A tumor sits on your stage, the differential is real, and the sign-out clock is running. One wrong call — a mesothelioma signed out as adenocarcinoma, a bland nested carcinoma dismissed as benign, a low-grade sarcoma underdiagnosed because the MDM2 was not checked — changes everything that follows for that patient. This handbook gives you a repeatable, anchor-driven diagnostic method for every major tumor category, built for the pressure of real sign-out. • Signature-first pattern recognition — identify the defining morphologic pattern before ordering a single stain, across all 19 organ-system chapters • Panel logic that preserves tissue — build targeted immunopanels from the morphologic differential, not untargeted batteries that exhaust limited biopsies • The mimic, named every time — the closest look-alike and the single discriminating feature are stated explicitly for every entity • WHO 5th-edition integrated — molecularly defined entities, reclassified nomenclature, and the integrated CNS framework built into every relevant chapter • Fusion genes decoded at the bench — immunohistochemical surrogates for STAT6, TLE1, pan-Trk, MYB, NKX2.2, H3.3, and dozens more, with the molecular confirmation logic behind each • Control-anchored interpretation — p53 patterns, null results, MMR paired-loss, and p57 all taught as the validated rules they are • The Diagnostic Signature Master Atlas — every committing anchor from every chapter consolidated into one scannable back-of-book reference For anatomic pathology residents, fellows, and practicing surgical pathologists who refuse to guess at the microscope. Add it to your bench. Your next difficult case will not wait.
