Hypercalcemia and Renal Mass: A Diagnostically Challenging Case.
hypercalcemia
paraneoplastic syndrome
pthrp
renal cancer
vitamin-d
Journal
Cureus
ISSN: 2168-8184
Titre abrégé: Cureus
Pays: United States
ID NLM: 101596737
Informations de publication
Date de publication:
Jul 2021
Jul 2021
Historique:
accepted:
29
07
2021
entrez:
13
9
2021
pubmed:
14
9
2021
medline:
14
9
2021
Statut:
epublish
Résumé
Hypercalcemia of malignancy frequently occurs in patients with solid tumors as a paraneoplastic syndrome known as humoral hypercalcemia of malignancy (HHM), caused by the secretion of parathyroid hormone-related peptide (PTHrP). On the other hand, 1,25-dihydroxyvitamin D [1,25(OH)2D]-mediated hypercalcemia is a less common cause of hypercalcemia of malignancy and is mostly observed in lymphoma patients. Here, we report an interesting case of a 77-year-old male nursing home resident with suspected renal cell carcinoma (RCC) presenting with severe hypercalcemia (18.7 mg/dL), which was initially presumed to be HHM. However, workup revealed nonsuppressed parathyroid hormone, low PTHrP, and elevated 25-hydroxyvitamin D and 1,25(OH)2D levels. Steroids were initiated due to an inadequate response to bisphosphonate therapy and elevated vitamin D metabolites, resulting in further reduction in serum calcium levels. This case highlights the need to consider multiple concurrent etiologies in the differential diagnosis of severe hypercalcemia, including the possible role of calcitriol-mediated hypercalcemia in RCC.
Identifiants
pubmed: 34513354
doi: 10.7759/cureus.16718
pmc: PMC8405178
doi:
Types de publication
Case Reports
Langues
eng
Pagination
e16718Informations de copyright
Copyright © 2021, Karki et al.
Déclaration de conflit d'intérêts
The authors have declared that no competing interests exist.
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