Chronic pulmonary aspergillosis is a long-term fungal infection caused by members of the genus Aspergillus—most commonly Aspergillus fumigatus. The term describes several disease presentations with considerable overlap, ranging from an aspergilloma—a clump of Aspergillus mold in the lungs—through to a subacute, invasive form known as chronic necrotizing pulmonary aspergillosis which affects people whose immune system is weakened. Many people affected by chronic pulmonary aspergillosis have an underlying lung disease, most commonly tuberculosis, allergic bronchopulmonary aspergillosis, asthma, or lung cancer. Classification
Chronic pulmonary aspergillosis as a term encompasses a number of different presentations of varying severity. There is considerable overlap between disease forms which adds to confusion during diagnosis. The primary differentiation comes from radiological findings and serology. Aspergilloma
An aspergilloma is a fungus ball composed of Aspergillus hypha - the long filamentous strands which extend from the fungus to enable growth and reproduction. They can arise within any bodily cavity, though in chronic pulmonary aspergillosis they form within pulmonary cavities that have been colonized by Aspergillus spp. If there is a single, stable cavity that provides minimal symptoms, the term simple aspergilloma is commonly used to distinguish it from more severe forms of chronic pulmonary aspergillosis. Aspergillus nodule
Aspergillus can form single or multiple nodules which may or may not form a cavity. Whilst usually benign in nature, they can sometimes cause symptoms such as cough or an exacerbation of existing disease such as asthma. Histologically, there is necrosis surrounded by granulomatous inflammation with some multinucleated giant cells present.
A ganglion is a group of neuron cell bodies in the peripheral nervous system. In the somatic nervous system this includes dorsal root ganglia and trigeminal ganglia among a few others. In the autonomic nervous system there are both sympathetic and parasympathetic ganglia which contain the cell bodies of postganglionic sympathetic and parasympathetic neurons respectively. A pseudoganglion looks like a ganglion, but only has nerve fibers and has no nerve cell bodies. Structure
Ganglia are primarily made up of somata and dendritic structures which are bundled or connected. Ganglia often interconnect with other ganglia to form a complex system of ganglia known as a plexus. Ganglia provide relay points and intermediary connections between different neurological structures in the body, such as the peripheral and central nervous systems. Among vertebrates there are three major groups of ganglia:

Dorsal root ganglia (also known as the spinal ganglia) contain the cell bodies of sensory (afferent) neurons. Cranial nerve ganglia contain the cell bodies of cranial nerve neurons. Autonomic ganglia contain the cell bodies of autonomic nerves.In the autonomic nervous system, fibers from the central nervous system to the ganglia are known as preganglionic fibers, while those from the ganglia to the effector organ are called postganglionic fibers. Basal ganglia
The term "ganglion" refers to the peripheral nervous system.However, in the brain (part of the central nervous system), the "basal ganglia" is a group of nuclei interconnected with the cerebral cortex, thalamus, and brainstem, associated with a variety of functions: motor control, cognition, emotions, and learning.