Brief Answer:
The likelihood of cancer is low
Detailed Answer:
Hi TZentz,
An incidental finding of a probable asymmetrical prostate gland is likely nothing. If your husband is older than 60 years, it is probably a benign enlargement. To be sure, I suggest you have his PSA blood level measured. If this blood marker is elevated, he should be seen by a urologist for a transrectal ultrasound.
Hope this helps. Please let me know if you have further questions.