Adult hypophosphatasia. Diagnostic difficulties and potential therapeutic errors based on a case report
https://doi.org/10.48269/2451-0858-pis-2024-2-015
Abstract
Hypophosphatasia (HPP) is a rare, genetically inherited metabolic disorder caused by a mutation in the tissue-nonspecific alkaline phosphatase (TNALP) gene leading to loss of its function. The clinical presentation is highly heterogeneous, with mild forms often being asymptomatic for long periods. In adults, involvement of bone tissue leads to demineralization, which may result in a misdiagnosis of osteoporosis. In a 69-year-old patient, osteoporosis was initially diagnosed on the basis of abnormal densitometry results and antiresorptive therapy was initiated. Due to bone and joint pain, the patient was admitted to an osteoporosis outpatient clinic, where HPP was diagnosed due to low alkaline phosphatase (ALP) levels, TNALP gene mutation, kidney stones, and early tooth loss. Denosumab therapy was discontinued, while vitamin D supplementation was maintained. This paper emphasizes the necessity of a detailed differential diagnosis, especially in patients with an “osteoporotic” phenotype of the disease, in order to avoid iatrogenic use of antiresorptive medications.
Keywords:
hypophosphatasia , alkaline phosphatase , osteoporosis , bisphosphonates , denosumabDownload files
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Vol. 24 No. 2 (2024)
Published: 2024-12-18
10.31749/2451-0858-SaS

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
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