Which type of PED typically does not show leakage on FA?

In the context of type of pigment epithelial detachment (PED) that typically does not show leakage on fluorescein angiography (FA), the serous PED is the most appropriate answer.

Serous PEDs result from subretinal fluid accumulation and are often associated with conditions like central serous chorioretinopathy or inflammatory processes. On fluorescein angiography, these detachments do not usually exhibit leakage because the underlying Bruch's membrane remains intact, allowing for the accumulation of fluid without significant vascular compromise or disruption.

In contrast, other types of PEDs, such as drusenoid, fibrovascular, and hemorrhagic PEDs, often display leakage on FA. Drusenoid PEDs are typically associated with the presence of drusen and can lead to leakage due to retinal pigment epithelium changes. Fibrovascular PEDs involve abnormal blood vessel growth that can result in fluid leakage. Hemorrhagic PEDs, as the name suggests, are characterized by hemorrhage that can certainly lead to leakage on FA.

Thus, serous PEDs maintain the integrity of Bruch's membrane and generally do not exhibit the leakage that characterizes the other types listed.