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 32-year-old man presents with eye pain, photophobia, and decreased vision. He recently recovered from a viral URI. Slit-lamp exam shows dendritic corneal ulcer. Which process explains his condition?

A 7-year-old boy presents with short stature, delayed bone age, and poor growth velocity. Labs: GH stimulation test shows low growth hormone levels. Which process explains his growth failure?

A 65-year-old woman presents with progressive memory loss, disorientation, and language difficulties. MRI shows cortical atrophy, and CSF has decreased amyloid beta-42. Which process explains her dementia?

A 45-year-old woman presents with left-sided facial paralysis after a viral prodrome. Exam shows inability to close her left eye or wrinkle the forehead. Which process explains her acute condition?

A 64-year-old man presents with progressive peripheral vision loss. Intraocular pressure is 28 mmHg (normal 10–21 mmHg). Optic disc cupping is present. Which process explains his disease?

A 64-year-old patient reports morning headaches, nausea, and brief episodes of blurred vision. Funduscopic exam shows papilledema. MRI reveals a frontal lobe mass with surrounding vasogenic edema. Which process explains the symptoms?

A 28-year-old man presents with generalized tonic–clonic seizures. MRI shows a ring-enhancing lesion with surrounding edema. Which process explains his presentation?

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