A case of an inflammatory pseudotumor restricted to the tympanic space

KAKAZU Yasuhiro, NAKAGAWA Takashi, SHIBATA Shumei, SHIRATSUCHI Hideki, URYU Hideoki, KOMUNE Shizuo

doi:10.11334/jibi1954.51.5_330

An extremely rare case of an inflammatory pseudotumor (IPT) in the middle ear is herein reported. A twenty-seven-year-old male was introduced to our department to be examined for a red mass that had been observed to exist near his left eardrum. Temporal bone CT revealed a soft tissue density which filled the tympanic sinus. MRI suggested it to be a neoplasm. To establish a histopathological diagnosis, surgery was performed. First, a biopsy was done during the operation and a strong permeation of inflammatory cells was merely observed with no evidence of a neoplasm. A posterior tympanotomy and the removal of the incus were then carried out to obtain a sufficient view, and then the tumor-like lesion was removed completely without damaging either the facial nerve or the oval window. The external specimen was diagnosed to be inflammatory granulation in which a dense part of the specimen consisted of fibroblasts and myofibroblasts. Based on the clinical and histopahological findings, IPT was finally diagnosed. IPTs have been reported to occur at numerous sites such as the lung, which is the most common site, as well as the liver, spleen, mediastina, and the rear peritoneum. In the head and neck area, IPTs tend to occur in eye sockets, the paranasal sinus, the large salivary gland and the thyroid. However, the occurrence of IPT in the temporal bone region is extremery unusual.

A case of an inflammatory pseudotumor restricted to the tympanic space

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