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  Indian J Med Microbiol
 

Figure 1: ALK testing – (A) Positive for ALK re-arrangement and (B) Negative for ALK re-arrangement. Cytomorphological characteristics – (C) A three-dimensional cluster, (D) Sheet-like arrangement with background necrosis, (E) Acinus [red arrow], (F, G) Singly dispersed cells with moderate-to-severe nuclear pleomorphism, and (H) Mucinous morphology with signet ring pattern [A, B: DAB ×100, C, D, F, G: H & E ×100, E: H & E ×200, H: MGG ×100]

Figure 1: ALK testing – (A) Positive for ALK re-arrangement and (B) Negative for ALK re-arrangement. Cytomorphological characteristics – (C) A three-dimensional cluster, (D) Sheet-like arrangement with background necrosis, (E) Acinus [red arrow], (F, G) Singly dispersed cells with moderate-to-severe nuclear pleomorphism, and (H) Mucinous morphology with signet ring pattern [A, B: DAB ×100, C, D, F, G: H & E ×100, E: H & E ×200, H: MGG ×100]