Radiographic and CT features of metallosis in a lame dog after total hip replacement: the cloud sign.
Felix Daniel LucaciPierantonio BattiatoJessica BassiDavide Danilo ZaniDonatella De ZaniAldo VezzoniAngelica StranieriMaurizio LongoPublished in: Veterinary radiology & ultrasound : the official journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association (2023)
A 2-year-old female American Akita was referred for CT of the pelvis and hindlimbs due to a left hindlimb lameness after a left total hip replacement. Referral radiographs and CT images demonstrated amorphous soft-tissue and mineral opacities surrounding the proximal femur and the prosthetic stem, consistent with the "cloud sign" reported as a characteristic of metallosis in humans. Dorsomedial displacement of the prosthetic head, multiple foci of geographic osteolysis alongside the "cloud sign", presumed pseudotumor lesions, and medial iliac lymphadenopathy were also identified with CT. Metallosis was confirmed based on ultrasound-guided cytology, revision surgery, and histopathology.
Keyphrases
- total hip
- total knee arthroplasty
- image quality
- dual energy
- computed tomography
- contrast enhanced
- ultrasound guided
- fine needle aspiration
- positron emission tomography
- soft tissue
- primary care
- minimally invasive
- magnetic resonance imaging
- optical coherence tomography
- acute coronary syndrome
- postmenopausal women
- ionic liquid
- surgical site infection