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Retroperitoneal lymphangiomas are uncommon lymphatic malformations that present as cystic masses, arise from isolated lymphatic vessels, and do not communicate with the normal lymphatic system. We report a rare case of retroperitoneal lymphangioma in a young man who presented with abdominal pain and diarrhea. The patient was successfully treated with tumor resection, and lymphangioma was confirmed by histopathological analysis. In addition to describing this case, we present a review of the clinical manifestations, pathological findings, radiological findings, and treatments associated with retroperitoneal lymphangioma.

Mature cystic teratoma is one of the most common tumors of the ovaries, testis, mediastinum, and retroperitoneum; however, secondary retroperitoneum lesions are rare entities in adults. We report a case of a 22-year-old female who was previously diagnosed with a mature teratoma of left ovarian was hospitalized due to dull abdominal pain in right hypochondria. Radiological evaluation revealed a mass in the right upper abdominal and flank region with an extension from the posterior aspect of the duodenum, composed of greasy and cystic elements. A tumor was resected through the Kocher's laparotomy and the pathology report confirmed the diagnosis of a mature cystic teratoma with no evidence of malignancy or immature components. Keywords: Secondary retroperitoneal teratoma, Mature cystic teratoma

Highlights • The term “sebaceous cyst” has fallen into disuse, the current term is an epidermoid cyst. • Other common synonyms include infundibular cyst, epidermal cyst, epidermal inclusion cyst, and epidermoid inclusion cyst. • These cysts are slow-growing masses that elevate the skin and often have a central punctum. • On radiology, they have round to oval structure, well-circumscribed, avascular mass; restricted diffusion is typical. • Removal may be accomplished by simple excision or incision., Epidermoid cysts are slow-growing, painless masses that elevate the skin and often have a central punctum that represents the plugged orifice of the pilosebaceous follicle. On ultrasound, they have a round to oval structure, well-circumscribed, avascular mass located in subcutaneous tissue along with phenomena of dorsal acoustic amplification and lateral shadowing. On MRI, they have slightly hypointense signal intensity on T1-weighted and intermediate to high signal on T2-weighted. Restricted diffusion is typical of epidermoid cysts. These signs are useful in the differentiation of epidermal cysts from neoplastic lesions. They need early treatment as they can cause cosmetic and functional impairment.

Odontomas are one type of benign odontogenic hamartoma that includes the compound and complex odontoma. They are generally reported not to exceed 3 cm in diameter. Odontomas with a diameter exceeding 3 cm are considered giant odontomas. An accurate diagnosis of odontomas cannot be made during the clinical examination. The majority of compound odontoma is diagnosed most commonly during radiographic screening. It should be done in coordination with a histological examination after surgical treatment. We report a case of giant compound odontoma of the mandible in a young boy. The tumor is treated by surgical excision under general anesthesia.