Abstract Discussion Vitamin-D (Vit-D)-dependent rickets are the result of a deficiency in 1-alpha hydroxylase. It is a rare condition that is typically diagnosed in childhood. We present a case of Vit-D-dependent rickets that was detected in adulthood after pregnancy. Clinical Case A 25-year-old female patient has been sent from the neurosurgical clinic to the endocrinology department for evaluation of Vit-D deficiency, which is believed to be causing muscle weakness. She experienced chronic lower back discomfort that began two years ago. She experienced challenges when going down stairs and when bending her body forward. Rest alleviated the lower back pain, whereas physical activity exacerbated it, and it did not interfere with her sleep. The weakness in the legs was there with it. There was no previous fractures or other form of physical injury. The woman's issues became evident after her pregnancy. She consulted a physician nine months postpartum, following the birth of a robust infant. The patient's personal and family history was unremarkable. She had no smoking or drinking habits. During the physical examination, the patient stood 150cm tall and weighed 60kg. Except for left lower extremity muscle strength, which was 3-4/5 on the neurological assessment, everything else was normal. In her laboratory results; calcium 8 mg/dl (8.8-10.6), ionized calcium 3.61mg/dL (4.6-5.0), albumin 4.7 g/dl (3.5-5.2), phosphorus 2.1 mg/dl (2.5-4.5), parathormone 640 ng/L (12-88), creatinine kinase 50 U/L (0-145), alkaline phosphatase 345 U/L (33-98), 25-OH Vit-D 24.2 ug/L, leukocyte: 7100/uL, hemoglobin 11.6 gr/dl, thrombocyte 336000/uL, ALT: 6.6 U/L, osteocalsin: 65 ng/mL (11-48), 1,25-OH Vit-D level: 43.1 pg/mL (15-90). Computed CT revealed type H vertebrae in the thoracic vertebrae, with no disease found in the lumbar, cervical, pelvic, or femur. (Figure 1). Bone density (BD): L1-L4 Z score: -2.7 BMD: 0.858; Femoral neck Z score: -2.7 BMD: 0.644. The EMG results were consistent with moderate myopathy. After one year of complaints, she became wheelchair-dependent. At that point, a neurosurgical doctor prescribed Vit-D and calcium tablets. She was able to walk again in two months and referred to our clinic two years after the initial issue. Genetic testing revealed that CYP27b1>homozygous positive was compatible with Vit-D dependent Rickets Type 1. During the two-year diagnostic period, the patient's height dropped from 153 cm to 150 cm. Calcitriol 0.25 mcg was administered every other day. Her calcium level: 9.4 mg/dL and phosphorus level: 2.2 mg/dL following treatment. This type of rickets is caused by a lack of the 1-alpha hydroxylase enzyme, which is essential for Vit-D production in the kidney. Untreated patients may have muscular and bone abnormalities. It is a sickness that responds exceptionally well to treatment.Figure 1:Vertebral lateral X -ray revealed H shaped vertebrae
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