All are causes of osteoporosis except -

Osteoporosis Osteoporosis is a disease characterized by increased porosity of the skeleton resulting from reduced mineral mass. Important causes of osteoporosis Primary Postmenopausal Senile Idiopathic Secondary Endocrine disorders Hyperparathyroidism Thyrotoxicosis Hypogonadism Cushing syndrome DM type 1 Addison diseases Neoplasia Multiple myeloma Carcinomatosis Gastrointestinal Malnutrition and malabsorption Vit. C, D deficiencies Important drugs Heparin Glucocorticoids Lithium Cyclosporin Gn RH agonists Anticonvulsants Alcohol Others Osteogenesis imperfecta Immobilization Homocystinuria Rheumatological disease