A 78-year-old male patient presents with abdominal pain and hepatomegaly. The pain is severe and using a number rating scale (NRS 0-10) for abdominal pain the score is 6-7, and with no association to food intake. The pain has been present for more than 12 months with worsening over the last 3-4 months. The patient has also the impression of progression of hepatomegaly. The serum liver tests are normal apart from slightly elevated alkaline phosphatase. At physical examination there is marked hepatomegaly (20 cm in the right medioclavicular line). Ultrasound and later a CT-scan demonstrate a single 13 cm simple cyst in the right liver lobe. You perform aspiration sclerotherapy of the cyst.

Which follow-up program will you recommend the patient?