RT Journal Article SR Electronic T1 Spontaneous psoas haematoma secondary to antiplatelet therapy: a rare cause of atraumatic hip pain JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e228973 DO 10.1136/bcr-2018-228973 VO 12 IS 4 A1 Thomas Key A1 Charles Kimberley A1 Robert Rietz A1 Stuart William Roy YR 2019 UL http://casereports.bmj.com/content/12/4/e228973.abstract AB A 92-year-old woman with previous total hip replacement presented with sudden onset of atraumatic hip pain and inability to weight bear. In the absence of radiographic signs of fracture, loosening or biochemical evidence of infection a CT scan of the pelvis and hips was performed, which showed psoas thickening. MRI identified two separate collections related to the psoas and greater trochanteric regions. Ultrasound-guided aspiration was performed to rule out infection and demonstrated a haematoma. In contrast to previously reported cases caused by anticoagulant therapy or inherited coagulopathy, this case was secondary to single antiplatelet agent treatment alone. In the increasingly co-morbid ageing population with associated polypharmacy, aspirin is a common primary and secondary prevention treatment. In patients with atraumatic hip pain, spontaneous psoas haematoma due to antiplatelet therapy should be considered and investigated appropriately.