Rheumatology 2000; 39: 1415-1421
© 2000 British Society for Rheumatology
Grand Rounds in Rheumatology |
Four cases of acquired hypophosphataemic (oncogenic) osteomalacia. Problems of diagnosis, treatment and long-term management
Division of Bone and Mineral Metabolism, Royal National Orthopaedic Hospital, Brockley Hill, Stanmore, Middlesex HA7 4LP, UK
KEY WORDS: Acquired hypophosphataemic osteomalacia, Oncogenic hypophosphataemic osteomalacia (OHO).
| The first 150 words of the full text of this article appear below. |
The insidious development of progressive bone pains and muscle weakness are well-known features of osteomalacia which may have many causes [1]. Particular diagnostic difficulties are encountered in acquired hypophosphataemia, a condition associated with increased renal phosphate clearance [2] and low circulating 1,25dihydroxyvitamin D [1,25(OH)2D, calcitriol] [3, 4]. Many patients with this disease are shown to have benign tumours of mesenchymal origin with prominent fibrous and vascular characteristics [3, 4]. Cure is generally expected to follow surgical resection, with return of phosphate and 1,25(OH)2D levels to normal [35], indicating a likely causal relationship between tumour and both hypophosphataemia and 1,25(OH)2D production. Furthermore, experimental evidence supports a role for tumour products which influence both renal tubular cell phosphate transport and 1
-hydroxylase activity [69]. The term oncogenic hypophosphataemic osteomalacia (OHO) is
Case reports
Patient 1
Patient 2
Patient 3
Patient 4
Discussion
Delay in diagnosis of OHO and the search for tumours
Management of acquired hypophosphataemic osteomalacia and OHO
Relapse of osteomalacia
Long-term pharmacological management
Tumours in OHO
Concluding remarks
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