP Nephroblastoma protocol (01-92) produced tumor shrinkage, facilitated complete surgical nephrectomy, and was very advantageous in the treatment of renal tumors in children. The results of treatment of non-Wilms tumor have also improved thanks to introduction of new and more aggressive regimens of chemotherapy.

We present the results of treatment of kidney tumours in newborns and infants aged less than 6 months, in the years 1993-2000, from the Nephroblastoma Committee of the Polish Paediatric Group of Solid Tumours (PPGGL). We have analysed the diagnostic and treatment results in the group of 31 children aged 0 to 6 months. For 19 children registered between 1993 and 1996, event-free survival (EFS) and overall survival (AS) were assessed. Among 450 children registered between 1993 and 2000 by PPGGL and treated for kidney tumours, there were 31 (7.1%) newborns and infants aged below 6 months. The accuracy of diagnosis based on imaging studies was 97%. Only in one child the initial diagnosis of kidney tumour was not confirmed; cystic degeneration of kidney was finally established. The tumours removed during surgery were small, with average size 213 cm3, and in half of the cases the size of the tumour did not exceed 165 cm3. Primary complete excision of the tumour was performed in 21 children (67.7%). In 10 cases histopathology confirmed mesoblastic nephroma, in 19 cases nephroblastoma and in 2 cases sarcoma clarocellulare. In 10 infants (32.2%) with nephroblastoma delayed surgery preceded by chemotherapy was performed. Indications for initial preoperative chemotherapy comprised: tumour in a single kidney, tumour in a horseshoe kidney, preoperative diagnostic biopsy of the tumour and large tumour in neonates older than 3 months. In almost 70% of the children the stage of advancement was low (stage I and IIN-). Histopathology of excised tumours confirmed in 42% of cases low risk, and in 51.6% intermediate risk. Intraoperative complications occurred in 5 infants (16%). The tolerance of reduced chemotherapy by the infants was good. AS was 100%. ESF for the 19 children registered for nephroblastoma between 1993 and 1996 for all stages of advancement and types of histology was 94.75%.1) Mesoblastic nephroma and low risk nephroblastoma are the most common tumours in children within the first three years of life. 2) The results of treatment of nephroblastoma in the youngest children (below 6 months of age) are the most favourable and represent world standards.3) Surgical complications in children operated primarily for nephroblastoma indicate the need of performing such operations in academic centres, specialised in newborn surgery. 4) In infants with extensive kidney tumours older than 3 months, primarily considered as inoperative, individual induction chemotherapy should be taken into account.