We describe the case of a patient who, after a traumatic experience at
the age of 12, had a series of anniversary depressive episodes at 16,
17, 18 and 19 years of age, followed by a series of anniversary manic
episodes at the ages of 21, 23, 24, 25 and 26 years. All of these epi
sodes occurred almost always a few days before or after the date of th
e accident and only when the patient was residing in his home town, th
e place of the traumatic event. The case fulfills the DSM-III-R criter
ia for seasonal mood disorder, but differs from previously described c
ases in that: (a) both depressive and manic episodes developed at the
same time of the year, and (b) the illness was precipitated by psychos
ocial factors rather than climatic conditions.