Osteomalacia caused by tumors in facies cranii mimicking rheumatoid arthritis

Tumor-induced osteomalacia (TIO) is an extremely rare metabolic bone disease and the occult offending tumor arising in facies cranii is even more uncommon. In this report, we described 2 middle-aged females with TIO caused by the tumor in facies cranii, which had ever been misdiagnosed as rheumatoid...

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Bibliographic Details
Published in:Rheumatology international 2012-08, Vol.32 (8), p.2573-2576
Main Authors: Xian-Ling, Wang, Jian-Ming, Ba, Wen-wen, Zhong, Zhao-Hui, Lü, Jing-Tao, Dou, Ju-Ming, Lu, Yi-Ming, Mu
Format: Article
Language:English
Subjects:
Adult
Arthritis, Rheumatoid - diagnosis
Diagnostic Errors
Female
Head and Neck Neoplasms - complications
Head and Neck Neoplasms - diagnosis
Head and Neck Neoplasms - surgery
Humans
Hypophosphatemia - diagnosis
Hypophosphatemia - etiology
Magnetic Resonance Imaging
Medicine
Medicine & Public Health
Neoplasms, Connective Tissue - complications
Neoplasms, Connective Tissue - diagnosis
Neoplasms, Connective Tissue - surgery
Osteomalacia - diagnosis
Osteomalacia - etiology
Predictive Value of Tests
Rheumatology
Short Communication
Tomography, X-Ray Computed
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Summary:Tumor-induced osteomalacia (TIO) is an extremely rare metabolic bone disease and the occult offending tumor arising in facies cranii is even more uncommon. In this report, we described 2 middle-aged females with TIO caused by the tumor in facies cranii, which had ever been misdiagnosed as rheumatoid arthritis. Case 1 was present with diffuse bone pain and muscle weakness for 4 years, as well as esotropia in the right eye for 1 month. Case 2 was present with progressive bone pain in low back and hip for 2 years. Biochemical studies both showed persistent hypophosphatemia and urinary over wasting phosphate. Radiological examinations revealed the infiltrative mass in right apex partis petrosae ossis temporalis in case 1, and the soft mass in left nasal cavity and ethmoid sinuses in case 2, respectively. The offending tumors were resected completely in case 2, however, incompletely in case 1. Pathology examination revealed mixed connective tissue variant phosphaturic mesenchymal tumors. In conclusion, TIO should be presumed in patients presenting with unexplained persistent hypophosphatemia osteomalacia, also a thorough detection for tumor in facies cranii should be performed.
ISSN:0172-8172
1437-160X
DOI:10.1007/s00296-011-2018-4