Slipped capital femoral epiphysis in an adult with an unidentified Kallmann syndrome. Case report and etiology literature review.

A 23-year-old male consulted for a subacute-onset left hip pain, being evident on radiographs a slipped capital femoral epiphysis (SCFE) while the contralateral proximal femur physis was still slightly open. Urgent percutaneous in-situ fixation with two cannulated screws was performed. Further investigations due to the atypical features of the case revealed that the patient had anosmia, which allowed for Kallmann syndrome (KS) diagnosis, being responsible for the delayed skeletal maturity of the patient. Very few cases of a delayed-onset SCFE in association with KS have been described in the literature but must be considered in the differential diagnosis.