Reported cases of mother-son incest are very rare in the psychoanalytic literature; the fact of such incest, however, may not be so rare as has generally been believed. A detailed case report of the analysis of an adult with a history of severe physical, sexual, and verbal abuse, including consummated incest with his mother during latency, is considered in the context of other reported studies. The author raises some issues of resistance and countertransference that may influence the reporting, treatment, and perhaps even recognition of cases of mother-son incest.