The ischiopubic synchondrosis consists of a hyaline cartilage articulation and typically fuses around the time of puberty. Asymmetric enlargement and lucency of the synchondrosis, often simulating a lytic lesion, is a normal variant which may represent an adaptation to mechanical stress. The lesion resolve with skeletal maturation.

This patient was found to have a spiral fracture of the right tibia (toddler's fracture, not shown), which explained the patient's symptoms.