IMAGING DIAGNOSIS—EQUINE MAST CELL TUMOR

Equine mast cell tumors are typically benign solitary growths of the head, neck, trunk, or limbs. When involving the limbs, these masses tend to be adjacent to joints without involving them. In radiographs there is often a well-circumscribed soft tissue mass with granular mineralization. The Arabian breed appears to be over represented. Surgical removal is usually curative. In this report, we describe the diagnosis, clinical features, and management of mast cell tumors in the rear limb of a horse.     

EXPERIMENTAL ADENOVIRUS PNEUMONIA IN CALVES

A mild interstitial pneumonia with mononuclear cell infiltration was produced in calves following intra-tracheal inoculation of the BIL adenovirus. Viral antigen appeared early in regional lymph node. An interstitial reaction developed early in the lungs, and pneumonic lesions and infective virus were present by the third day after inoculation. Virus spread rapidly trachea, tonsils and nasal mucosa, and was creted from the third to eighth day. Upper and lower respiratory tissues continually harboured virus until the 12th day, when the experiment was terminated. The virus was isolated from the livers of two calves. All tissues yielded low concentrations of virus, and only the lung showed pathological reactions. The reactions were qualitatively similar to known adenovirus pneumonias, but considerably milder, and lacked the characteristic necrotic and proliferative bronchiolar changes.     

Partial chromatographic separation of pentose- and deoxypentosenucleic acids

From a mixture of tobacco mosaic virus pentosenucleic acid (RNA) and calf thymus deoxypentosenucleic acid (DNA) (2 mg each), 73 percent of the RNA was separated free of DNA by discontinuous elution chromatography with phosphate buffers at pH 6.7 on columns of calcium phosphate.