Cancer ------ Cancer occurs in snakes, but the number of reports is quite limited. Some of the tumors have been diagnosed on living snakes, but most were diagnosed at the time of autopsy. As with mammals, tumors of snakes can be benign or malignant and originate from any organ or tissue of the body, including blood. Boa constrictors seem to be more often affected by cancer than other snakes commonly kept in captivity. This observation, however, may be the result of the disproportionately large number of boa constrictors kept by hobbyists because of their tremendous popularity. It is interesting to note, however, that most life-threatening malignancies that we have diagnosed in snakes have involved boa constrictors. Snake owners must be vigilant and seek prompt veterinary help when a growth or lump is detected on their snake(s) (especially if a boa constrictor is involved). Mole-like growths have been especially troublesome in our experience. Wounds that fail to heal despite treatment should make owners equally suspicious.