Yes I have had this on and off for years. My GP said it was costochondritis even though it was just in one place, although a locum once said it was breast related. Nothing showed up in my bone scan. Last year it moved to different ribs on the other side and this year my whole chest wall was inflamed and tender to touch and that was definitely AS as it has responded to prednisone and humira.
Peripheral and axial AS diagnosed October 2011 aged 50, more than 15 years after the symptoms started. Also PCOS, GERD/oesophagitis/dysphagia, IBS, asthma,chronic rhinitis. Taking enbrel, methotrexate, meloxicam prn, folic acid, omeprazole, vitamin D, metformin, steroid inhaler & nasal spray and eating low starch/low GI.