Table of Contents
Introduction
A ceruminous adenoma is identified as a glandular tumor of the ceruminous glands, representing fewer than one percent of malignancies found in the external ears. Tumors originating from the ceruminous glands in the external ear canal can pose a diagnostic challenge due to their diverse clinical and histological presentations. While cases of ceruminous adenoma have reported recurrence and residual tumor, there has been no known malignant transformation of this condition to date. Ceruminous tumors can affect individuals of any age, ranging from 12 to 85, with an average age at presentation typically between 52 and 54. Patients with ceruminous pleomorphic adenoma tend to be younger at first diagnosis (average age of 50.5 years), but there are too few cases for a robust statistical analysis. There is a notable difference in the age of onset between patients with benign ceruminous tumors (in their mid-50s) and those with ceruminous adenocarcinomas (in their mid-40s). There is no gender preference across the entire group, although there may be a slight bias towards men with ceruminous pleomorphic adenoma. This article covers the ceruminal gland neoplasm.
What Is Ceruminal Gland Neoplasm?
Ceruminous gland tumors are classified into benign and malignant neoplasms, with ceruminous adenoma being described as a benign tumor of the ceruminous glands. The external auditory canal (EAC) contains modified apocrine sweat glands, ceruminous glands, and sebaceous glands. The ceruminous glands are situated deeper than the sebaceous glands, within the dermis of the outer third of the external auditory canal.
Ceruminous adenoma (CA), or "ceruminoma," is a glandular neoplasm of the ceruminous glands. It is a rare tumor of the external auditory canal, constituting less than one percent of all external ear tumors, and typically affects adults and middle-aged individuals (52-55 years). A ceruminous adenoma is categorized as "a well-differentiated, benign tumor that is localized. Some authors strongly advocate retaining the term "ceruminoma" to encompass all tumors originating in the external auditory canal's ceruminous glands, while others strongly oppose using this broad term.
Both "ceruminoma" and "cylindroma" have been used to describe histologically benign and malignant neoplasms, complicating clinical decision-making and follow-up guidance for clinicians and surgeons. The typical external ear canal is a 2.5 cm long, S-shaped opening coated with a delicate squamous mucosa coating, a sparse fibrous stroma that contains both sebaceous and modified ceruminous sweat glands.
The ceruminous glands are located deep within the dermis, usually near the cartilage, found in the outer one-third to one-half of the canal. There are no glands in the inner, bony section of the canal. These glands consist of columnar cells with intensely eosinophilic cytoplasm, often exhibiting "apical caps," "secretory snouts," or "blebbing." A layer of myoepithelial cells surrounds these cells.
Unlike holocrine sebaceous glands, which lose the entire cell during secretion, ceruminous cells lose only part of their cytoplasm. Ceruminous glands are typical ceruminous sweat glands, producing a watery fluid without lipids. This fluid drains into ducts that open, along with sebaceous gland ducts, into the hair follicles of the fine hairs in the ear canal.
The fluid mixes with the secretion of the sebaceous glands to form cerumen (earwax). The cytoplasm of the luminal secretory cells is water-insoluble and golden yellow-brown. Lipoprotein pigment granules are similar to ceruminous glands elsewhere, though these pigment granules do not become part of the secretion.
What Causes Ceruminal Gland Neoplasm?
These tumors are rare, but "ceruminous pleomorphic adenoma" is recommended to specify the anatomical location (external auditory canal) and the histological classification. Although well-documented in cats and dogs, such tumors are rare in humans and are infrequently encountered by general surgical pathologists. These terms typically do not indicate a specific diagnosis, clinical behavior, treatment options, or long-term prognosis. Similarly, many reports in the literature, upon critical review, are examples of neuroendocrine adenoma of the middle ear (middle ear adenoma), endolymphatic sac tumors (Heffner tumor), paraganglioma, or likely represent parotid gland neoplasms that have extended into the external auditory canal. While syringocystadenoma papilliferum is occasionally mentioned in this location, including "ceruminous" helps in accurate classification. Various factors, from noisy environments to pathological conditions, can cause significant functional disturbances. However, no specific causal agent has been identified for ceruminous adenomas. This neoplasm is exceedingly rare, with limited reported cases in the literature despite challenges in naming conventions.
What Are the Symptoms Of Ceruminal Gland Neoplasm?
Ceruminous adenomas typically cause a few nonspecific symptoms, which correspond to the mass's size and the level of canal obstruction.
The following are the symptoms of ceruminal gland neoplasm:
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Nerve changes (such as paralysis).
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Discharge from the ear.
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Mild to moderate earache
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Rarely, bleeding occurs.
Pain can be a useful clinical indicator, prompting suspicion of a malignant tumor, especially when there are challenges in histological classification. However, pain can occur in both benign and malignant ceruminous tumors. Many cases are asymptomatic and are only found by chance when examinations for other reasons. The interval between the onset of symptoms and seeking medical attention can range up to 40 years, though most patients experience symptoms over several years.
How Is Ceruminal Gland Neoplasm Diagnosed?
The histopathological features of cells confirm ceruminal gland neoplasm.
The following are the histopathological features of ceruminal gland neoplasm:
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The cell secretes yellow-brown granules, confirming the ceruminous nature of the neoplasm.
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Exocrine sweat glands are absent in the external auditory canal. The exact origin of ceruminous adenomas is complex and not fully understood, but possible progenitors include embryonal anlage, ectopic remnants of salivary glands, and the ceruminous glands themselves.
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Sometimes cystic, and histologically, it shows papillary proliferation of glands similar to normal ceruminous glands.
What Is the Treatment for Ceruminal Gland Neoplasm?
The studies show that all patients underwent partial or complete surgical excision of their tumors. Complete removal was often not possible due to the temporal bones and the ear's intricate architecture. None of the patients had adjuvant chemotherapy or radiation therapy. Follow-up data were obtained for 40 patients, with one foreign patient lost to follow-up. Among these 40 patients, none showed evidence of disease at the last follow-up (average of 14.9 years).
Twenty-eight patients were alive without disease (average follow-up of 16.3 years), and 12 had died of unrelated causes without disease (average of 11.8 years). Four patients experienced a recurrence. Of these, two had wider excisions performed at 2 and 6 months, respectively, which might indicate residual rather than recurrent disease due to anatomical constraints and the nature of the referral institution.
The other two patients had local recurrences at the same site between 2 and 4 years after the initial presentation. Both are disease-free following surgical excision at their last follow-up. Overall, patient outcomes or follow-up duration were the same for those who had recurrences and those who did not. Additionally, outcomes did not differ between men and women or among different histological types.
Conclusion
Ceruminal neoplasm is a generalized term for tumors of the external ear. It occurs rarely, and its etiology is not yet known. The patient with ceruminal neoplasm can suffer from earache, bleeding, headache, discharge of the ear, and hearing loss. Histopathological features of histopathological diagnosis. The proper treatment, including excision, is the treatment of choice.
