What does artifact on the proton axial sequence suggesting a longitudinal split mean on a mri? what does fluid in the subdeltoid and subacromial bursa

Possible tear: From your question it sounds like the images show something along the length of a tendon that could be from artifact or a tear. Fluid in the subdeltoid and subacromial bursa are secondary findings of a rotator cuff tendon tear. Rotator cuff tendon tear can happen in along the grain of the tendon (a longitudinal split) or across the grain of the tendon which shows up as a discontinuous tendon.