Navigating adult pineal tumours can be complex, but by reading this article, you can make informed decisions about your treatment options. The article answers essential questions with reference to the chosen topic. Read with confidence until the end and access the references for more information.

Adult pineal tumours often require careful consideration of treatment options, as they can vary widely in their characteristics and prognosis, making personalised care essential. This article captures the essential aspects to be aware of.

Get more in-depth information about pineal tumours in adults by continuing to read and be curious about what the experts bring to the table. 

Anatomy and physiology

Pineal gland

The pineal gland is a gland in our brain. It is located deep in the middle of our brain, beneath the back part of the corpus callosum. The pineal gland is composed of pineocytes, principal cells which are specialized neurosecretory cells. Its main purpose is to produce melatonin and release it into the blood. ¹

The melatonin hormone, mainly produced by your pineal gland, helps to synchronize circadian rhythms in different parts of our body. The higher secretion of melatonin is when there is darkness and decreases with exposure to light.  Research has shown that melatonin regulates the menstrual cycles, and protects against progressive loss of function of neurons.  The main function of the pineal gland is to adjust the secretion of melatonin according to the light-dark or day-night cycle.

Pineal tumour s

The majority of pineal parenchymal tumours develop in adults, with a slight tendency towards females. These tumours usually exhibit neuronal, neuroendocrine, and/or neurosensory characteristics.

Pineal gland tumours are very rare and they are not always cancerous. The problem with pineal tumours is that they grow and press against other parts of the brain, blocking the normal flow of cerebrospinal fluid, the fluid that surrounds and cushions our brain, raising the pressure inside the skull.

According to the World Health Organization (WHO) 2021 classification, tumours of the pineal region (PRT) are rare and represent a histologically heterogeneous group of tumours, including:

• Primary pineal parenchymal tumours
• Germ cell tumours (GCT)
• Tumours originating from the adjacent structures

A recent study shows a detailed description of the main features of different types of pineal gland tumours, including their histological subtypes, how they look under a microscope, how common they are, and who they usually affect in terms of age and gender.²

There is a grading system for brain tumours grouped by grades from grade I (the slowest growing) to grade IV (the most aggressive and grows and spreads faster). 

For the pineal gland, there are five differences between tumours: 

1. Pineocytoma: These tumours grow slowly and are usually found in individuals aged 20 to 64, although they can occur at any age. Patients with pineocytomas typically have a positive prognosis.
2. Pineal parenchymal tumour: These tumours are of intermediate grade and can occur at any age. Similarly, papillary pineal tumours fall into this category.
3. Papillary pineal tumour: Like pineal parenchymal tumours, these are of intermediate grade.
4. Pineoblastoma: These tumours are extremely rare, aggressive, and fast-growing. They are almost always cancerous and predominantly affect individuals under 20 years old.
5. Mixed pineal tumour: These tumours contain a mix of slow- and fast-growing cell types.

Causes

Although the precise origin of pineal tumours remains elusive, a thorough investigation has elucidated numerous factors that might play a role in their formation.

Genes and the environment, in some cases, exposure to radiation or gene problems may play a role in what causes pineal tumours, but researchers do not know exactly.

It is essential to emphasise that although these factors have been linked to a higher likelihood of developing pineal tumours, they do not necessarily guarantee their onset. Many people who have no identified risk factors still develop these tumours, underscoring the multifaceted aspects of this condition.

Understanding the risk factors linked to pineal tumours is vital for early detection and prevention strategies.³

Signs and symptoms

Symptoms typically arise due to obstruction of the flow of cerebrospinal fluid.

Common signs:

1. headache
2. nausea and vomiting
3. vision changes
4. trouble with eye movements
5. tiredness
6. memory problems
7. balance or coordination problems. 

