Thyroid and Parathyroid Glands 9.1 ANAPLASTIC (UNDIFFERENTIATED) THYROID CARCINOMA VS. LARYNGEAL SQUAMOUS CELL CARCINOMA INVOLVING THYROID GLAND Anaplastic (Undifferentiated) Thyroid Carcinoma Laryngeal Squamous Cell Carcinoma Involving Thyroid Gland Age Typically…
Oral Cavity 5.1 ACANTHOLYTIC VARIANT OF SQUAMOUS CELL CARCINOMA VS. ANGIOSARCOMA Acantholytic Variant of Squamous Cell Carcinoma Angiosarcoma Age Typically elderly adults Typically elderly adults Location Most common in the…
Salivary Glands 1.1 ACINIC CELL CARCINOMA VS. MAMMARY ANALOGUE SECRETORY CARCINOMA (MASC) Acinic Cell Carcinoma Mammary Analogue Secretory Carcinoma (MASC) Age Wide range, with slight peak in seventh decade. Slight…
Neck/Soft Tissue 4.1 BRANCHIAL CLEFT CYST VS. METASTATIC HPV-RELATED SQUAMOUS CELL CARCINOMA Branchial Cleft Cyst Metastatic HPV-Related Squamous Cell Carcinoma Age Most commonly young adults. Rare in adults older than…
Oropharynx 6.1 HPV-RELATED SQUAMOUS CELL CARCINOMA VS. CONVENTIONAL SQUAMOUS CELL CARCINOMA HPV-Related Squamous Cell Carcinoma Conventional Squamous Cell Carcinoma Age Adults with peak in fifth and sixth decades Adults with…
Odontogenic/Bone 2.1 AMELOBLASTOMA VS. AMELOBLASTIC CARCINOMA Ameloblastoma Ameloblastic Carcinoma Age Wide age range, peak in fourth to fifth decades Most cases arise in adults, with peak in fifth to sixth…
Invasive Carcinoma: Special Types and Important Considerations 6.1 PURE TUBULAR CARCINOMA VS. RADIAL SCAR Pure Tubular Carcinoma Radial Scar Age Any age, more often in postmenopausal women Adult women, overlapping…
Vascular Lesions 10.1 PERILOBULAR CAPILLARY HEMANGIOMA VS. ANGIOLIPOMA Perilobular Capillary Hemangioma Angiolipoma Age Middle age or older women Any age Location Anywhere in the breast Breast subcutaneous tissue, rarely mammary…
Benign and Reactive Stromal Lesions 8.1 PSEUDOANGIOMATOUS STROMAL HYPERPLASIA VS. STROMAL FIBROSIS Pseudoangiomatous Stromal Hyperplasia (PASH) Stromal Fibrosis Age Any age, usually premenopausal women, association with contraceptive use; postmenopausal women…
