Tumours of the salivary glands are rare and highly varied, dominated in frequency by parotid tumours (70% - 80%), which develop at the expense of the constituent elements of the parotid gland, and are benign or malignant lesions. They may be primary or secondary [1] . They account for 3% to 4% of all tumors in the body, and 6% of those in the head and neck [2] . Benign tumours, in particular pleomorphic adenomas, are the most common in the parotid gland, accounting for between 40% and 80% of all cases [3] . Although the majority of these tumours are curable, malignancy can never be ruled out, even in association with other rare pathologies [4] .

These salivary gland tumors are characterized by great morpho-histological heterogeneity [5] .

However, parotid tumors are of great interest due to their variety of clinical presentation, histological and evolutionary characteristics. The most frequent mode of revelation is swelling of the parotid lodge [6] .

Over the years, a number of studies on parotid tumor pathology have been published. In terms of surgical management, since the time of VIRCHOW in 1863, there has been a clear evolution in practices. In Senegal, several studies have been carried out on this subject [5] [7] .

In a study carried out in the odontostomatology department of Niamey National Hospital, the hospital prevalence was estimated at 0.11 consultations, with an average incidence of around 5 cases per year [8] .

The real challenge of parotidectomy lies in the risk of facial nerve damage, which can result in significant aesthetic damage [6] .

The aim of the present study was to improve the management of parotid tumors, and to describe the indications and results of parotidectomies in the ENT department of the Idrissa Pouye General Hospital in Dakar. The aim was to add value to our scientific research.

This was a retrospective study; conducted in the Department of Otolaryngology and Anatomic Pathology at Hôpital Idrissa Pouye in Grand Yoff between January 01, 2004 and December 31, 2012. Thirty-one files were examined and retained for our study. All records of patients who underwent parotidectomy in these 2 departments during the study period constituted our study population. We included in this study all patients who had been consulted for a parotid tumor with or without histological evidence. Data collection was based on patient observation records. Survey forms (see Appendix) were drawn up from these files to collect epidemiological, diagnostic, therapeutic and evolutionary data for each patient. We used Word, Microsoft Excel 2010 and SPSS version 16.0 to enter the data and design the tables and figures. Data concerning the identity of patients were treated with respect for anonymity and confidentiality.

During our study period, we collected 31 records of patients who had been consulted for a parotid tumor with or without histological evidence. The average age was 47.45 years, with extremes of 16 and 74 years. The 40 - 50 age group was the most represented, with 9 patients or 29.03% of cases. The age ranges are shown in Figure 1.

Female predominance was clear, with 17 cases (54.8%) and a sex ratio of 0.82. The mean time to consultation in our series was 5 years, with extremes of 2 and 15 years. The most frequent circumstance of discovery was a swelling of the parotid region, accounting for 100% of our patients. Peripheral facial paralysis was present in 3 of our patients (9.67%). Pain was present in one patient (3.25%). Palpable adenopathy was noted in one patient (3.25%).

Ultrasound of the parotid region was not performed in any patient. CT scanning was performed in one patient (3.25%). The histological results of the surgical specimens in 25 of our patients (80.64%) revealed 18 cases of benign tumours (72%), and 7 cases of malignant tumours (28%). Table 1 shows the distribution of histological types.

The indication for surgery was based on the circumstances of discovery and the clinical examination. All our patients had undergone surgery, and the majority (54.84%) underwent exofacial parotidectomy. Table 2 summarizes all the procedures performed.

Adjuvant radiotherapy was performed in 12.9% of our patients, and chemotherapy in one of our patients with a MALT-type lymphoma.

We noted 2 cases of death (6.45%), 8 lost to follow-up (25.80%) and 21 (67.74%) alive and well, with no locoregional or tumor-distant events.

Salivary gland tumours account for only 0.2% to 0.6% of all tumours in general [9] . The parotid gland is the largest and most frequently affected, accounting for 90% of tumours of the main salivary glands. Some 70% - 80% of salivary gland tumours are located in the parotid glands, of which 80% are benign [10] [11] .

