What is occult neuroblastoma?

Asymptomatic: An occult neuroblastoma is a type of brain tumor that does not cause any symptoms.

No symptom nerve Ca: Neuroblastoma is most common solid cancer in children developing outside the brain + most common cancer in kids<2 years-of-age. Now can present at prenatal ultrasound & confirmed after birth. Most commonly occur in adrenal gland, but also in abdomen, chest and in tissue of sympathetic nervous system. Occult cases are non-symptomatic eg found by serendipity at abdo. Ultrasound or feeling a lump.

Difficult to say: Neuroblastoma is a pathological diagnosis depending upon a certain tissue type. It may be referring to a variant of neuroblastoma, since neuroblastoma is well known to evolve into more mature or less malignant tissue types like ganglioneuroma. Etc.