A case of acinic cell carcinoma originated in the submandibular gland of aged patient.

Imaging features of acinic cell carcinoma: three case reports and a review of the literature

“…Although various shapes and sizes were reported, these findings were not specific to this tumor. [28][29][30][34][35][36][37][38][39][40] Well-circumscribed boundaries were more frequently observed than poorly circumscribed boundaries, both in the Max sinus, maxillary sinus; CLN, metastasis of cervical lymph node; PALN, metastasis of preauricular lymph node; PPS, protrusion to parapharyngeal space; subcut fat, invasion to subcutaneous fat; skin, invasion to skin; homo, homogeneous enhancement; hetero, heterogeneous enhancement; (N.D.), not described extracellular space has increased. Furthermore, in the "chronic" stage, the deposition of hemosiderin is indicated by very low signal intensity on both T1-and T2-weighted images, present for several years.…”

“…2A present cases and in those from the literature. [28][29][30][31][34][35][36][37][38][39][40][41] Although the tumor in Case 2 in the present study showed a clear boundary on images, it had invaded the salivary duct. WHO has indicated that some tumors may appear to be encapsulated, but when the tumor is viewed microscopically it is usually found to be incomplete.…”

“…[28][29][30][31][34][35][36][37][38][39][40][41] Tables 4 and 5 show imaging and clinicopathologic features of ACC. Tumors showed various shapes, such as round, oval, or lobulated, and their sizes ranged from 5 to 60 mm.…”

“…[28][29][30]39 Some tumors appear homogeneous, while others appear heterogeneous. [28][29][30][31][34][35][36][37][38][39][40][41] Histologically, ACC show multiple patterns of growth, with the most common patterns being solid and microcystic. 5 In the present study and in the literature, homogeneity hardly seemed related to these histological growth patterns, although it may be related to the presence of cysts or hemorrhage.…”

“…11,30,44 Tumors with hemorrhage often appear heterogeneous on CT images, and this can be demonstrated even more clearly on MR images. 30,35,[37][38] The MRI appearance of hemorrhage is complex and depends on the amounts of different hemorrhage products and the abundance of vessels. 30,37,[45][46] Hemorrhage in the "earliest" stage is identified as overall hyperintensity accompanied by marked peripheral hypointensity on T2-weighted images because of relatively oxygenated hemoglobin accompanied by deoxygenation peripherally.…”