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. Author manuscript; available in PMC: 2016 May 1.
Published in final edited form as: Am J Surg Pathol. 2015 May;39(5):581–591. doi: 10.1097/PAS.0000000000000387

Figure 6. ALK immunohistochemistry highlights infiltrative growth pattern.

Figure 6

A. Case 28. Neoplastic melancotyes are strongly positive for ALK by immunohistochemistry. Inset 1 shows small clusters of melanocytes at a distance from other collections of melanocytes. Inset 2 shows the pseudoglandular configuration of one of these collections of melanocytes at the periphery of the tumor. B. Case 26. Invasion of ALK-positive melanocytes into the deep dermis. Inset shows single cells between collagen bundles at the base of the tumor and nests of melanocytes within arrector pili.