[Misdiagnosis analysis: Schwannoma of the facial nerve trunk in parotid gland].

A 64 years old woman with chief complain of a lump without pain in her left face for 9 days. She was admitted to head and neck department for tumor of parotoid gland. There was not significan facial paralysis in left face.A no pain lump of 3.5 cm×4.0 cm with clear boundary was palpable in the left parotoid gland and no motion. Blood and urine routine test, X-ray of chest, electrocardiogram(ECG) were done.Ultrasonography showed that there was a cystic lump of 2.8 cm×3.4 cm with clear boundary in her left parotoid gland.CT of parotoid gland showed that there was a lump of 2.8 cm×2.3 cm with clear boundary and uneven density in left parotoid gland.While, contrast meium enhancement CT scaning shown that the density is slight uneven enhancement.The lesion of the main facial nerve trunk was visualized and dissected intraoperatively and was diagnosed as Schwannoma of facial nerve by pathology postoperatively.