Final answer:
Observation is the usual treatment for a corpus luteum cyst without complication, as these cysts typically resolve on their own.
Step-by-step explanation:
The treatment for a corpus luteum cyst without complication is generally observation. These cysts are usually benign, functional, and resolve on their own. In most cases, doctors monitor the cyst over some time through ultrasound to check if it decreases in size or resolves without intervention. However, if a corpus luteum cyst becomes symptomatic or complications arise, such as rupture or torsion, medical intervention might be necessary. In those cases, treatment options could include pain management or surgical approaches.