Based on available reports, the fatality rate among diagnosed cases appears to have been about 1.7% (notably higher than the rate of 0.07% recorded among children with Kawasaki disease in Japan). A rapid risk assessment conducted by the European Centre for Disease Prevention and Control (ECDC) concluded that the overall risk to children in the European Union (EU), European Economic Area (EEA) and the UK "is considered low, based on a very low probability of [the disease] in children and a high impact of such disease. "Clusters of cases of the newly described condition have been recorded 3–4 weeks after peaks in SARS-CoV-2 viral transmission through various local communities. Such observations have been seen to support the concept that SARS-CoV-2 infection may be capable of triggering a severe form of a Kawasaki-like disease. Frequent presentation without prominent respiratory symptoms in children who do not appear to have ongoing SARS-CoV-2 infection but who have already developed antibodies suggests that the disease may be driven by a delayed, post-infectious mechanism.The median age of onset appears to be at least 7 years (compared with 2 years for Kawasaki disease, which primarily affects children under the age of 5). Male children seem to be more frequently affected (broadly in line with Kawasaki disease, where the male to female ratio is about 1.5 to 1). Many affected children appear not to have underlying health conditions, such as asthma or autoimmune disorders, and there have been relatively few reports of known congenital heart disease or preexisting cardiovascular disease.
Renal cyst (kidneys)
Pancreatic cyst
Peritoneal inclusion cyst (lining of the abdominal cavity) - It is a cluster of fluid-filled cysts lining the abdominal cavity of reproductive age women with a history of pelvic, abdominal surgeries, or abdominal inflammation. Those affected maybe presented with an abdominal, pelvic, lower back that lasted for months. Enteric duplication cyst

Central nervous system
Choroid plexus cyst
Colloid cyst
Pineal gland cyst (in the pineal gland in the brain)
Glial cyst
Tarlov cyst (spinal canal)

Musculoskeletal system
Aneurysmal bone cyst, a benign bone tumor with a radiographic cystic appearance. Bakers cyst or popliteal cyst (behind the knee joint)
Mucoid cyst (ganglion cysts of the digits)
Stafne static bone cyst (an anatomic variant with radiographic cystic appearance in the posterior mandible)
Subchondral cyst (cysts near the bony joints)

Seen in various locations
Dermoid cyst (seen in ovaries, testes, and many other locations, from head to tailbone)
Ganglion cyst (hand and foot joints and tendons)
Mucoid cyst (ganglion cysts of the digits)

Infectious cysts
Cysticercal cyst – an infection due to the larval stage of Taenia sp. (Crains backs)
Hydatid cyst – an infection in the liver or other parts of the body due to the larval stage of Echinococcus granulosus (tapeworm)

Neoplastic cysts
Dermoid cyst
Keratocystic odontogenic tumor
Calcifying odontogenic cyst

Treatment
Treatment ranges from simple enucleation of the cyst to curettage to resection. There are cysts—e.g., buccal bifurcation cyst—that resolve on their own, in which just close observation may be employed, unless it is infected and symptomatic.