A 51-year-old patient reports a worst headache of life with sudden onset during activity, followed by neck stiffness. CT head is negative; lumbar puncture shows xanthochromic CSF. Which process explains this presentation?

A 15-year-old girl presents with primary amenorrhea and abdominal pain. Pelvic exam reveals a bulging hymen with retained blood behind it. Which process explains her condition?

A 3-year-old girl is brought in for abdominal swelling. Ultrasound shows a unilateral solid kidney tumor. Which process explains this childhood malignancy?

A 55-year-old woman presents with vaginal bleeding. Endometrial biopsy shows atypical glandular cells. Which process explains her disease?

A 79-year-old woman presents with progressive central vision loss making it hard to read. Fundus exam shows drusen deposits and geographic atrophy in the macula. Which process explains her disease?

A 45-year-old man presents with burning epigastric pain that improves with food but recurs a few hours later. Endoscopy reveals mucosal erosion in the proximal duodenum. Which process explains his condition?

A 67-year-old man presents with progressive dysphagia, weight loss, and aspiration. Barium swallow shows bird-beak narrowing of the distal esophagus. Which process explains his condition?

A 55-year-old man presents with fever, dysuria, and perineal pain. Prostate exam reveals a tender, boggy gland. Urinalysis shows WBCs and bacteria. Which pathophysiologic process explains his illness?

A 70-year-old patient has resting tremor, bradykinesia, cogwheel rigidity, and a shuffling gait. Which pathophysiologic process underlies these findings?

A 72-year-old man presents with gradual bilateral hearing loss. His family notes he cannot hear high-pitched voices. Audiogram shows symmetric high-frequency loss. Which process explains his condition?