Tumor-induced osteomalacia.

Tumor-induced osteomalacia, also known as oncogenic osteomalacia, is a rare paraneoplastic syndrome in which vitamin D resistant osteomalacia occurs due to the presence of a tumor. The following case report describes a young woman who seeks a second opinion from a rheumatologist and is found to have oncogenic osteomalacia. Not often discussed in the rheumatology literature, oncogenic osteomalacia is a rare and interesting disease entity in which diagnosis is often more challenging than treatment.