During a routine office visit for mild acute nasal congestion and possible diminished hearing, an isolated, small, pearl-like mass was noted just posterior to the umbo of the left tympanic membrane of a 5-year-old girl.
During a routine office visit for mild acute nasal congestion and possible diminished hearing, an isolated, small, pearl-like mass was noted just posterior to the umbo of the left tympanic membrane (TM) of a 5-year-old girl (Figure). She was otherwise well. There was no history of traumatic perforation of the tympanic membrane or otorrhea.
At a follow-up visit 2 months later, the same lesion was still visible. An office screening audiogram was performed and the child easily passed without any deficits at the 20 dB screening threshold.
The girl had had tympanostomy tubes inserted 3 years ago because of 4 episodes of acute otitis media in the previous 12-month period. The tympanostomy tubes had remained in place for about 18 months, and then extruded spontaneously.
The most common white lesion on the TMs of young children is a calcified tympanosclerotic plaque (Table 1). Recall that the child had had tympanostomy tubes inserted several years prior and that the tubes had remained in place for more than 1 year.
The most common misdiagnosis of an intratympanic cholesteatoma is tympanosclerosis. Additional diagnostic considerations include desquamation of all or part of the tympanic membrane. This can occur during the recovery phase of acute otitis media caused by the more virulent Streptococcus pyogenes or Streptococcus pneumoniae. The pearl-like lesion also could possibly be a real foreign body such as a toy pearl, bead, or Styrofoam pellet that was stuck on the center of the TM.
Examination of the left tympanic membrane with otomicroscopic magnification at the otolaryngologist’s office revealed a glistening, tiny, 3-dimensional round cystic lesion pointing toward the ear canal. It was clearly separated from the middle fibrous layer of the TM, thus ruling out a tympanosclerosis scar.
The patient was referred to a pediatric otolaryngologist who made a definitive diagnosis of intratympanic pearl-like cholesteatoma.
The characteristic location of a congenital middle-ear space cholesteatoma (mesotympanic cholesteatoma) is in the anterior or posterior superior quadrant where it is seen under otoscopic magnification appearing as a white or golden-colored round mass. Primary congenital intratympanic cholesteatomas, characterized by accumulation of keratinous debris in the space between the outer epithelial layer and the middle fibrous layer of the TM, are said to be very rare. However, there are more than 50 cases previously reported in the medical literature (Table 2).1-9
In most cases including this case, an intratympanic cholesteatoma appears as if a tiny lustrous pearl is affixed to the lateral layer of the tympanic membrane. The senior author of this article has detected 5 additional intratympanic cholesteatomas in his 43 years in primary care pediatric practice.4,10 The characteristic location of an intratympanic cholesteatoma is in the center of the tympanic membrane, adjacent to the umbo. In contradistinction, tympanosclerotic scars have an incomplete arc-like peripheral location often starting at 1 o'clock on the TM and ending in a 9 o'clock location.
There are several possible outcomes of an unrecognized intratympanic cholesteatoma. The cyst may rupture spontaneously. The squamous epithelial cyst wall then shrivels up and is cast into the ear canal.11 A second path of evolution occurs when the lesion enlarges. An unknown percentage of these isolated cholesteatomas can invade the middle ear cleft.12-14 In 1 of the authors’ 4 other cases of this unusual intratympanic cholesteatoma, the tiny cyst was believed to be totally excised by an experienced pediatric otolaryngologist. Six months postoperatively, a planned "look see" intraoperative reexamination of the tympanic membrane and middle-ear space revealed an unexpected mesotympanic (middle-ear space) growth of squamous debris from the invasive intratympanic cholesteatoma. Even though apparent complete excision of the entire intratympanic cyst is performed at the time of initial surgery, serial reexaminations at 6- to 12-month intervals is strongly recommended.
Undetected and left alone, the cyst may enlarge and even migrate laterally, into the ear canal, or medially, invading the middle and medial layer to the TM and implanting itself and growing in the middle ear cleft where it can damage the middle ear ossicles and even invade the epitympanic space, gradually expanding and causing damage to the middle ear ossicular chain. A computed tomography scan of the middle ear was not performed for this patient, although CT is frequently ordered to help evaluate the middle ear cleft for mesotympanic extension of a cholesteatoma.
The patient underwent surgical removal of the intact cyst, and histopathology was confirmed as a cholesteatoma. Follow-up evaluation was scheduled with pediatric otolaryngology 6 months later.
lntratympanic cholesteatomas are rare, with 50 reported in the medical literature. There are very few reports of these invasive cysts in the general pediatric literature. They appear as totally innocent-looking, tiny, pearl-like lesions located adjacent to the umbo of the tympanic membrane. Undetected and left alone, some of them enlarge and migrate into the middle-ear cleft, gradually expanding and causing damage to the middle-ear ossicular chain. If still present after a few months of observation, prompt referral to an otolaryngologist is highly recommended.
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Dr Schwartz is professor of Pediatrics, Virginia Commonwealth University School of Medicine, Inova Children’s Hospital Campus, Falls Church, Virginia. Dr Bahadori is a pediatric otolaryngologist in private practice at Otolaryngology Associates, Fairfax, Virginia. The authors have nothing to disclose in regard to affiliations with or financial interests in any organizations that may have an interest in any part of this article.