title: [Bone metastases in the maxilla as first manifestation of renal cell cancer. A case report].
abstract: BACKGROUND
  Bone metastases in the upper jaw are relatively rare but not unusual in oral and maxillofacial surgery. In many cases finding the primary tumour is difficult because of its occult location.
  
  
  METHODS
  We describe a 53-year-old female patient who suffered from a tumor in the oral cavity. The first histological and clinical diagnosis revealed a granuloma pyogenicum. Because of the delayed healing process another biopsy became necessary showing a metastasis of an unknown primary tumor. Diagnostic procedures detected an adenocarcinoma of the left kidney with pelvic metastases. Appropriate surgical intervention and chemotherapy were subsequently initiated.
  
  
  CONCLUSIONS
  The present case report demonstrates how difficult it can be to provide the right pathological diagnosis in biopsy material even regarding obvious malignancy. Therefore thorough diagnostic efforts are indispensable to facilitate the causal treatment of an unknown primary tumor.
authors.affiliation: Universitätsklinik und Poliklinik für Mund-, Kiefer- und Plastische Gesichtschirurgie, Martin-Luther-Universität Halle-Wittenberg, Halle/Saale, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Heinroth
authors.forename: U
authors.initials: U
authors.lastname: Bilkenroth
authors.forename: A W
authors.initials: AW
authors.lastname: Eckert
authors.forename: P
authors.initials: P
authors.lastname: Maurer
mesh_terms: D044963:Biopsy, Fine-Needle; D001859:Bone Neoplasms / Q000175:diagnosis / Q000473:pathology / Q000556:secondary / Q000628:therapy; D002292:Carcinoma, Renal Cell / Q000175:diagnosis / Q000473:pathology / Q000556:secondary* / Q000628:therapy; D003131:Combined Modality Therapy; D003937:Diagnosis, Differential; D018450:Disease Progression; D005260:Female; D006801:Humans; D007668:Kidney / Q000473:pathology; D007680:Kidney Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000628:therapy; D008437:Maxilla / Q000473:pathology; D008441:Maxillary Neoplasms / Q000175:diagnosis / Q000473:pathology / Q000556:secondary* / Q000628:therapy; D008875:Middle Aged; D010386:Pelvic Neoplasms / Q000175:diagnosis / Q000473:pathology / Q000556:secondary / Q000628:therapy