The most malignant form of malignant melanoma is ?

Ans. is 'a' i.e. Nodular Schwaz 9/e p415 writes that- "In general, there is no significant difference between different histologic tumor types in terms of prognosis, when matched for tumor thickness, gender, age, or other. Nodular melanomas have the same prognosis as superficial spreading types when lesions are matched for depth of invasion. Lentigo maligna types, however, have a better prognosis even after correcting for thickness, and acral lentiginous lesions have a worse prognosis."