Odontogenic keratocyst is a benign intraosseous lesion of odontogenic origin which is characterized by its aggressive nature. It is usually present in the mandibular posterior area, although it can also be found in the maxilla, particularly in the canine region. We discuss a unique example of OKC in the maxillary sinus involving the 27&28 region. Due to comparable clinical signs, this lesion is more prone to be mistaken for other lesions of the maxillary sinus, such as sinusitis or polyps. On the other side, this benign disease has the potential to develop into Ameloblastoma or squamous cell carcinoma. A favorable prognosis thus depends on early identification, precise diagnosis, appropriate treatment, and follow-ups.

A radicular cyst, also known as a periapical cyst or root end cyst, is usually associated with permanent dentition and its association with deciduous teeth is an infrequent phenomenon. Radicular cyst typically arises from inflammation of the pulp and periapical tissues of a non-vital tooth. This article presents a case report of a six-year-old female with an apical periodontal cyst associated with deciduous and permanent teeth in the maxillary posterior region of the jaw. Early diagnosis of the lesion might have resulted in a conservative treatment plan. This text\'s purpose is to emphasize the pedodontist\'s role in the early analysis of such lesions.

Lacrimal gland stone(s) (LGSs) are rare and usually asymptomatic. LGSs should be distinguished from dacryoliths, as the former arise in the lacrimal gland. The aetiology of LGSs in many cases is likely related to a reaction to a hair within the palpebral lobe of lacrimal gland. Eye rubbing may contribute to the migration of the hair into the lacrimal gland. This case report describes the rare occurrence of an LGS with a central hair shaft (cilium) and associated sinus formation in a 39-year-old male presenting with persistent redness of, and discharge from the right eye for 4 weeks. Examination revealed a sinus opening onto the inferonasal surface of the palpebral lobe of the right lacrimal gland. The patient was treated with surgical excision of the sinus, with rapid and complete resolution of his symptoms.

BACKGROUND: Alveolar soft-part sarcoma (ASPS) is a rare malignant sarcoma with only a few cases reported in the sinus and head and neck region. It shows strong female predominance. Hormone-dependent recurrence was never reported.
METHODS: A 35 year-old woman presented nasal cavity ASPS during her first pregnancy, middle-ear ASPS during the second, and a third ASPS in the sinus outside of any peripartum period, with unfavorable progression and metastasis, terminating in death.
CONCLUSIONS: Pathology analysis of the tumors showed positive immunolabeling for progesterone receptors in the two peripartum episodes. This was thus the first report of peripartum recurrence of ASPS with strong progesterone sensitivity, reinforcing the suspected biological link between ASPS and progesterone. This case report may be a preliminary finding suggesting progesterone blockers as a novel treatment for recurrent ASPS.

Epithelioid hemangioendothelioma (EHE) is a rare condition arising from endothelial cells of the blood vessels. This is a vascular tumor that may occur anywhere throughout the body. This tumor behaves on a spectrum as either a benign tumor or an aggressive sarcoma. The EHE tumor and its management depend on the location of the lesion and accessibility for surgical excision. This case is a rare example of a patient presenting with a maxillary aggressive EHE tumor. This lesion was incidentally found on head CT done for ruling out fractures of the mid-face with incidental findings of an asymptomatic destructive lytic lesion. The treatment of this tumor located in a vital region of the mid-face will be discussed.

Urachal sinus is a rare type of urachal abnormality. It happens because of blind focal dilation at the umbilical end and has increased risk of infection. We report the case of a 23-year-old female with abdominal pain and umbilical discharge. Ultrasound detected a possible infected urachal sinus which was initially treated with antibiotic therapy. Urachal sinus excision and laparoscopic bladder raffia was later performed with no recurrence at present. Diagnosis of this pathology is essential given that surgery is curative and avoids complications such as neoplastic transformation.

Dyke-Davidoff-Masson syndrome (DDMS) is a rare condition that usually presents in early life with recurrent seizures. It can be congenital or can be acquired by perinatal hypoxia, infections, and intracranial hemorrhage. Its frequency remains unknown. It is usually diagnosed by neuroimaging. The classical neuroimaging features are unilateral cerebral hemiatrophy, volume loss, and hyperpneumatization of the sinus. We present the case of a 22-year-old male who presented with complex partial status epilepticus and had a history of recurrent seizures since he was six years old. The diagnosis of DDMS was made on neuroimaging.

Sinonasal leiomyosarcoma (LMS) is a rare and aggressive mesenchymal tumor with smooth muscle differentiation. The sinonasal tract is an unusual primary site for LMS, as scant smooth muscle exists in this location, with only 75 cases reported in the English literature including the case presented herein. Sinonasal LMS is considered an aggressive head and neck tumor with significant potential for recurrence and metastasis. Since recurrence is high and the potential for late metastasis exists, lifelong follow-up in these patients would be beneficial, especially among those with previous history of RB.

The term cholesteatoma refers to \"chole\": cholesterol, \"steat\": fat and \"oma,\": \"tumor\". This tumor has been reported to be the most common in the middle ear. The occurrence of such a tumor in the maxillary sinus is deemed to be very rare and hardly 4 cases were reported in India and 26 cases described worldwide. This case report intends to discuss the uniqueness and indolent nature of this lesion in terms of histopathology and radiography.

Hidradenitis suppurativa is a chronic, recurrent follicular-based inflammatory condition classically occurring in apocrine-rich areas; commonly affected areas include the anogenital, axillary, inframammary, and inguinal regions. Infrequently, hidradenitis suppurativa can occur in locations where apocrine glands are scant or absent; in this setting, it has been referred to as ectopic hidradenitis suppurativa. The case of a 59-year-old man with ectopic hidradenitis suppurativa on his right posterior thigh is described. The postulated pathogenesis, treatment modalities, and various reported locations of ectopic hidradenitis suppurativa are reviewed.