A rare case of epidermoid cyst of perineum: Diffusion-weighted MRI and ultrasonography findings

Abstract

In the differential diagnosis of perineal cystic lesions, a wide range of lesions can be considered, but perineal epidermoid cyst is rare. We present a case of perineal epidermoid cyst, a man with a complaint of painless perianal mass who appeared at the general surgery clinic. Ultrasonographic and conventional magnetic resonance imaging (MRI) findings are noted along with the diffusion-weighted MRI findings. To our knowledge, there has been no specific study in the literature up to now focusing on the value of diffusion-weighted MRI findings in the differential diagnosis of perineal cystic lesions; this technique may be useful.

Epidermoid cyst of perineum: a rare case in a young female

“…They occur as a result of proliferation of epidermal cells within the dermis, are lined by stratified squamous epithelium and filled with keratin. 1 Epidermoid cysts do not usually cause symptoms but can cause discomfort due to their size or if they become infected.…”

“…The differential diagnosis of a cystic lesion in the perineum includes abscess, pilonidal cyst, anal duct/gland cysts, tail gut cyst, benign teratomas and anal/skin cancer. 1 …”

“…They represent most common cutaneous cysts and are usually asymptomatic; however, they may become secondarily inflamed or infected, or rarely develop malignancy. 1 – 3 They occur twice as commonly in males compared to in females 1 , 2 and can occur at any age, but are most commonly seen in the third and fourth decades of life. 1 Epidermoid cysts are typically small, solitary and slow-growing lesions.…”

“… 1 – 3 They occur twice as commonly in males compared to in females 1 , 2 and can occur at any age, but are most commonly seen in the third and fourth decades of life. 1 Epidermoid cysts are typically small, solitary and slow-growing lesions. While they are located commonly on the face, neck and trunk, uncommon and rare sites of occurrence include perineum, extremities, bones and breast.…”

“…While they are located commonly on the face, neck and trunk, uncommon and rare sites of occurrence include perineum, extremities, bones and breast. 1 , 3 …”