Arterial spasm may be a transient affair with no ill-effect. Transient arterial spasm may be sufficiently vicious while it lasts to produce irreparable damage to tissues. Arterial spasm may be associated with an acute painful syndrome. This association appear to be one of cause and effect. Arterial spasm may be prolonged, and in this case it may or may not be associated with evidence of an occlusive vascular Iesion. Spasm of collateral vessels is all-important in these cases.
A case of Hand-Christian-Schuller disease of the mandible is presented in which no other bones were found to be affected. This is an unusual manifestation of the disease, although it has been recorded in some instances that an osteolytic lesion of the mandible is the only X-ray finding and may represent the initial bone lesion in rare cases.