Submucosal dermoid cyst of the rectum: report of a case

Primary Mature Teratoma of the Rectum: A Case Report

Patient: Female, 68-year-old

Final Diagnosis: Primary mature teratoma of the rectum

Symptoms: Hematochezia

Medication:—

Clinical Procedure: Colonoscopy with polypectomy

Specialty: Gastroenterology and Hepatology

Primary cystic peritoneal masses and mimickers: spectrum of diseases with pathologic correlation

Cystic lesions within the peritoneum have been classified classically according to their lining on histology into four categories-endothelial, epithelial, mesothelial, and others (germ cell tumors, sex cord gonadal stromal tumors, cystic mesenchymal tumors, fibrous wall tumors, and infectious cystic peritoneal lesions). In this article, we will proceed to classify cystic peritoneal lesions focusing on the degree of radiological complexity into three categories-simple cystic, mildly complex, and cystic with solid component lesions. Many intra-abdominal collections within the peritoneal cavity such as abscess, seroma, biloma, urinoma, or lymphocele may mimic primary peritoneal cystic masses and need to be differentiated. Clinical history and imaging features may help differentiate intra-abdominal collections from primary peritoneal masses. Lymphangiomas are benign multilocular cystic masses that can virtually occur in any location within the abdomen and insinuate between structures. Ultrasound may help differentiate enteric duplication cysts from other mesenteric and omental cysts in the abdomen. Double-layered wall along the mesenteric side of bowel may suggest its diagnosis in the proper clinical setting. Characteristic imaging features of hydatid cysts are internal daughter cysts, floating membranes and matrix, peripheral calcifications, and collagenous pericyst. Non-pancreatic psuedocysts usually have a fibrotic thick wall and chylous content may lead to a fat-fluid level. Pseudomyxoma peritonei appears as loculated fluid collections in the peritoneal cavity, omentum, and mesentery and may scallop visceral surfaces. Many of the primary cystic peritoneal masses have specific imaging features which can help in accurate diagnosis and management of these entities. Knowledge of the imaging spectrum of cystic peritoneal masses is necessary to distinguish from other potential cystic abdominal mimicker masses.

A rare case of primary solid intrarectal dermoid

Primary rectal teratomas are rare and only few cases have been reported in the literature worldwide. These usually occur in females. These are usually cystic but very rarely solid variants may occur. We present a case of a solid intra-rectal dermoid arising primarily in rectum from postero-lateral wall. Excision biopsy was done per rectally. Histology revealed the presence of squamous epithelium, fat cells, hair follicles, cartilaginous material and columnar lining of glandular structures suggestive of mature teratoma. It is usually benign but may become malignant, therefore complete resection is advised.

Mature solid teratoma of the rectum: report of a case

A case of an unusual occurrence of mature solid teratoma of the rectum is reported with a review of the literature. A 30-year-old woman presented with bleeding per anum without any alteration in her bowel habits. Sigmoidoscopy revealed a pedunculated polypoidal mass arising from the posterior wall of the rectum. A polypectomy specimen on microscopy showed the components of all the three germ layers. This may be the largest polypoidal type of rectal teratoma reported in the English literature to date. A review of the literature indicated only 50 previously reported cases, with all except one being female. The common presentations include prolapse and bleeding per anum.

A case of ovarian mature cystic teratoma presenting as a pedunculated ileal tumor

We report on a 34-year-old Japanese woman who presented with a pedunculated ileal tumor and who was finally diagnosed as having a right ovarian mature cystic teratoma penetrating and protruding into the ileum. She had undergone laparoscopic left ovarian cystectomy, whose specimen was diagnosed as dermoid cyst when she was 27 years old. The colon fiberscope revealed an ileal polyp, diagnosed as mature teratoma. Because of adhesion to the necrotic nodule between the tumor and the right ovary, ileocecal resection and right ovarian cystectomy were performed. The ileal tumor contained tissues of skin, neuroglia, ganglion, choroid, retina, smooth muscle, as well as fibrous and adipose tissues, cartilage, bone, mucous epithelium, and bronchial structures with bronchial glands. The necrotic nodule showed abscess, granulation tissue, foreign body reaction, hairs, normal ileal epithelium, and the ovary with ovums.

Epidermal (infundibular) and dermoid cysts in the dorsal midline of a three-year-old thoroughbred-cross gelding

Epidermal (infundibular) and dermoid cysts are unusual in the horse in contrast with other species. The diagnosis and treatment of six lesions in the dorsal midline of a three-year-old Thoroughbred-cross gelding is described. The lesions were believed to be congenital and presented asymptomatically but required attention because five of them were in the saddle region, thus preventing ridden exercise. Under general anaesthesia, the cysts were excised and subsequently examined histologically. The horse recovered uneventfully. This report is novel in that such midline cysts have not previously been described outside Australia and North America.