Consulting a healthcare provider for an accurate diagnosis is essential as symptoms of a pineal tumour can mimic those of other health issues.¹

Common symptoms:

1. Headaches (common) 
2. Nausea and vomiting 
3. Vision changes 
4. Trouble with eye movements 
5. Tiredness 
6. Memory problems  
7. Balance or coordination problems

Diagnostic

The identification of tumours in the pineal region relies on symptoms observed during clinical examination, imaging tests, and analysis of tissue samples.³ 

Initially, individuals may consult with their primary care provider, who may subsequently refer them to a specialist in neurological disorders, such as a neurologist, neurosurgeon, or neuro-oncologist.

If a pineal tumour  is suspected, diagnostic procedures may include:

1. Magnetic resonance imaging (MRI): Utilised to produce detailed images of the brain and spinal cord using radio waves and magnetic fields.
2. Tissue biopsy: This involves extracting samples from the tumour for laboratory analysis to determine its type and grade.
3. Lumbar puncture (spinal tap): This procedure entails inserting a thin needle between the vertebrae to withdraw a small amount of cerebrospinal fluid (CSF), which is then examined for tumour cells and other substances.
4. Blood tests: Used to evaluate levels of specific substances, such as melatonin, in the blood.

Neuroimaging, including both computerized tomography (CT) and magnetic resonance imaging (MRI), plays a crucial role in the diagnosis and post-surgical monitoring of lesions. It is integral to accurately characterising histological lesions and guiding treatment decisions. Additionally, radiotherapy continues to be a vital part of the comprehensive treatment strategy.

Treatment

Treatment is not standardised due to the low incidence of these tumours, the different histological types, and the small number of studies reported in the literature, but treatment options range from biopsy and surgery to radiotherapy and chemotherapy. ²  

To see another doctor to get a second opinion If diagnosed with a pineal tumour may help to have a better understanding of the treatment options and feel good about the treatment choices. 

Pineal tumours may be hard to remove with surgery but in some cases, doctors use a computer to help them focus high-powered radiation, called stereotactic radiosurgery, with no cutting involved.

After treatment, regular follow-up MRI scans are needed, to watch for signs that the tumour has come back.

Inquire about alternative treatment options, as the management of pineal tumours is contingent upon various factors including tumour size, location, type, and grade, as well as whether the tumour is exerting pressure on the brain or has metastasised to the central nervous system.

The pineal gland, situated within the brain's ventricular system, is responsible for synthesising and releasing melatonin, a hormone pivotal in circadian rhythm regulation. Pineal region tumours, albeit rare, encompass a spectrum of histological variants such as pineocytoma and pineal parenchymal tumours, exhibiting diverse demographic predispositions. Accurate diagnosis poses a challenge due to symptom overlap with other pathologies, necessitating comprehensive evaluation through modalities like MRI, biopsy, and lumbar puncture. Treatment modalities, ranging from surgical excision to radiotherapy, are contingent upon tumour subtype and grade. Long-term surveillance is imperative to detect any recurrence post-treatment. Seeking a secondary medical opinion can facilitate informed decision-making regarding therapeutic interventions.

FAQs

What happens if you have a tumour on your pineal gland? 

A pineal gland tumour can raise the pressure inside the head by blocking cerebrospinal fluid flow, requiring treatment such as surgery, radiation, or chemotherapy.

How long can you live with a pineal tumour? 

Survival rates for pineal tumours vary, but generally, about 75.5% of patients survive for five years after diagnosis, influenced by factors like tumour grade, age, and treatment response.

What does a pineal tumour feel like? 

A pineal tumour can cause symptoms like headaches, nausea, vomiting, memory problems, and imbalance by blocking the flow of cerebrospinal fluid, leading to increased pressure in the brain known as hydrocephalus.

Can pineal tumour be cured?

Yes, benign pineal tumours can often be cured with complete removal, while malignant tumours may require partial removal due to risks to surrounding tissue.

Summary

The article provides a comprehensive overview of adult pineal tumours, emphasizing the importance of personalized treatment due to the varied nature and prognosis of these tumours. It covers essential aspects including anatomy, types of tumours, potential causes, symptoms, diagnostic methods, and treatment options such as surgery, radiotherapy, and chemotherapy. Long-term monitoring post-treatment is crucial. The information aims to empower patients with knowledge to make informed decisions about managing their condition.