
EUS-guided Ablation of Pancreatic Cyst Neoplasms
Pancreatic CystThis is a registry that will maintain prospective data on the clinical outcomes of all patients with pancreatic cyst lesions who undergo EUS-guided alcohol ablation.

Evaluation of Faisability, Safety and Effectiveness and of Discogel in Patients With Aneurysmal...
Bone CystsThere is no consensus in the scientific literature for the treatment of aneurysmal and simple bone cysts. Some scientific articles with utilisation of sclerosis agents for the treatment of aneurysmal bone cysts: Ethibloc no longer marketed, pure Ethanol, Aetoxisclerol.

Treatment of Epidermoid Cysts
Epidermoid CystThe objective of this study is to determine the efficacy, safety, tolerability, and patient satisfaction associated with the treatment of epidermoid cysts with injected 1.5% sodium tetradecyl sulfate (STS) foam.

A Trial of Norethisterone Acetate and Expectant Management in Treatment of Simple Ovarian Cysts...
Ovarian Cyst SimpleTo compare the effectiveness of (norethisterone acetate) in the treatment of spontaneously occurring simple ovarian cyst detected by ultrasonography compared with expectant management.

Diagnosing Ovarian Cysts - the DOC Study
Ovarian CystsOvarian Cancer2 moreBackground: Ovarian cysts are common in women. The vast majority is benign; yet, ovarian cancer (OC) is seen in 500 women every year in Denmark. OC is often diagnosed in advanced stages, and OC is the fifth most deadly cancer in women in more developed countries. It can be a clinical challenge to distinguish benign ovarian cysts from OC. Currently, the Risk of Malignancy Index (RMI) is used to detect women at high risk of OC in Denmark, however, new methods to correctly differentiate benign ovarian cysts from OC at an early stage is needed. New promising studies suggest an improved diagnostic accuracy by adding the biomarker Human Epididymis Protein 4 (HE4) and systemized ultrasound imaging International Ovarian Tumor Analysis (IOTA). Purpose: The purpose is to evaluate the diagnostic performance of HE4 and IOTA in a Danish clinical setting. Furthermore, to develop an optimized diagnostic algorithm to differentiate ovarian cysts based on a combination of symptoms, biomarkers and IOTA. Methods: The study is a prospective, observational study. Women with ovarian cysts are included from gynecological practitioners and departments in the Capital Region of Denmark. Detailed information on health and symptoms are registered, and the cysts are systematically described by the gynecologist in accordance to the IOTA terminology. HE4 will be analyzed in those women who routinely needs a diagnostic blood test for CA125. Data will be coupled with data from the patient file and Danish Gynecological Cancer Database (DGCD). The diagnostic utility of HE4 and IOTA will be evaluated both alone and in combinations with health information, symptoms, and CA125. The study has been approved by the Regional Committee on Health Research Ethics (H-19021342) and the Data Protection Agency (P-2019-340). Significance: This study establishes a unique database which will form the basis for developing an optimized method for differentiating ovarian cysts, and thus optimize referral and diagnosis.

A Prospective Observational Study of Foam Sclerotherapy .
Autosomal Dominant Polycystic KidneyRenal Cyst2 moreAn observational prospective study to determine the impact of foam sclerotherapy of large, dominant kidney/liver cysts on quality of life outcomes and kidney/liver cyst volumes at up to 12 months of follow-up in patients with autosomal dominant polycystic kidney disease (ADPKD) and autosomal dominant polycystic liver disease (ADPLD).

Polycystic Liver Disease Registry (UK)
Polycystic Liver DiseaseMulticentre, observational registry studying the natural course of polycystic liver disease.

Surveillance of Complex Renal Cysts - The SOCRATIC Study
Complex Renal CystOne third of individuals aged >60 years will be diagnosed with at least one renal cyst following abdominal imaging. These cystic lesions are categorized according to the Bosniak classification which categorizes cysts according to their degree of complexity and risk of malignancy. Growing evidence suggests that a significant proportion of Bosniak III and IV cysts are benign and that the malignant ones present low metastatic potential. Since renal surgery carries substantial morbidity (20%) and potential mortality (0.5%), active surveillance has gained attention as a potential tradeoff to surgery to overcome overtreatment. Therefore, prospective studies of long-term follow-up are needed to confirm the oncologic safety of this strategy for patients with Bosniak III/IV cysts. This is an multicenter prospective observational longitudinal study. The main objective is to compare the 5-year follow-up cancer-specific survival between the active surveillance and the surgical groups.

Timing of Operation in Children With a Prenatal Diagnosis of Choledochal Cyst
Choledochal CystIn this prospective study, we tried to select the operation time according to the cyst size and evaluate the treatment effect.

Coenzyme Q10 and Dentoalveolar Cyst
CystJaw10 patients in each group will undergo cyst removal under local anesthesia. After cyst removal, the cystic cavity will be filled with placebo gel in the control group or coenzyme gel in the coenzyme group. Bone density and volume will be assessed by cone beam CT immediately postoperative and 6months later for all patients