Pleomorphic adenoma (PA) is a frequent benign tumor of the salivary glands [9] . Parotid tumours can occur at any age [6] . In our series, the mean age was 45.42 years, with extremes of 16 and 74 years. These tumours remain rare in children [6] . In the literature, the peak incidence for parotid tumors is in the 5th, 6th and 7th decades [6] . This is in line with those found by Akkari et al. [9] , with a mean age of 45 years, and Konan et al. [12] , with extremes of 8 and 75 years.

Gender distribution varies in the literature. In most series [13] [14] , there is a female predominance similar to that of our study.

In our practice, the time taken for clinical symptoms to develop was long, averaging 5 years. This was identical to that reported by Konan [12] , which ranged from 1 to 5 years in 2010, while Beltaief et al. [15] in 2007 reported an average consultation time of 26 months, with extremes ranging from 1 month to 10 years.

Swelling of the parotid region was the most frequent reason for consultation in all patients (100%) in our series, associated in rare cases with peripheral facial paralysis in 3 patients (9.67%). Several series have also shown that swelling of the parotid region was the main symptom [16] [17] [18] . Clinical examination provides evidence of benignity (firm, mobile, painless) or malignancy (fixed, painful, adenopathies) [19] .

Imaging continues to play an important role in the diagnosis of parotid tumors. Ultrasound is a simple, non-invasive examination. It enables diagnosis in almost 100% of cases [19] . Ultrasound remains limited in the exploration of the deep lobe and large tumors, where it is difficult to appreciate the boundaries [19] . In our series, no patient underwent ultrasonography, unlike in the series by Konan [12] , where 65.79% of patients benefited from ultrasonography. This is clearly inferior to the study by Akkari et al. [9] , who showed that all their patients (100%) benefited from an ultrasound scan. Computed tomography (CT) perfectly visualizes the parotid gland with its two superficial and deep lobes, and pinpoints the topography of lesions and their locoregional extension. It attests to the aggressiveness of certain malignant tumors and their invasion of neighboring tissues [7] [20] .

One of our patients had to undergo a CT scan, in order to better characterize the tumor and clarify its limits. This is significantly lower than the rate reported in the literature [9] [15] .

Magnetic resonance imaging (MRI) is a highly effective means of diagnosing parotid tumours, but is not often used in our practice. Fine-needle aspiration is still a controversial procedure in the management of parotid tumours.

Its sensitivity and specificity were 81.8% and 97.5% respectively in the series by Longuet et al. [21] . The low rate of performance of these different examinations could be explained by the lack of financial means of the majority of our patients.

The inclusion criterion in our study was the availability or absence of histological evidence. In our series, histological findings concerned anatomopathological examinations of surgical specimens, i.e. 80.64% of patients having undergone a histological examination. Benign tumors predominated, with 18 cases (72%), led by pleomorphic adenomas in 9 cases (36%). Malignant tumors accounted for 7 cases, with carcinoma the most frequent histological type (6 cases), followed by MALT-type lymphoma (4%). These data are comparable to those in the literature [9] [22] .

In well-equipped countries, extemporaneous anatomopathological examination is an integral part of the surgical procedure. It enables surgical treatment to be modulated intraoperatively. It is still lacking in the tropics. However, this examination has its limitations, with 75% sensitivity and 100% specificity in the series by Longuet et al. [21] .

In terms of treatment, there was unanimous agreement that parotidectomy is essential for all parotid tumours, for both diagnostic and therapeutic purposes. Exofacial parotidectomy was the most frequently performed surgical procedure, with 17 patients (54.84%). This high percentage can be explained by poor record keeping. This was followed by conservative total parotidectomy in 8 cases (25.80%). In the absence of extemporaneous examination, we tend more towards total parotidectomy, which remains a maximalist attitude. This attitude has also been reported by other authors [2] .

The indication for complementary radiotherapy in malignant parotid tumours is no longer debated.

In the treatment of parotid cancers, all studies confirm the improvement in prognosis when surgery and radiotherapy are combined, rather than surgery alone or radiotherapy alone [16] .

