Masticator space tumor, malignant schwannoma.The masticator space is a facial compartment that contains the muscles of mastication muscles of mastication pl.n. The masseter, temporal, lateral pterygoid, and medial pterygoid muscles considered as a group. , the mandibular ramus, and various neurovascular structures. Primary neoplasms of the masticator space are uncommon. When they do occur, they can be either benign or malignant, such as vasculogenic tumors, lipomas, neurogenic neurogenic /neu·ro·gen·ic/ (-jen´ik) 1. forming nervous tissue. 2. originating in the nervous system or from a lesion in the nervous system. tumors (e.g., schwannomas), sarcomas, lymphomas, and metastatic lesions. Direct extension of tumors involving the structures adjacent to the masticator space is a common form of neoplastic involvement. Common extensions include squamous cell carcinomas, salivary neoplasms, diffuse lymphomas, and adenocarcinomas. [1] A 47-year-old man came to the office complaining of chronic temporomandibular joint pain Temporomandibular joint pain (TMJ) Pain and other symptoms affecting the head, jaw, and face that are caused when the jaw joints and muscles controlling them don't work together correctly. Mentioned in: Electrical Nerve Stimulation on the left, which was associated with a left-sided trismus trismus /tris·mus/ (triz´mus) motor disturbance of the trigeminal nerve, especially spasm of the masticatory muscles, with difficulty in opening the mouth (lockjaw); a characteristic early symptom of tetanus. and a decreased range of mandibular movement. On physical examination, there was soft tissue swelling on the left side of the face and temporal region. In this case, magnetic resonance imaging magnetic resonance imaging (MRI), noninvasive diagnostic technique that uses nuclear magnetic resonance to produce cross-sectional images of organs and other internal body structures. (MRI) was the best method of assessing the soft tissue mass. MRI revealed a large nonhomogenous soft tissue mass in the left masticator space (figure). Histologic examination of the surgically resected mass revealed a malignant schwannoma. From the Department of Radiology, Louisiana State University Health Science Center, New Orleans (Dr. Palacios), and the Department of Radiology and Otolaryngology, University of Illinois Medical Center, Chicago (Dr. Valvassori). Reference (1.) DelBalso AM, Herz P, Miller L, et al. Ki-l-positive anaplastic large cell lymphoma Anaplastic large cell lymphoma (ALCL) is a type of non-Hodgkin lymphoma that features in the World Health Organisation (WHO) classification of lymphomas. Diagnosis To make this diagnosis under its present system of classification, the WHO: Requires |
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