Abstract
ABSTRACT Osteopetrosis encompasses rare inherited metabolic bone disorders with defect in the osteoclast activity. Severe forms of presentation such as malignant infantile osteopetrosis are seen in infants and milder forms in older children. The clinical presentation includes failure to thrive, severe pallor, optic atrophy and hepatosplenomegaly. The disorder is characterised by dense bone on radiography, hence the name marble bone disease. A 10-month-old boy who presented with developmental delay, failure to thrive, nystagmus (which the mother described as wandering eye movements), splenomegaly of 16 cm and hepatomegaly of 8 cm. Investigations demonstrated severe anaemia (5.7 g/dL) and thrombocytopenia (34 x 109/L). Radiological signs which help in the diagnosis include diffuse sclerosis, bone within bone appearance, sandwich vertebrae and Erlenmeyer flask deformity. Plain radiography is an easily available and cost effective tool which can aid in the diagnosis of osteopetrosis.
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