Abstract
BACKGROUND: Camurati-Engelmann disease (CED), also known as progressive diaphyseal dysplasia, is a rare genetic disorder characterized by abnormal thickening of the long bones' diaphysis. This condition is caused by mutations in the transforming growth factor beta-1 (TGFB-1) gene and is typically inherited in an autosomal dominant pattern. Patients with CED often present with symptoms such as chronic bone pain, muscle weakness, fatigue, and difficulty walking. CASE PRESENTATION: We report a 30-month-old boy who presented with gait abnormality. Initially, toxic synovitis was considered, and non-steroidal anti-inflammatory (NSAİ) treatment was administered. The patient did not respond to NSAİ treatment. Direct radiographs showed diaphyseal thickening, especially in the long bones. Radiologically, CED was suspected, and clinical exome sequencing identified a TGFB-1: c1121C > G (Pro374Arg) heterozygous mutation, which was interpreted as a possible pathogenic variant for CED. A clinical, radiologic, and genetic diagnosis of CED was made. CONCLUSION: Due to its rarity and variable clinical presentation, the diagnosis of CED can be challenging and often requires a high index of suspicion. Early and accurate diagnosis is crucial for managing symptoms and improving patients' quality of life.