Female, 50 years old, presenting with jaundice. CT shows a 4.8 cm mass involving the periampullary region and pancreas.
H&E, AE1/AE3, Synatophysin, Chromogranin, Ki-67

Female, 44 years old, presenting with severe erythema, radiating white lines, and erosive oral mucosal lesions.
H&E, PAS

Female, 55 years old, presenting with postmenopausal bleeding. 
H&E

Male, 25 years old, presenting with swelling in the left lower gingiva. 
H&E

Female, 37 years old, presenting with bilateral ovarian tumors and ascites.
H&E, PAX8, Calretinin, Claudin4

Male, 56 years old, with a history of stroke one year ago. CT and MRI reveal a 2.5 cm pituitary tumor with sellar and suprasellar extension.
H&E, TTF-1

Male, 18 years old, presenting with abdominal pain and a rapidly growing mass in the small intestine.
H&E

Female, 42 years old, with a solitary, flesh-colored, dome-shaped papule on the right lateral forearm.
H&E

Male, 3 years old, with a painless, soft, slowly enlarging mass on the lower back.
H&E

Female, 34 years old, presenting with fever, dry cough, and progressive shortness of breath.
H&E, GMS