Characteristics of diffusion-weighted images and apparent diffusion coefficients of ranulas and other masses in and around the floor of the mouth

Publication date: Available online 9 September 2018

Source: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology

Author(s): Nao Wakasugi-Sato, Manabu Habu DDS, Masafumi Oda, Tatsurou Tanaka, Ikuko Nishida, Tetsuro Wakasugi, Shinya Kokuryo, Daigo Yoshiga, Teppei Sago, Nozomu Harano, Shinji Kito, Shinobu Matsumoto-Takeda, Takaaki Jyoujima, Yuichi Miyamura, Naomi Yada, Masaaki Sasaguri, Yasuhiro Morimoto

Structured abstract

Objective

To evaluate the characteristics of diffusion-weighted imaging (DWI) and apparent diffusion coefficient (ADC) values of ranulas. In addition, to elucidate DWI findings and ADC values of other representative masses in and around the floor of the mouth.

Methods

DWI findings and ADC values of 35 patients with ranulas and 33 patients with other masses were retrospectively reviewed with a central focus on cystic masses or lesions that may have cyst-like components in and around the floor of the mouth based on the diagnosis of each respective disease.

Results

Ranulas were all well-defined, homogeneous masses with high signal intensity on DWI. The mean±standard deviation ADC value of the 35 ranulas was 2.59±0.31 × 10⁻³ mm²/s. There was a significant difference in ADC values between simple and plunging ranulas. On DWI, most other masses were heterogeneous, and most ADC values, except for thyroglossal duct cysts, hemangiomas, and pleomorphic adenomas, were significantly lower than those for ranulas.

Conclusions

The characteristic DWI and ADC findings of ranulas could be accurately recognized, and these data should be very useful in the differential diagnosis of many kinds of diseases in and around the oral floor.

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