Pediatric NMZL

Long story short, got Pediatric NMZL, 36yrs male. Swollen Lymph nodes on right side of neck. Surgical biospy done. CT shows swollen lymph nodes on both sides of neck. PET scan normal. Bone marrow biospy normal. My question is does the NMZL diasppear after the excisional biopsy? If cancer was present, would it have shown up on PET scan? What is the current treatment for stage 1A, asymptomatic? Not a whole lot of info/research on this rare type.

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