Mitsuo Sato

All Publications

• Three Cases of Hematoma in the Retropharyngeal Space. Ear, nose, & throat journal Sato, M. P., Otsuki, N., Koike, S., Yasumatsu, R. 2022: 1455613221141231

  Abstract

  OBJECTIVES: Hematoma in the retropharyngeal space (RPS) is a life-threatening condition that leads to rapid airway obstruction. However, the indication for airway management remains unclear. Additionally, the requirement for surgical hematoma evacuation remains undetermined. Therefore, we attempt to suggest some criteria for the management of hematoma in such cases.METHODS: We report three cases of hematoma in the RPS wherein one patient was treated without surgery and the other two underwent tracheotomy followed by hematoma evacuation.RESULTS: We found that airway management should be based on whether the glottis could be visible on laryngoscopy and dyspnea severity. The degree of hematoma, swelling, subcutaneous bleeding in the anterior neck, and emotional stability should also be considered. Proper management during the acute phase may allow for conservative treatments. Hematomas extending below the tracheal bifurcation may help ease upper airway obstruction due to pressure distribution, allowing for conservative treatment. When hematomas are surgically evacuated, tracheotomy should be performed simultaneously. Our report suggests that mediastinal hematoma evacuation could be avoided.CONCLUSION: We should determine a therapeutic strategy for hematoma in RPS based on glottis visualization, patient's condition, and extent of hematoma growth under careful observation.

  View details for DOI 10.1177/01455613221141231

  View details for PubMedID 36416101

• Predictive factors for malignant neoplasms veiled in deep neck infections ACTA OTO-LARYNGOLOGICA Sato, M. P., Otsuki, N., Kimura, T., Doi, K. 2022; 142 (2): 202-205

  Abstract

  Background: Malignant neoplasms (MNs) in the head and neck are occasionally hidden in deep neck infections (DNIs) that require emergency treatment, which potentially leads to delayed diagnosis of MNs.Objectives: This study aimed to identify predictive factors that can prevent delays in diagnosing MNs in patients with DNIs.Methods: We retrospectively analysed data from 83 patients admitted to our hospital who were diagnosed with DNIs.Results: Four patients (4.8%) had DNIs veiling MNs in the head and neck. Statistical analyses revealed a significant association (p = .0481) of platelet to albumin ratio (PAR; ≥ 98.9 × 103) with hidden MNs in DNIs. Furthermore, concomitant cervical lymphadenopathy, especially multiple lymphadenopathies and excluding abscesses, was higher in patients with DNIs veiling MNs (p = .0142 and p = .0023, respectively).Conclusions and Significance: The PAR, which can be easily measured and readily detected, was a potential predictive factor. Moreover, performing fine-needle aspiration for lymphadenopathies could help diagnose hidden MNs in DNIs.

  View details for DOI 10.1080/00016489.2022.2030880

  View details for Web of Science ID 000750764500001

  View details for PubMedID 35112650

• Middle-ear carcinoid tumour metastasising to the parapharyngeal space and the parotid gland JOURNAL OF LARYNGOLOGY AND OTOLOGY Sato, M. P., Otsuki, N., Iwamoto, S., Doi, K. 2022: 1-5

  Abstract

  Background. Middle-ear carcinoid tumour is a rare malignant tumour with an indolent course occasionally causing regional or distant metastasis. This paper presents a case of middle-ear carcinoid tumour metastasising to the parapharyngeal space and the parotid gland 20 years after the first surgery.Case report. A 35-year-old woman who underwent multiple tympanomastoidectomies for middle-ear carcinoid presented with tumours of both the parapharyngeal space and parotid gland, detected by regular imaging. Based on the clinical course, metastatic relapse of middle-ear carcinoid was suspected. This was treated with subtotal parotidectomy with elective neck dissection (levels II and III), leading to the pathological diagnosis of carcinoid tumour. A cervico-parotid approach was selected to avoid complications associated with parapharyngeal space tumour removal. Transient facial palsy (House-Brackmann grade III) occurred, which completely recovered two months after surgery.Conclusion. Awareness of parapharyngeal space tumours possibly caused by metastasis from a middle-ear tumour is necessary.

  View details for DOI 10.1017/S0022215122000287

  View details for Web of Science ID 000868924300001

  View details for PubMedID 35094719

• A novel parotid carcinoma with a prominent ghost cell population: a masquerading tumor or "salivary ghost cell carcinoma"? MEDICAL MOLECULAR MORPHOLOGY Harada, H., Sato, M. P., Otsuki, N., Kawamura, M., Kurose, A., Satou, T. 2022; 55 (1): 76-83

  Abstract

  Ghost cell is one of several unique cellular morphologies associated with aberrant keratinization. We encountered a novel parotid tumor containing numerous ghost cells and herein describe its histological features and discuss diagnostic problems. The patient was a 90-year-old Japanese male, who complained of swelling of the left parotid area for four months. Positron emission tomography indicated no cervical lymph node metastasis or distant metastasis. The tumor was successfully resected with no signs of recurrence or metastasis for six months after surgery. Histologically, the tumor was mainly composed of squamous cells forming irregularly shaped nests with a mixture of pleomorphic giant or multinucleated cells and bland basaloid cell. Keratinized areas were occupied by a prominent ghost cell population. Immunohistochemically, CK5/6 and CK19 were widely positive as well as AE1/AE3, p40 and p63. Nuclear expression of β-catenin was also observed. The present case can be regarded as a particular form of squamous cell carcinoma and is believed to contain a large number of ghost cells resulting from an unclear mechanism. However, it seems difficult to consider such tumors as a clinicopathologically independent entity at present. Applying a term such as "salivary ghost cell carcinoma" would be premature.

  View details for DOI 10.1007/s00795-021-00302-9

  View details for Web of Science ID 000684899200001

  View details for PubMedID 34392428