摘要:

A series of CT imaging experiments was performed to test the hypothesis that when the tympanic bulla is filled with fluid there would be a false impression of bulla wall thickening. CT images were obtained before and after introduction of water in the tympanic bulla of a fresh canine cadaver. Images were acquired using different mA settings, slice thicknesses, reconstruction algorithms, and displayed at different window widths. The wall of the fluid filled bulla appeared thicker than that of the air filled bulla. This artifact was also demonstrated on a phantom composed of a thin (0.5 mm) and a thick (5 mm) piece of aluminum imaged in air and water. The effect was more apparent when images were acquired as thick slices (>5 mm), reconstructed with a soft tissue algorithm, or displayed with a narrow window (<250 CT numbers). The radiologist must be aware of this artifact when interpreting CT images of the tympanic bullae.

ISSN:1058-8183    

DOI:10.1111/j.1740-8261.1996.tb01201.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

This report describes the use of computed tomography (CT) to evaluate the inner ear, tympanic bullae, nasopharyngeal area, and external ear canals of three cats. All cats presented for evaluation of upper respiratory signs or chronic ear infection. Nasopharyngeal masses were present in two cats, and a mass in the external ear canal was present in the third cat. In all three cats, CT was able to define the extent of osseous bulla involvement, which was confirmed at surgery. Computed tomography also defined the extent of the polyp in the nasopharyngeal area in two cats, and in the external ear canal in one cat. Surgical removal of the polyps was accomplished with a combined oral approach and ventral bulla osteotomy in cats 1 and 2. The polyp was removed from cat 3 using a combination of ventral bulla osteotomy and excision of the mass through the external ear canal. Microscopic examination confirmed all masses as nasopharyngeal (inflammatory) polyps.

ISSN:1058-8183    

DOI:10.1111/j.1740-8261.1996.tb01202.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

ISSN:1058-8183    

DOI:10.1111/j.1740-8261.1996.tb01203.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

ISSN:1058-8183    

DOI:10.1111/j.1740-8261.1996.tb01204.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

ISSN:1058-8183    

DOI:10.1111/j.1740-8261.1996.tb01205.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

A 5 year old Arabian mare was evaluated for a non‐painful swelling located dorsal to the right carpus which had been present for 2 years. Radiographically, multiple mineralized bodies were identified dorsal to the distal radius and carpus in the region of the tendon sheath of the extensor carpi radialis muscle. The radiographic appearance of the carpal bones was within normal limits. On ultrasound examination, multiple hyperechoic foci with posterior shadowing were seen adjacent to the extensor carpi radialis tendon. There was minimal distension of the tendon sheath and no abnormalities within the substance of the extensor carpi tendon were identified. Considering the radiographic and sonographic findings, a presumptive diagnosis of tenosynovial osteochondromatosis was made. Histological confirmation of this diagnosis was not obtained as the owner declined further diagnostic evaluatio

ISSN:1058-8183    

DOI:10.1111/j.1740-8261.1996.tb01206.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

ISSN:1058-8183    

DOI:10.1111/j.1740-8261.1996.tb01207.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

Radiographic examination proved incapable of determining the extent and severity of chronic sinusitis in a goat. Computed tomography was subsequently used to clearly define the nature and extent of the lesion.

ISSN:1058-8183    

DOI:10.1111/j.1740-8261.1996.tb01208.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

Ante mortem diagnosis of portal vein thrombosis was determined ultrasonographically in four dogs. In each dog the thrombus was visible in two‐dimensional, grey‐scale images of the portal vein obtained through a right intercostal window. Duplex‐Doppler measurements and color‐Doppler images provided information about the effects of thrombosis on portal blood flow. Reduced portal blood flow compatible with portal hypertension was detected in three dogs. A hypercoagulable state was probably involved in the pathogenesis of portal vein thrombosis in two dogs, one with pancreatitis and gastrointestinal blood loss and another with protein‐losing nephropathy and probable immune‐mediated anemia. The third dog had chronic ehrlichiosis; thrombosis was probably secondary to vasculitis. The remaining dog had thrombosis secondary to invasion of the portal vein by a recurrent duodenal neoplasm. This dog was euthanized because the tumor was considered inoperable. The dog with pancreatitis developed acute portal hypertension due to obstruction of the portal vein by the thrombus and was euthanized. The dogs with protein‐losing nephropathy and ehrlichiosis were treated medically and recovered. Although portal vein thrombosis is uncommon, this complication should be considered in dogs with a variety of abdominal or systemic disorders. Ultrasonography is a practical method for diagnosis of portal vein thrombosis and detection of the und

ISSN:1058-8183    

DOI:10.1111/j.1740-8261.1996.tb01209.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

ISSN:1058-8183    

DOI:10.1111/j.1740-8261.1996.tb01210.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY