Giant hydatid lung cysts represent a distinct pathology. They affect essentially adolescents and may reach a large size causing parenchymal destruction. Thus, surgical resections are frequently used and postoperative complications rate is high.

The hydatid cyst is a frequent pathology in Morocco. All localizations are possible. However, renal hydatid cyst is still rare; it constitutes about 2.5 % of all localizations. We report 4 cases admitted at the Department of Pediatric Surgery of the University Hospital of Fes in the period running from February 2004 to January 2008. The four patients were of ages ranging from 8 to 11 years old. Two of them had double localization in the kidney and liver. The imaging was the diagnostic tool of choice. The patients benefited from surgical treatment; two were treated using standard surgery while laparoscopic surgery was used in the next two. Anti-parasitic medication was associated in the post-surgery stage for a period of six months. The evolution was good for all the patients.

Shah-Waardenburg syndrome (SWS) is a neurocristopathy and is characterized by Hirschsprung's disease (HD), deafness, and depigmentation of hairs, skin, and iris. Is a very rare congenital disorder with variable clinical expression. This report describes a 4-day-old male newborn with Waardenburg's syndrome associated with aganglionosis of the colon and terminal ileum, and review the relevant literature for draws attention to the causal relationship between these two entities.

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Giant-cell tumor is a rare benign tumor that generally arises in long bones of the lower extremity in adults. The involvement of the metacarpal bone in children is extremely rare. The authors report the case of an 8-year-old boy admitted for a painless swelling of the posterior surface of the fourth right metacarpal bone. The radiological examination showed an expansile osteolytic lesion with a multilocular appearance. Total resection of the metacarpal bone and reconstruction with free fibular graft was performed. We highlight the rarity of this neoplasm in childhood and discuss epidemiological, clinical, radiological, and therapeutical characteristics of this pathology.