Ovary 5.1 ATYPICAL PROLIFERATIVE/BORDERLINE SEROUS TUMOR (APST/SBT) VS. NONINVASIVE LOW-GRADE SEROUS CARCINOMA (LGSC)/NONINVASIVE MICROPAPILLARY SEROUS CARCINOMA Atypical Proliferative/Borderline Serous Tumor Noninvasive Low-Grade Serous Carcinoma/Noninvasive Micropapillary Serous Carcinoma Age Mean 49…
Peritoneum/Omentum 6.1 NONINVASIVE IMPLANTS ASSOCIATED WITH SEROUS BORDERLINE TUMOR (Atypical Proliferative Serous Tumor [Typical Serous Borderline Tumor] or Noninvasive Low-Grade Serous Carcinoma [Micropapillary Serous Borderline Tumor]) VS. ENDOSALPINGIOSIS Noninvasive Implants…
Uterine Corpus (Pure Mesenchymal and Mixed Epithelial-Mesenchymal Lesions) 4.1 ATYPICAL LEIOMYOMA VS. LEIOMYOSARCOMA Atypical Leiomyoma Leiomyosarcoma Age 43-45 years (mean) Usually, >50 years Location Uterus Uterus Symptoms Asymptomatic, menorrhagia, or…
Uterine Corpus (Epithelial Lesions) 3.1 MENSTRUAL ENDOMETRIUM VS. ANOVULATION-RELATED ENDOMETRIAL STROMAL BREAKDOWN/DYSFUNCTIONAL UTERINE BLEEDING Menstrual Endometrium Anovulation-Related Endometrial Stromal Breakdown/Dysfunctional Uterine Bleeding Age Reproductive-age women Reproductive-age women; when related to…
Sinonasal Tract/Nasopharynx 8.1 ADENOID CYSTIC CARCINOMA VS. HPV-RELATED CARCINOMA WITH ADENOID CYSTIC-LIKE FEATURES Adenoid Cystic Carcinoma HPV-Related Carcinoma with Adenoid Cystic-Like Features Age Typically adults, peak incidence in sixth decade…
Vulva and Vagina 1.1 VESTIBULAR PAPILLOMATOSIS (HYMENAL TAG) VS. CONDYLOMA ACUMINATUM Vestibular Papillomatosis (Hymenal Tag) Condyloma Acuminatum Age Young women of reproductive age, upon onset of sexual activity Adults and…
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…
