A pear-shaped and well-circumscribed radiolucent lesion with a corticated outline was found on a radiograph related to the root of an upper central incisor. The tooth was not restored and proved vital on testing.

A nasopalatine duct cyst is a specific type of cyst that develops from remnants of the nasopalatine duct. During embryonic development, this duct is involved in the formation of the nasal and oral cavities. Sometimes, remnants of this duct can persist and give rise to a cystic lesion later in life.

The nasopalatine duct extends from a structure called the incisive canal, which is located in the midline of the maxillary bone (the bone that comprises the upper jaw). The cyst can develop anywhere along this tract.

When we examine the lining of a nasopalatine duct cyst under a microscope, we typically observe the presence of both respiratory and squamous epithelium. This finding is significant because it indicates the origin of the cyst from the nasopalatine duct. The respiratory epithelium represents the lining of the nasal portion of the duct, while the squamous epithelium represents the lining of the oral portion.

Furthermore, a nasopalatine duct cyst often contains a neurovascular bundle within its capsule. This bundle consists of nerve fibers and blood vessels that supply the nasopalatine area. Its presence within the cyst is a characteristic feature.

In clinical practice, nasopalatine duct cysts are usually asymptomatic and are often discovered incidentally during routine dental examinations. However, if the cyst becomes large or infected, it can cause pain, swelling, and discomfort in the affected area.

As a dental student, it’s important to be familiar with the clinical presentation, radiographic appearance, and management of nasopalatine duct cysts. Treatment typically involves surgical removal of the cyst to relieve symptoms and prevent potential complications.

A 26-year-old African patient presented with a rapidly growing lesion that expanded the mandible. There was bone destruction on the radiograph and therefore malignancy was suspected. On biopsy, the lesion was intraosseous and was cavitated. There was profuse bleeding and a small biopsy of the lining was taken. The pathologist reported osteoclast-like giant cells and granulation tissue with blood clots.

An aneurysmal bone cyst is a type of benign bone tumor that can occur in the jawbone. It is called an “aneurysmal” because it contains blood-filled spaces that can resemble the sac-like structure of an aneurysm. These cysts are relatively rare, accounting for less than 1% of all bone tumors.

Clinically, an aneurysmal bone cyst can be dramatic because it can grow rapidly and attain a large size. This can cause symptoms such as pain, swelling, and displacement of nearby teeth. When a biopsy is performed to confirm the diagnosis, bleeding can be profuse due to the presence of fragile blood vessels within the cyst. In some cases, a blood transfusion may be necessary to manage the bleeding.

It is important to note that aneurysmal bone cysts often form around an underlying primary lesion, such as a vascular malformation or bone tumor. Therefore, it is crucial to thoroughly evaluate any aneurysmal bone cyst to determine if there is an underlying primary lesion that needs to be addressed. Treatment options for aneurysmal bone cysts may include surgical excision or minimally invasive procedures such as sclerotherapy or curettage.

As a dental student, it is important to be aware of aneurysmal bone cysts as a potential differential diagnosis when evaluating patients with jaw pain, swelling, or other symptoms. If you suspect a patient may have an aneurysmal bone cyst, referring them to an oral and maxillofacial surgeon for further evaluation and management is important.

A 22-year-old man attended for treatment. He had a history of Gardnerʼs syndrome and noticed a bony hard lump on the ascending ramus of the mandible.

Gardner’s syndrome, also known as familial adenomatous polyposis (FAP), is a rare genetic disorder that affects the colon and rectum. It is caused by mutations in the APC gene and is inherited in an autosomal dominant pattern.

Individuals with Gardner’s syndrome develop numerous polyps in the colon and rectum, which can eventually lead to colorectal cancer if left untreated. Additionally, they may also develop polyps in the stomach and small intestine. The condition is typically diagnosed in the teenage years or early adulthood.

Gardner’s syndrome can also cause abnormalities in the jaw, including multiple osteomas, odontomas, and areas of hazy sclerosis. These dental findings may be one of the earliest signs of the condition and can help with early diagnosis.

A 58-year-old man presented with a brown–red granular epulis. A periapical radiograph showed underlying bone destruction and a biopsy was reported as showing osteoclast-like giant cells in a spindle-cell background with numerous thin- walled vessels. Haemosiderin and extravasated red cells were abundant.

The clinical and radiographic findings suggest that the 58-year-old man may have a peripheral giant-cell granuloma (PGCG). This is a benign, non-cancerous tumor that often arises from the gum tissue and can cause bone destruction in the underlying jawbone.

The biopsy findings support the diagnosis of PGCG, as the presence of osteoclast-like giant cells and spindle cells in a background of abundant thin-walled vessels is characteristic of this condition. The haemosiderin and extravasated red cells seen in the biopsy are likely a result of bleeding within the lesion, which is common in PGCG.

These same features may also be observed in hyperparathyroidism. However, in hyperparathyroidism, serum calcium levels are typically elevated, while this is not the case in giant-cell granuloma. Therefore, measuring serum calcium levels can be a useful diagnostic tool in differentiating between these two conditions, especially when giant-cell granuloma features are observed.

Treatment for PGCG typically involves surgical removal of the lesion, along with the underlying affected bone. Recurrence is possible, so close follow-up and monitoring is important.