A small tumor or fluid collection at the connection of any tendon is called a

• A. Ganglion cyst
• B. Lipoma
• C. Abscess
• D. Hematoma

Answer: (A)

A ganglion cyst is a small, fluid-filled lesion that arises from the joint capsule or tendon sheath, often at the point where a tendon meets its sheath. This makes it the classic description for a tiny fluid collection near a tendon junction. On ultrasound, it typically appears as a well-defined, anechoic to hypoechoic structure with posterior acoustic enhancement and may be unilocular or multilocular, sometimes with a narrow neck connecting to the joint or sheath. The fluid is usually mucinous and gelatinous, and the lesion is often compressible and noninvasive to the surrounding tendon. In contrast, a lipoma is a fatty, usually more echogenic mass; an abscess is a pus-filled collection often with internal echoes and surrounding inflammatory changes; a hematoma is a blood collection whose appearance varies with age and trauma history. Thus, the description best matches a ganglion cyst.