Perioperative concerns in patients with tumor-induced osteomalacia for surgical excision of tumor.

Tumor-induced osteomalacia (TIO) or oncogenic osteomalacia is a paraneoplastic syndrome, usually associated with mesenchymal tumors. TIO is probably an underreported entity owing to diagnostic and localizing limitations. With improvement in such modalities, patients with TIO are likely to be encountered more frequently in future anesthetic practice. It does not respond to conservative medical management; thus surgical resection of the lesion is the treatment of choice. Anesthetic management of such cases has not been reported in published studies and thus we report two such cases of hypophosphatemia, induced by frontoethmoidal tumors and the anesthetic implications and challenges of such a rare entity. Surgical excision of the causative lesion results in dramatic resolution of symptoms. Vigilant adherence to the pertinent perioperative concerns related to severe hypophosphatemia is crucial to a favorable surgical outcome in these patients.