Imaging Diagnosis—radiography and Computed Tomography of Radioulnar Ischemic Necrosis in a Jack Russell Terrier

Abstract

A 7-year-old Jack Russell Terrier with a history of minor trauma was presented for lameness of the left forelimb. Radiography and computed tomography demonstrated a localized radioulnar osteolytic lesion with cortical bone loss and enthesiophytes. Based on results of diagnostic imaging and histopathological examination, the final diagnosis was radioulnar ischemic necrosis (RUIN), complicated by pathologic fracture. A rare disorder of unknown etiology, RUIN may be secondary to tearing of the interosseous ligament and potential ischemia. It should be differentiated from neoplastic or fungal disease. To the authors´ knowledge, this is the first canine case report describing RUIN.

Urethral obstruction due to an inflammation and necrosis in the os penis of a dog

“…There are two other case reports of dogs with radioulnar ischemic necrosis, which had a similar radiographic appearance to the lesion of the case presented here 29 . One of those patients was presented due to a pathologic fracture and was treated with a bone plate and screws, 29 and the other one was treated conservatively with a splint and rest 30 . Both dogs made full recovery.…”

“…29 One of those patients was presented due to a pathologic fracture and was treated with a bone plate and screws, 29 and the other one was treated conservatively with a splint and rest. 30 Both dogs made full recovery. A bone infarction seems to be the most likely reason for the lesion seen in the patient of this case report, even though it was not possible to re-examine the patient and it cannot be ruled out if there was metastatic disease at the time of humane euthanasia.…”

Radioulnar Ischaemic Necrosis in a Dog with Concurrent Osteomyelitis and Bone Sequestration

“…21,22 Radioulnar ischaemic necrosis is defined as osteonecrosis of the radius and/or ulna in the dog due to ischaemic injury of unknown aetiology. 1 Radiographically, RUIN lesions appear as osteolytic lesions on the opposing radial and ulnar cortices. The caudal interosseous artery feeds the intramedullary blood supply of both the radius and ulna.…”

“…Radioulnar ischaemic necrosis (RUIN) is a term that has been used to describe osteonecrosis secondary to ischaemia of the radius and ulna in the dog. 1 There is a small amount of data in the literature describing the radiographic appearance of a RUIN lesion. 1 Osteonecrosis in dogs has also been reported to occur with Legg-Calves-Perthes, idiopathic osteonecrosis of the carpal bone and maxillofacial osteonecrosis.…”

“…1 There is a small amount of data in the literature describing the radiographic appearance of a RUIN lesion. 1 Osteonecrosis in dogs has also been reported to occur with Legg-Calves-Perthes, idiopathic osteonecrosis of the carpal bone and maxillofacial osteonecrosis. [2][3][4] This is the first case report of concurrent haematogenous osteomyelitis and ischaemic necrosis occurring at the site of a lesion that is radiographically consistent with RUIN.…”