Chemotherapy has been used for lymphoma and sarcoma in various series [23] [24] . In our series, one patient underwent adjuvant chemotherapy for lymphoma.

For cancers, the overall survival rate found in the literature is between 71% and 82% at 3 years and between 61% and 72% at 5 years, but long-term follow-up (10 to 20 years) is still necessary to detect late recurrences, especially for certain histological types with slow tumor growth [15] .

Relatively rare parotid tumors are characterized by their great diversity. They pose a number of diagnostic, therapeutic and evolutionary problems. In principle, these tumors are amenable to surgical treatment, with or without radiotherapy for malignant lesions. The management of parotid tumors at HOGIP could be improved by informing and educating patients to seek early consultation, and by upgrading the technical facilities.

The authors declare no conflicts of interest regarding the publication of this paper.

Diallo, O.A., Faty, A., Tall, H., Synayoko, A., Diallo, A.O., Ndiaye, M. and Diallo, B.K. (2023) Indications and Results of Parotidectomies in the Orl Department of the Idrissa Pouye General Hospital in Dakar. Concerning 31 Cases. International Journal of Otolaryngology and Head & Neck Surgery, 12, 375-384. https://doi.org/10.4236/ijohns.2023.126040

Survey Sheet on Indications and Results of Parotidectomies in the Orl Department of Grand Yoff General Hospital

Inquiry form No. _________ File No. _________

1) CIVIL STATUS

Last name: ___________ First names: ___________

Age: ______ Sex: ______

Address: ___________ Tel: ___________

Profession: ______________ Nationality _____________

Entry date_______________ Exit date ____________

2) DISCOVERY CIRCUMSTANCES

Tumor □ Peripheral facial paralysis □

Pain □ Adenopathies □

Consultation time ______________________________

3) SURVEY

• ANTECEDENTS

➢ PERSONAL

· MEDICAL __________________________________

· SURGICAL ______________________________

· GYNECO-OBSTETRICS _______________________

➢ FAMILY: Diabetes □ HTA □ Cancer □

History of surgery □ Other □

• LIFESTYLE

Socio-economic level: Low □ Medium □ High □

4) CLINICAL EXAMINATION

• GENERAL REVIEW:

General condition: Good □ Bad □

Conscience: Clear □ Altered □

Mucous membranes: Colored □ Pale □

Lower limb edema: Absent □ Present □

Dehydration fold: Absent □ Moderate □ Present □

Undernutrition fold: Absent □ Moderate □ Present □

Constances: T = TA = FC = FR

Weight = Height = BMI=

• ENT EXAMINATION

Skin _______________________________________________________

Mucous membranes:

· Anterior rhinoscopy: ___________________________________

· Oral cavity: __________________________________________

· Oropharynx: ____________________________________________

· Otoscopy: ______________________________________________

· Indirect laryngoscopy: ___________________________________

· Glands:

➢ Salivary glands

- The left parotid gland: _____________________________________

- Right parotid gland: ______________________________________

- Submaxillary glands: ______________________________

- Sublingual glands: _________________________________

➢ Thyroid gland: ________________________________

· Ganglion areas: __________________________________

· Cranial nerves: _______________________________________

• OTHER EQUIPMENT AND SYSTEMS: ____________________________

5) PARACLINICAL EXAMINATIONS

• IMAGING

Ultrasound of the parotid glands: _____________________________

CT scan of parotid glands: ___________________________________

MRI of the parotid glands: _________________________________

Chest X-ray: ___________________________________________________

• Anatomo-cyto-pathology:

➢ Cytopunction: Yes □ No □

➢ Surgical specimen: Yes □ No □

➢ Results: Benign □ Malignant □

Specify histological type __________________________________

6) CLASSIFICATION: T_______ N_______ M_______

Stage: ________________

7) TREATMENT

• Surgery: parotidectomy

Partial □ Total □

Conservative □ Non-conservative □

• Chemotherapy _________________________________________________

• Radiotherapy ___________________________________________________

8) EVOLUTION:

➢ Alive

➢ Lost from sight

➢ Deceased