Urachal neuroblastoma: first case report.

Tumours of the urachus are exceptional in children. They represent 0.01% of all tumours and consist of mucosecretory adenocarcinoma and, more rarely, transitional cell carcinoma.

[Osteosarcoma of the mandible].

We describe a case of osteosarcoma of the mandible presenting as a soft tissue mass associated with an enlargement of the mandibular canal at imaging work-up. Radiographic, isotopic, CT and MR features are reported.