Osteoid osteoma of the femoral neck mistaken as a synovial herniation pit.

Radiol Case Rep

UConn Health Orthopedics and Sports Medicine, , 263 Farmington Ave, Farmington, CT 06030, USA.

Published: December 2021

A 36-year-old man presented with 1 year of atraumatic left lateral thigh, groin, and hip pain, and imaging consistent with the diagnosis of femoroacetabular impingement and a labral tear. Imaging concurrently demonstrated a synovial herniation pit. The patient underwent hip arthroscopy, which included femoroplasty, acetabuloplasty, labral debridement, and synovectomy. His pain persisted and further workup confirmed an osteoid osteoma that was mimicking a synovial herniation pit. The osteoid osteoma was treated with radiofrequency ablation. At 18 months follow-up, the patient reported complete resolution of his symptoms. We present the case to highlight distinguishing imaging and clinical findings of these similar-appearing lesions. While neither condition is particularly rare individually, the misidentification of osteoid osteoma as a synovial herniation pit is a unique feature of this case that lead to the patient's protracted clinical course.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8517282PMC
http://dx.doi.org/10.1016/j.radcr.2021.08.058DOI Listing

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