A markedly non-compliant middle ear system with an abnormally large external ear canal volume is demonstrated as a Type __________ tympanogram.

A tympanogram is a graph that represents the function of the middle ear. It typically measures the compliance of the tympanic membrane (eardrum) in response to changes in air pressure in the ear canal. When discussing the characteristics of various tympanogram types, a markedly non-compliant middle ear system with an abnormally large external ear canal volume suggests specific pathological conditions in the ear.

In this case, the presence of an abnormal external ear canal volume indicates either that the tympanic membrane is not engaging properly due to significant issues, which could include a perforation or absence of the tympanic membrane altogether. This situation means that the standard classifications of Type A, B, and C tympanograms do not adequately describe the measured parameters, particularly since a Type B tympanogram typically features low or no compliance due to fluid in the middle ear, while a Type A would show normal compliance.

By stating that it is reported as "abnormally large external ear canal volume," it recognizes that while we can observe these abnormal conditions, they don't fit neatly into the standard classifications used for tympanometry which rely on specific identifiable patterns. Therefore, indicating that no type is indicated reflects an understanding of the limitations of tympanometry in capturing this particular scenario