Earth Observation (EO) data is seen as a major source of information to characterise the Earth's surface, but is conventionally analysed using pixel-based approaches that do not incorporate the concept of landscape features or realworld objects. The UK land cover maps to date have been developed in an attempt to exploit landscape features to improve the quality and accuracy of their derived products. For Land Cover Map 2007 (LCM2007) landscape features will be derived from a generalised version of OS MasterMap to capture the required real-world objects. This paper describes the generalisation process that aligns the scale of the landscape features with the information content of high spatial resolution EO data as the first step in the production of LCM2007.

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Calcium pyrophosphate dihydrate (CPPD) deposition disease is an inflammatory arthropathy characterized by the deposition of weakly positively birefringent crystals in articular and periarticular structures. It has also been referred to as pseudogout (owing to its clinical similarity to gout) and articular chondrocalcinosis. T h e CPPD crystals are deposited exclusively in joints and bursae, with occasional extension beyond the anatomical confines of the joint. The cervical spine is uncommonly affected, and symptomatic cervical spine involvement is rarer still. There have been only 12 reported cases of symptomatic CPPD deposition disease involving the C1-2 articulation. 1 -6 We describe a case of an elderly woman who developed a progressive cervical myelopathy from C1-2 instability associated with CPPD deposition disease involving the transverse atlantal ligament. ABSTRACT:Background: Calcium pyrophosphate dihydrate deposition in the cervical spine is infrequently symptomatic. This is especially true at the craniocervical junction and upper cervical spine. Case Report: A 7 0 -y e a r-old previously healthy woman presented with a progressive cervical myelopathy of four months duration. Results: Examination revealed sensorimotor findings consistent with an upper cervical myelopathy. Radiological studies (plain radiographs, computed tomography, and magnetic resonance imaging) revealed C1-2 instability, and a well-defined extradural 3cm x 1cm retroodontoid mass causing spinal cord compression. Transoral resection of the mass was performed followed by posterior C1-2 stabilization. Histological examination of the mass confirmed calcium pyrophosphate dihydrate deposition. Follow-up examination showed marked clinical and radiological improvement. Conclusion: Although uncommon, calcium pyrophosphate dihydrate deposition disease should be considered in the differential diagnosis of extradural mass lesions in the region of the odontoid.RÉSUMÉ: Pseudo-goutte du ligament transverse de l'atlas: une cause rare de myélopathie cervicale. Introduction: Il est rare que des dépôts de pyrophosphate dihydrate de calcium provoquent des symptômes, particulièrement quand ils sont situés à la jonction crânio-cervicale et à la région supérieure du rachis cervical. Observation: Une femme de 70 ans, sans antécédents médicaux, a consulté pour une myélopathie cervicale évoluant depuis 4 mois. Résultats: L'examen physique a montré des anomalies sensitivo-motrices compatibles avec une myélopathie cervicale haute. L'imagerie (radiographie simple, tomodensitométrie et résonance magnétique) ont montré une instabilité C1-C2 et une masse épidurale, rétro-odontoïde, bien définie de 3cm par 1cm comprimant la moelle épinière. La patiente a subi une résection transorale de la masse avec stabilisation postérieure C1-C2. L'examen histologique de la masse a confirmé qu'il s'agissait d'un dépôt de pyrophosphate dihydrate de calcium. L'état clinique de la patiente, ainsi que l'imagerie, se sont améliorés de façon importante. Conclusion: Bien que rare, le dé...

This new technique of anterior fixation of the atlas to the occiput is feasible and safe if meticulous surgical planning is performed.