PMC7276588_01
(a) Anterior-posterior pelvic and left hip X-rays in her first appearance in the ER.(b) After childbirth in a surveillance consultation as an outpatient. X-rays with hypotransparency zones in the left proximal femur (white arrows).
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F1
The radiograph revealed an apparent area of hypotransparency of the femoral head (Fig. 1a) and the ultrasound showed presence of moderate joint effusion. In the 2-3 weeks after childbirth, the patient remained symptomatic and repeated X-ray showing a small lithic zone (2 cm x 2 cm) circumscribed to the internal femoral head (Fig. 1b) and to attain further characterization of the lesion an MRI was performed (Fig. 2).
Magnetic resonance imaging after conservative treatment with almost complete resolutions of aforementioned findings.
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F3
In February 2014 (20 months after childbirth), she presented a considerable improvement of the complaints, with good mobility/function of the left hip joint, with no need for walking aid, and with a second MRI revealing reduction of intra-articular free fluid and downsizing of the extensive signal change that affected almost the entire left femoral head, which had a size of 1 cm x2 cm (Fig. 3).