The treatment of head and neck cancer with radiotherapy and radical neck dissection has many recognized complications. Radiotherapy in therapeutic doses can produce devascularization and weakening of bone. Radical neck dissection results in altered mechanics of the shoulder girdle and a disruption of normally balanced forces acting on the clavicle. An unusual case of clavicle fracture which is considered to have resulted from an interaction of the effects of these therapies is discussed. An approach for recognizing and distinguishing this entity by its time course, and radiographic and nuclide bone scan appearance is presented.
Summary. The tongue-like accessory lobe of the liver (Riedel's lobe) that is related to the inferior portion of the right hepatic lobe is a common finding on nuclear medicine imaging of the liver and has been observed principally in females. In a sampling of liver images in 564 consecutive patients that included 319 females and 245 males, the authors found the evidence of Riedel's lobe to be 19.4% in females and 6.1% in males. It is surprising that there is little or no mention of this accessory lobe in some of the leading textbooks of anatomy. It may be that the possible frequent incidence of Riedel's lobe of the liver as an anatomical variant has not been emphasized in the past because gross anatomic information may not have been collected from a sufficient number of females.
Etude seintigraphique du lobe de RiedelR6sum~. Le lobe accessoire du foie (lobe de Riedel) qui est rattach6 ~i la portion inf6rieure du foie droit est souvent observ6 sur des scintigraphies h6pa-tiques, plus fr6quemment chez la femme. Sur une s6rie de 564 scintigraphies cons6cutives partiqu6es chez 319 femmes et 245 hommes, les auteurs ont trouv6 un lobe de Riedel chez 19,4% des femmes et 6,1% des hommes. I1 est 6tonnant de constater que ce lobe est peu, voire m6me pas mentionn6 du tout darts la plupart des meilleurs livres d'anatomie. I1 est possible que la fr6quence relative du lobe de Riedel ait 6t6 sous-estim6e en anatomie macroscopique en raison du faible nombre de sujets 6tudi6s, notamment du sexe f6minin.
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