Which of the following best describes the underlying mechanism of myasthenia gravis?

A 5-year-old boy presents with a slowly enlarging, painless mass in the floor of the mouth. Clinical examination reveals a soft, non-ulcerated submucosal swelling. Imaging shows a well-circumscribed lesion with no bony involvement. Histopathology demonstrates mature, striated muscle fibers with no atypia or mitotic figures.

Which of the following is the most likely diagnosis?

A 55-year-old woman presents with postmenopausal bleeding. Imaging shows a large uterine mass with areas of necrosis and irregular borders. Histology reveals atypical spindle cells with high mitotic figures.

What is the most likely diagnosis?

A 35-year-old woman reports heavy menstrual bleeding and pelvic pressure. Ultrasound reveals a well-circumscribed, hypoechoic uterine mass. What is the most likely diagnosis?

Which of the following is the most important dental consideration when treating a patient with myasthenia gravis?

A 6-year-old boy presents with a rapidly enlarging mass in the orbit. On examination, found the swelling of lymph nodes. Biopsy reveals small round cells with cross-striations. Which of the following is the most likely diagnosis?

Which of the following correctly matches the tumor with its tissue origin and malignancy status?