Tumor-Like Lesions Inflammatory and Reparative Lesions Granulomatous Peritonitis ( Figs. 20.1–20.2 ) ▪ Granulomatous peritonitis, which can be caused by a variety of infectious and noninfectious agents, can result in peritoneal nodules, potentially mimicking disseminated cancer. Most of the following…
Pharynx 12- to 14-cm long musculomembranous tube shaped like an inverted cone Extends from the cranial base to the lower border of the cricoid cartilage (level of the sixth cervical vertebra) Limited superiorly by the posterior part of the body…
Intraoperative consultative diagnosis on mucosal lesions may be performed in the setting of an untreated primary mucosal lesion or in the setting of a recurrent/persistent lesion after prior treatment (i.e., radiation and/or chemotherapy): In general, intraoperative consultation should not be…
General Considerations Similar to tumors of other upper aerodigestive tract sites, the most common tumors of the oral cavity are of epithelial origin: Most common benign tumor is a (squamous) papilloma Most common malignant tumor is squamous cell carcinoma or…
Classification of Non-neoplastic Lesions of the Oral Cavity ( Box 5-1 ) Box 5-1 Classification of Non-Neoplastic Lesions of the Oral Cavity Developmental Cystic Anomalies Nonodontogenic Cysts Nasopalatine duct cyst Median palatal cyst Nasolabial cyst Surgically ciliated cyst Others Nonodontogenic,…
Embryology of the Oral Cavity Primitive mouth or stomodeum develops partly from the surface ectoderm and partly from the endoderm of the cranial end of the foregut (the future site of the pharynx): Initially, the oropharyngeal membrane separates these structures,…
Classification of Neoplasms of the Nasal Cavity and Paranasal Sinus ( Table 3-1 ) Box 3-1 Classification of Neoplasms of the Sinonasal Tract Benign Neoplasms Epithelial Schneiderian papillomas Squamous papilloma (nasal vestibule) Minor salivary gland neoplasms Mesenchymal/Neuroectodermal Lobular capillary hemangioma…
Classification of Non-Neoplastic Lesions of the Sinonasal Tract ( Box 2-1 ) Box 2-1 Classification of Non-Neoplastic Lesions of the Sinonasal Tract Rhinosinusitis Sinonasal polyps: – Nasal (inflammatory) polyps – Antrochoanal polyp Paranasal sinus mucocele Heterotopic central nervous system tissue…
▪ Lesions considered here are characterized by müllerian differentiation on microscopic examination and reflect the metaplastic potential of the pelvic and lower abdominal mesothelium and the subjacent mesenchyme of females (‘secondary müllerian system’). ▪ The müllerian potential of these tissues…
Nasal Cavity Embryology Facial prominences (frontonasal, maxillary, and mandibular) appear around the fourth week of gestation and give rise to the boundaries and structures of the face. Nasal placodes, representing bilateral thickening of the surface ectoderm along the frontonasal prominence,…