More than 2 dozen other genes have been reported to be mutated in rare cases of PTFL but in general the genetic abnormalities found in this disorder are fewer and less complex than those in other types of FL. PTFL has an indolent, relapsing and remitting course with a 5-year survival rate of >95%. Patients diagnosed with PTFL have been treated with chemotherapy, surgery, and combinations of these treatments. In general, these patients did well (100% survival with <5% of cases relapsing regardless of treatment modality). More recently, 36 patients have been treated with surgical resection alone followed by observation; all these patients survived with only one having a relapse. Thus, PTFL appears to be a highly indolent type of FL in which multiple studies have reported overall and progression-free survival rates of 100% and >90%, respectively, for >2 years and an estimated probability of 5-year event-free survival rate of ~96%. The therapeutic regimens versus follow-up observations that best treat this disorder in children, adolescents, and adults (adults may require different treatments than children and adolescents) requires further study. Primary follicular lymphoma of the testis
Primary follicular lymphoma of the testis (PFLT), also termed testicular follicular lymphoma, was classified as a distinct form of FL by the World Health Organization in 2016. It is an extremely rare disease that has been recognized as occurring primarily in children and adolescents but also has been reported in 5 adults.
Immersion may refer to:

The arts
"Immersion", a 2012 story by Aliette de Bodard
Immersion, a French comic book series by Léo Quievreux
Immersion (album), the third album by Australian group Pendulum
Immersion (film), a 2021 Chilean thriller film
Immersion (series), a webseries which test the concepts of video games in real life, created by Rooster Teeth Productions
Immersion journalism, a style of journalism

Science and technology
Immersion lithography or immersion microscopy, optical techniques in which liquid is between the objective and image plane in order to raise numerical aperture
Immersion (mathematics), a smooth map whose differential is everywhere injective, related to the mathematical concept of an embedding
Immersion (virtual reality), the perception of being physically present in a non-physical world, created by using VR

Other uses
Immersion baptism, a type of baptism whereby the subject is immersed in water
Immersion Corporation, a haptic technology developer
Immersion heater, a kind of water heater
Immersion therapy, overcoming fears through confrontation
Language immersion, a method of teaching a second language in which the target language is used for instruction