[Large ossifying fibroma of the jaws and hyperparathyroidism in a chronic hemodialyzed patient]. / Fibrome ossifiant géant des maxillaires et hyperparathyroïdisme chez un hémodialysé chronique.

OBJECTIVE: Describe the exceptional and fortuitous character of the association of ossifying fibroma and hyperparathyroidism in a chronic hemodialyzed patient. CASE REPORT: A twenty-year-old man who had undergone dialysis for ten years as the result of an indeterminate nephropathy was admitted for a functional disability in the standing position and a serious dysmorphic syndrome with swelling of the jaws that hindered proper closure of the mouth. RESULTS: Medical imagery revealed a polyostotic attack pleading in favor of renal osteodystrophy or a fibrous dysplasia. The surgical reduction of the tumor of the jaws shown, from the histological viewpoint, a large aggressive ossifying fibroma of the jaws. CONCLUSION: The association of ossifying fibroma and hyperparathyroidism in a chronic hemodialyzed patient is exceptional and fortuitous. The difficult treatment points out the need for early rigorous prevention of hyperparathyroidism in a chronic hemodialyzed patient.

[Fibrocartilaginous mesenchymoma of bone. A case report]. / Mésenchymome fibrocartilagineux intraosseux. A propos d'un cas.

Fibrocartilaginous mesenchymoma of bone is a tumoral entity which is somewhat controversial. It has been delineated in 1984 by Dahlin and al. Fifteen cases have been reported in the literature. We report a new case which involves proximal humerus. X-ray data, microscopic findings and local recurrence indicate a low grade malignancy. Metastasis have never been reported. The main differential diagnosis are desmoplastic fibroma, fibrous dysplasia and fibrosarcoma with low grade malignancy. Treatment is surgical.

[Renal oncocytoma. Apropos of a new case. Diagnostic and therapeutic problems]. / Oncocytome rénal. A propos d'un nouveau cas. Problème diagnostic et thérapeutique.

The authors report a case of renal oncocytoma. Ultrasonographic and C.T. imaging has considerably simplified a preoperative diagnosis of this rare renal tumor; true diagnosis was only confirmed by histological examination. Surgical treatment counted in radical nephrectomy.

[Xanthogranulomatous pyelonephritis. Apropos of 11 cases]. / Les pyélonéphrites xanthogranulomateuses. A propos de 11 cas.

Xanthogranulomatous pyelonephritis is a rare manifestation of chronic pyelonephritis. 11 cases were treated between 1988 and 1993. Patients age ranged from 17 to 60 years (mean 34 j). A pseudotumoral form was documented in 3 patients and pyonephrosis was found in 8 cases. Urine culture was usually positive for a non specific germ. Imaging technics could differentiate pseudotumoral disease from diffuse disease. Treatment consisted in a nephrectomy.

[An extremely rare retro-vesico-prostatic tumor: peritoneal cystic mesothelioma]. / Une étiologie rarissime de tumeur rétro-vésico-prostatique: le mésothéliome kystique du péritoine.

The authors report an uncommon case of sub-peritoneal tumor. This tumor, which took the econographic features of multivesicular hydatic cyst, was in fact a mesothelia of the peritoneum. It was located behind the bladder and the prostate. The authors think that this localisation is an argument in favor of the peritoneal origin of Denonvilliers's prostatoperitoneal fascia.

[Bone resorption and remodelling in chondrosarcomas of the limbs and pelvis. Diagnostic value in 84 cases]. / Résorption et remodelage osseux dans les chondrosarcomes des membres et des ceintures. Valeur diagnostique à propos de 84 cas.

Aside well known histological and cytological arguments of malignancy, we have analysed the tumoral growth and invasion in periphery for the skeletal chondrosarcoma diagnosis. This study involves 84 cases of chondrosarcoma of limbs, and pelvic limb selected from 176 cases of chondrosarcoma seen in the Cochin hospital. The following constatations were made: the tumor growth is fast in a chondrosarcoma and the lesions are continuous; in a same case, we can assist to tumoral invasion signs and bone reparation signs. In the reverse, this growth is slow in an enchondroma and the lesions are the more often stabilized by a mature peri-tumoral osteogenesis. The residual bone fragments into the tumor are constant in the chondrosarcoma and more rare in the enchondroma. The peri-tumoral osteogenesis, identical to enchondral bone formation, is the more often immature in chondrosarcoma and always mature in enchondroma. The active bone resorption as well as the actual bone remodelling, are more frequent in the chondrosarcoma borders than the enchondroma those. Lastly, the peri-tumoral fibrosis is the own of enchondroma; its existence in the chondrosarcoma is only the reflection of a residual enchondroma.