Case Report | Open Access
Elio Bittar Barbosa, Evaldo César Macau Furtado Ferreira, Fernanda Viviane Mariano, Albina Messias de Almeida Milani Altemani, Emerson Taro Inoue Sakuma, Eulalia Sakano, "Metastasis to Paranasal Sinuses from Carcinoma of Prostate: Report of a Case and Review of the Literature", Case Reports in Otolaryngology, vol. 2018, Article ID 5428975, 5 pages, 2018. https://doi.org/10.1155/2018/5428975
Metastasis to Paranasal Sinuses from Carcinoma of Prostate: Report of a Case and Review of the Literature
Metastasis from distant primary tumors is extremely rare in the paranasal sinuses with few hundred cases in the literature. Metastatic carcinoma of the prostate is even rarer, despite being one of the most common tumors, with only 24 cases published. In this article, we report a case of a 58-year-old male presenting with epistaxis and nasal obstruction as initial symptoms of a metastatic prostate carcinoma in the ethmoid cells and maxillary sinus.
Paranasal sinus cancer represents a small portion of the head and neck cancer, approximately 5% of all head and neck tumors . These tumors may arise from multiple tissues present in the nose and paranasal sinuses  or more rarely be a metastasis from a distant primary cancer.
Prostate adenocarcinoma is the most prevalent malignant cancer in the male population. In Europe, the incidence rate is 214 cases per 1000 men . Metastases from prostate tumors are a major determinant of survival rates, and prostate-specific antigen tests decrease the incidence of metastatic disease at diagnosis .
In this article, we presented the rare case of a patient with a distant metastasis in the right ethmoid cells from a prostate adenocarcinoma.
2. Case Report
A 58-year-old male patient was referred to the Otolaryngology Emergency Service because of important unilateral epistaxis, the third episode in the previous month. He also presented with ipsilateral nasal obstruction and diplopia with a three-month evolution. In his medical report, there was a record of penile squamous cell carcinoma treated with surgery and radiotherapy in 2014 and stage IV prostate adenocarcinoma (iliac, lumbar, and encephalic metastasis) refractory to hormone therapy and chemotherapy, submitted to palliative radiotherapy one month earlier.
During endoscopy, a polypoid, papilloma-like mass originated from the middle meatus was visible, occupying the entire right nasal fossa. No other abnormality was seen in the left nasal fossa. The epistaxis was controlled; the patient was stabilized and referred to biopsy.
The computed tomography (CT) and magnetic resonance imaging (MRI) showed soft tissue density lesion in the right nasal fossa, ethmoid cells, and maxillary sinus with extension into the inferior portion of the orbit through the lamina papyracea and posteriorly to the pterygomaxillary fissure (Figures 1 and 2).
The biopsy resulted in adenocarcinoma (Figures 3(a) and 3(b)). Since the patient had a medical report of prostate adenocarcinoma, the sample was submitted to an immunohistochemical panel. The prostate-specific antigen (PSA) was highly positive, and the diagnosis was confirmed as metastatic prostate adenocarcinoma (Figures 4(a) and 4(b)).
Because of the clinical status of the patient, a few symptoms presented, and the fact that he was already submitted to radiotherapy at the same field, it was opted for a clinical follow-up. After two months of the diagnosis, the patient deceased.
Paranasal sinuses are a complex anatomic area, surrounding important structures such as the orbit and skull base. The most incident tumors are the squamous cell carcinoma, followed by adenocarcinoma and adenoid cystic carcinoma .
In a review, Prescher and Brors reported 169 cases of metastatic tumor to the paranasal sinuses . Most cases originated from the kidney, followed by the lung, breast, thyroid, and prostate. Prescher and Brors also reported that the maxillary sinus was the most affected, followed by the sphenoid, ethmoid, and frontal sinuses . These data are similar to those published by Bernstein . In 77% of the cases, just one paranasal sinus was affected .
The nonspecific symptoms are similar to those of primary tumors. The nasal symptoms are usually nasal mass, nasal obstruction, facial deformity, and epistaxis. Orbital symptoms may also occur, such as proptosis, ptosis, decreased vision, and diplopia. Occasionally, these symptoms may be the first presentation of an occult primary tumor [8, 9].
The most frequent sites involved in prostate metastasis are the bone (90%), lung (46%), and liver (25%) . The head and neck are rare locations for metastasis, and it occurs more frequently in the brain, dura, and lymph nodes . The treatment may be hormone therapy, chemotherapy, radioisotopes, and radiotherapy .
Metastasis may reach the paranasal sinuses by hematogenous, lymphogenous, or vertebral venous plexus pathways. First postulated by Batson , this low-pressure valveless system is a connection between deep pelvic veins, intercostal veins, vena cava, and the azygos system. A rise in the abdominal pressure might redirect the blood flux from the vena cava system to the vertebral venous plexus. This flux alteration can allow the tumor to reach the paranasal sinuses .
This is the twenty-fifth reported case of metastatic prostate adenocarcinoma in the paranasal sinuses. The majority of cases involved patients with known prostate cancer, with a mean age of 63.15 years, and the most affected sinus was the sphenoid (44.5%). Radiotherapy was the preferred treatment option (40.7%). In Table 1, we describe the cases reported in full text, available online so far.
Imaging is not able to differentiate a local tumor from a metastasis; however, it is essential to determine location and extension and for surgical planning. CT may show enhancement, bone erosion, remodeling, and invasion. Magnetic resonance imaging (MRI) has an important role to help, defining leptomeningeal and orbital invasion . Positron emission tomography (PET-CT) might be useful in the primary occult tumor.
Histopathology has an essential role in the diagnosis. When metastasizing to the paranasal sinuses, normally prostate carcinoma is not well differentiated. Immunohistochemical panel is also important, with positivity of prostate-specific antigen, prostate acid phosphatase, EpCam, NKX3.1, and prostein .
Usually, the diagnosis of a metastasis to the paranasal sinuses means a poor prognosis. An important factor that can be crucial is whether the metastasis is isolated or part of a widespread disease.
Normally, the treatment involving the metastasis to the paranasal sinuses is palliative, with the exception of an isolated metastasis, for which the radical surgery may be a viable option. The patient’s quality of life should be a priority. The main goal is pain relief and bleeding prevention. Management has not changed greatly over the years, and therapy options include radiotherapy, chemotherapy, immunotherapy, and, more recently, endoscopic surgery .
Endoscopic surgery may provide symptom relief faster, with lower systemic and local side effects . Tabaee et al. suggested three criteria to help in the decision of the surgery: reasonable expectation of improvement, possible prolongation of life, and survivability after anesthesia .
Despite being a rare entity, metastatic prostatic tumor in the paranasal sinuses should always be part of the differential diagnosis in patients with known prostatic tumor and recently developed nasal or orbital symptoms.
Conflicts of Interest
The authors declare that they have no conflicts of interest.
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