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| Most common investigating causes of POI | Less common investigating causes of POI |
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| Chromosomal abnormalities (gonadal dysgenesis with or without Turner syndrome) | Part of a multiple endocrinopathy (i) hypoparathyroidism, (ii) hypoadrenalism, (iii) & mucocutaneous candidiasis |
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Premutation of X-chromosome (FMR1 gene) Fragile X syndrome | Autoimmune diseases such as (i) autoimmune lymphocytic oophoritis, (ii) dry-eye syndrome, (iii) myasthenia gravis, (iv) rheumatoid arthritis, (v) systemic lupus erythematosus |
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| Damage from chemotherapy or radiation therapy | Viral infections Galactosemia |
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| Surgical oophorectomy (surgical extirpation) | Sarcoidosis |
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