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[Tumoral hypocalcemia].

J A Riancho, R Arjona, S Echevarría

    Revista Clinica Espanola
    |March 1, 1989
    PubMed
    Summary
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    Hypocalcemia, a rare paraneoplastic manifestation, can result from extensive osteoblastic metastasis. This case highlights how massive calcium shifts to metastatic bone can overwhelm the parathyroid hormone-vitamin D axis.

    Area of Science:

    • Endocrinology
    • Oncology
    • Nephrology

    Background:

    • Hypocalcemia is an uncommon paraneoplastic syndrome.
    • The underlying mechanisms of hypocalcemia in cancer patients are not fully understood.

    Observation:

    • A patient presented with hypocalcemia (corrected serum calcium 7.2 mg/dl) and low calciuria (<10 mg/24 h).
    • Laboratory results revealed normal magnesium, phosphate, and 25-hydroxyvitamin D levels.
    • Elevated parathyroid hormone (PTH) and 1,25-dihydroxyvitamin D levels were noted.

    Findings:

    • The patient had extensive osteoblastic bone metastasis.
    • The hypocalcemia was attributed to a massive calcium shift into the metastatic bone.
    • This calcium shift exceeded the compensatory capacity of the PTH-vitamin D axis.

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    Implications:

    • This case suggests a novel mechanism for paraneoplastic hypocalcemia.
    • Understanding calcium dynamics in bone metastasis is crucial for managing cancer-related metabolic disturbances.
    • Further research into the PTH-vitamin D axis's role in cancer-induced hypocalcemia is warranted.